diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..ccaf1a6
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,16 @@
+{
+  "env": { "node": true, "jest": true },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": { "ecmaVersion": 2020, "sourceType": "module" },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "plugin:import/typescript",
+    "plugin:prettier/recommended",
+    "prettier/@typescript-eslint"
+  ],
+  "plugins": ["@typescript-eslint", "jest"]
+}
diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 59bb21f..b31fdc1 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -1,6 +1,11 @@
 name: Tests
+
 on:
   pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - '**.md'
   push:
     branches:
       - master
@@ -10,22 +15,39 @@ on:
 jobs:
   test:
     name: Test on ${{ matrix.os }}
+
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
+
     runs-on: ${{ matrix.os }}
-    
+
     steps:
     - uses: actions/checkout@v1
-      
+
     - uses: actions/setup-node@v1
       with:
         node-version: '12.x'
 
+    - name: Get npm cache directory
+      id: npm-cache
+      run: |
+        echo "::set-output name=dir::$(npm config get cache)"
+
+    - uses: actions/cache@v1
+      with:
+        path: ${{ steps.npm-cache.outputs.dir }}
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+
     - run: npm ci
 
     - name: Prettier Format Check
       run: npm run format-check
 
+    - name: ESLint Check
+      run: npm run lint
+
     - name: Build & Test
       run: npm run test
diff --git a/README.md b/README.md
index e65cea6..210c51d 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Create a workflow `.yml` file in your repositories `.github/workflows` directory
 ### Example workflow
 
 ```yaml
-name: Example Caching with npm
+name: Caching Primes
 
 on: push
 
@@ -39,22 +39,19 @@ jobs:
     steps:
     - uses: actions/checkout@v1
 
-    - name: Cache node modules
+    - name: Cache Primes
+      id: cache-primes
       uses: actions/cache@v1
       with:
-        path: node_modules
-        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-        restore-keys: |
-          ${{ runner.os }}-node-
+        path: prime-numbers
+        key: ${{ runner.os }}-primes
 
-    - name: Install Dependencies
-      run: npm install
+    - name: Generate Prime Numbers
+      if: steps.cache-primes.outputs.cache-hit != 'true'
+      run: /generate-primes.sh -d prime-numbers
     
-    - name: Build
-      run: npm run build
-
-    - name: Test
-      run: npm run test
+    - name: Use Prime Numbers
+      run: /primes.sh -d prime-numbers
 ```
 
 ## Ecosystem Examples
@@ -78,7 +75,7 @@ steps:
     id: cache
     with:
       path: path/to/dependencies
-      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles')}}
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
   
   - name: Install Dependencies
     if: steps.cache.outputs.cache-hit != 'true'
diff --git a/__tests__/__fixtures__/helloWorld.txt b/__tests__/__fixtures__/helloWorld.txt
new file mode 100644
index 0000000..95d09f2
--- /dev/null
+++ b/__tests__/__fixtures__/helloWorld.txt
@@ -0,0 +1 @@
+hello world
\ No newline at end of file
diff --git a/__tests__/actionUtils.test.ts b/__tests__/actionUtils.test.ts
new file mode 100644
index 0000000..4688b5d
--- /dev/null
+++ b/__tests__/actionUtils.test.ts
@@ -0,0 +1,226 @@
+import * as core from "@actions/core";
+import * as os from "os";
+import * as path from "path";
+
+import { Events, Outputs, State } from "../src/constants";
+import { ArtifactCacheEntry } from "../src/contracts";
+import * as actionUtils from "../src/utils/actionUtils";
+
+jest.mock("@actions/core");
+jest.mock("os");
+
+afterEach(() => {
+    delete process.env[Events.Key];
+});
+
+test("getArchiveFileSize returns file size", () => {
+    const filePath = path.join(__dirname, "__fixtures__", "helloWorld.txt");
+
+    const size = actionUtils.getArchiveFileSize(filePath);
+
+    expect(size).toBe(11);
+});
+
+test("isExactKeyMatch with undefined cache entry returns false", () => {
+    const key = "linux-rust";
+    const cacheEntry = undefined;
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+});
+
+test("isExactKeyMatch with empty cache entry returns false", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {};
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+});
+
+test("isExactKeyMatch with different keys returns false", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "linux-"
+    };
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+});
+
+test("isExactKeyMatch with different key accents returns false", () => {
+    const key = "linux-áccent";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "linux-accent"
+    };
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+});
+
+test("isExactKeyMatch with same key returns true", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "linux-rust"
+    };
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(true);
+});
+
+test("isExactKeyMatch with same key and different casing returns true", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "LINUX-RUST"
+    };
+
+    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(true);
+});
+
+test("setOutputAndState with undefined entry to set cache-hit output", () => {
+    const key = "linux-rust";
+    const cacheEntry = undefined;
+
+    const setOutputMock = jest.spyOn(core, "setOutput");
+    const saveStateMock = jest.spyOn(core, "saveState");
+
+    actionUtils.setOutputAndState(key, cacheEntry);
+
+    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "false");
+    expect(setOutputMock).toHaveBeenCalledTimes(1);
+
+    expect(saveStateMock).toHaveBeenCalledTimes(0);
+});
+
+test("setOutputAndState with exact match to set cache-hit output and state", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "linux-rust"
+    };
+
+    const setOutputMock = jest.spyOn(core, "setOutput");
+    const saveStateMock = jest.spyOn(core, "saveState");
+
+    actionUtils.setOutputAndState(key, cacheEntry);
+
+    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "true");
+    expect(setOutputMock).toHaveBeenCalledTimes(1);
+
+    expect(saveStateMock).toHaveBeenCalledWith(
+        State.CacheResult,
+        JSON.stringify(cacheEntry)
+    );
+    expect(saveStateMock).toHaveBeenCalledTimes(1);
+});
+
+test("setOutputAndState with no exact match to set cache-hit output and state", () => {
+    const key = "linux-rust";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "linux-rust-bb828da54c148048dd17899ba9fda624811cfb43"
+    };
+
+    const setOutputMock = jest.spyOn(core, "setOutput");
+    const saveStateMock = jest.spyOn(core, "saveState");
+
+    actionUtils.setOutputAndState(key, cacheEntry);
+
+    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "false");
+    expect(setOutputMock).toHaveBeenCalledTimes(1);
+
+    expect(saveStateMock).toHaveBeenCalledWith(
+        State.CacheResult,
+        JSON.stringify(cacheEntry)
+    );
+    expect(saveStateMock).toHaveBeenCalledTimes(1);
+});
+
+test("getCacheState with no state returns undefined", () => {
+    const getStateMock = jest.spyOn(core, "getState");
+    getStateMock.mockImplementation(() => {
+        return "";
+    });
+
+    const state = actionUtils.getCacheState();
+
+    expect(state).toBe(undefined);
+
+    expect(getStateMock).toHaveBeenCalledWith(State.CacheResult);
+    expect(getStateMock).toHaveBeenCalledTimes(1);
+});
+
+test("getCacheState with valid state", () => {
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+    const getStateMock = jest.spyOn(core, "getState");
+    getStateMock.mockImplementation(() => {
+        return JSON.stringify(cacheEntry);
+    });
+
+    const state = actionUtils.getCacheState();
+
+    expect(state).toEqual(cacheEntry);
+
+    expect(getStateMock).toHaveBeenCalledWith(State.CacheResult);
+    expect(getStateMock).toHaveBeenCalledTimes(1);
+});
+
+test("isValidEvent returns false for unknown event", () => {
+    const event = "foo";
+    process.env[Events.Key] = event;
+
+    const isValidEvent = actionUtils.isValidEvent();
+
+    expect(isValidEvent).toBe(false);
+});
+
+test("resolvePath with no ~ in path", () => {
+    const filePath = ".cache/yarn";
+
+    const resolvedPath = actionUtils.resolvePath(filePath);
+
+    const expectedPath = path.resolve(filePath);
+    expect(resolvedPath).toBe(expectedPath);
+});
+
+test("resolvePath with ~ in path", () => {
+    const filePath = "~/.cache/yarn";
+
+    const homedir = jest.requireActual("os").homedir();
+    const homedirMock = jest.spyOn(os, "homedir");
+    homedirMock.mockImplementation(() => {
+        return homedir;
+    });
+
+    const resolvedPath = actionUtils.resolvePath(filePath);
+
+    const expectedPath = path.join(homedir, ".cache/yarn");
+    expect(resolvedPath).toBe(expectedPath);
+});
+
+test("resolvePath with home not found", () => {
+    const filePath = "~/.cache/yarn";
+    const homedirMock = jest.spyOn(os, "homedir");
+    homedirMock.mockImplementation(() => {
+        return "";
+    });
+
+    expect(() => actionUtils.resolvePath(filePath)).toThrow(
+        "Unable to resolve `~` to HOME"
+    );
+});
+
+test("isValidEvent returns true for push event", () => {
+    const event = Events.Push;
+    process.env[Events.Key] = event;
+
+    const isValidEvent = actionUtils.isValidEvent();
+
+    expect(isValidEvent).toBe(true);
+});
+
+test("isValidEvent returns true for pull request event", () => {
+    const event = Events.PullRequest;
+    process.env[Events.Key] = event;
+
+    const isValidEvent = actionUtils.isValidEvent();
+
+    expect(isValidEvent).toBe(true);
+});
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
deleted file mode 100644
index 074a5e7..0000000
--- a/__tests__/main.test.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import * as core from "@actions/core";
-
-import { Inputs } from "../src/constants";
-import run from "../src/restore";
-import * as testUtils from "../src/utils/testUtils";
-
-test("restore with no path", async () => {
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        "Input required and not supplied: path"
-    );
-});
-
-test("restore with no key", async () => {
-    testUtils.setInput(Inputs.Path, "node_modules");
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        "Input required and not supplied: key"
-    );
-});
diff --git a/__tests__/restore.test.ts b/__tests__/restore.test.ts
new file mode 100644
index 0000000..1919e30
--- /dev/null
+++ b/__tests__/restore.test.ts
@@ -0,0 +1,450 @@
+import * as core from "@actions/core";
+import * as exec from "@actions/exec";
+import * as io from "@actions/io";
+import * as path from "path";
+import * as cacheHttpClient from "../src/cacheHttpClient";
+import { Events, Inputs } from "../src/constants";
+import { ArtifactCacheEntry } from "../src/contracts";
+import run from "../src/restore";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("@actions/exec");
+jest.mock("@actions/io");
+jest.mock("../src/utils/actionUtils");
+jest.mock("../src/cacheHttpClient");
+
+beforeAll(() => {
+    jest.spyOn(actionUtils, "resolvePath").mockImplementation(filePath => {
+        return path.resolve(filePath);
+    });
+
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isValidEvent").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.isValidEvent();
+    });
+
+    jest.spyOn(actionUtils, "getSupportedEvents").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.getSupportedEvents();
+    });
+
+    jest.spyOn(io, "which").mockImplementation(tool => {
+        return Promise.resolve(tool);
+    });
+});
+
+beforeEach(() => {
+    process.env[Events.Key] = Events.Push;
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+});
+
+test("restore with invalid event", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+    const invalidEvent = "commit_comment";
+    process.env[Events.Key] = invalidEvent;
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        `Event Validation Error: The event type ${invalidEvent} is not supported. Only push, pull_request events are supported at this time.`
+    );
+});
+
+test("restore with no path should fail", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        "Input required and not supplied: path"
+    );
+});
+
+test("restore with no key", async () => {
+    testUtils.setInput(Inputs.Path, "node_modules");
+    const failedMock = jest.spyOn(core, "setFailed");
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        "Input required and not supplied: key"
+    );
+});
+
+test("restore with too many keys should fail", async () => {
+    const key = "node-test";
+    const restoreKeys = [...Array(20).keys()].map(x => x.toString());
+    testUtils.setInputs({
+        path: "node_modules",
+        key,
+        restoreKeys
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: Keys are limited to a maximum of 10.`
+    );
+});
+
+test("restore with large key should fail", async () => {
+    const key = "foo".repeat(512); // Over the 512 character limit
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: ${key} cannot be larger than 512 characters.`
+    );
+});
+
+test("restore with invalid key should fail", async () => {
+    const key = "comma,comma";
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    await run();
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: ${key} cannot contain commas.`
+    );
+});
+
+test("restore with no cache found", async () => {
+    const key = "node-test";
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    clientMock.mockImplementation(() => {
+        return Promise.resolve(null);
+    });
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}.`
+    );
+});
+
+test("restore with server error should fail", async () => {
+    const key = "node-test";
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    clientMock.mockImplementation(() => {
+        throw new Error("HTTP Error Occurred");
+    });
+
+    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(warningMock).toHaveBeenCalledWith("HTTP Error Occurred");
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(false);
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with restore keys and no cache found", async () => {
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: "node_modules",
+        key,
+        restoreKeys: [restoreKey]
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    clientMock.mockImplementation(() => {
+        return Promise.resolve(null);
+    });
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}, ${restoreKey}.`
+    );
+});
+
+test("restore with cache found", async () => {
+    const key = "node-test";
+    const cachePath = path.resolve("node_modules");
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: key,
+        scope: "refs/heads/master",
+        archiveLocation: "www.actionscache.test/download"
+    };
+    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    getCacheMock.mockImplementation(() => {
+        return Promise.resolve(cacheEntry);
+    });
+    const tempPath = "/foo/bar";
+
+    const createTempDirectoryMock = jest.spyOn(
+        actionUtils,
+        "createTempDirectory"
+    );
+    createTempDirectoryMock.mockImplementation(() => {
+        return Promise.resolve(tempPath);
+    });
+
+    const archivePath = path.join(tempPath, "cache.tgz");
+    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
+    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
+
+    const fileSize = 142;
+    const getArchiveFileSizeMock = jest
+        .spyOn(actionUtils, "getArchiveFileSize")
+        .mockReturnValue(fileSize);
+
+    const mkdirMock = jest.spyOn(io, "mkdirP");
+    const execMock = jest.spyOn(exec, "exec");
+    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(getCacheMock).toHaveBeenCalledWith([key]);
+    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
+    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
+    expect(downloadCacheMock).toHaveBeenCalledWith(cacheEntry, archivePath);
+    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
+    expect(mkdirMock).toHaveBeenCalledWith(cachePath);
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-xz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/")
+          ]
+        : ["-xz", "-f", archivePath, "-C", cachePath];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with a pull request event and cache found", async () => {
+    const key = "node-test";
+    const cachePath = path.resolve("node_modules");
+    testUtils.setInputs({
+        path: "node_modules",
+        key
+    });
+
+    process.env[Events.Key] = Events.PullRequest;
+
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: key,
+        scope: "refs/heads/master",
+        archiveLocation: "www.actionscache.test/download"
+    };
+    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    getCacheMock.mockImplementation(() => {
+        return Promise.resolve(cacheEntry);
+    });
+    const tempPath = "/foo/bar";
+
+    const createTempDirectoryMock = jest.spyOn(
+        actionUtils,
+        "createTempDirectory"
+    );
+    createTempDirectoryMock.mockImplementation(() => {
+        return Promise.resolve(tempPath);
+    });
+
+    const archivePath = path.join(tempPath, "cache.tgz");
+    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
+    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
+
+    const fileSize = 62915000;
+    const getArchiveFileSizeMock = jest
+        .spyOn(actionUtils, "getArchiveFileSize")
+        .mockReturnValue(fileSize);
+
+    const mkdirMock = jest.spyOn(io, "mkdirP");
+    const execMock = jest.spyOn(exec, "exec");
+    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(getCacheMock).toHaveBeenCalledWith([key]);
+    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
+    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
+    expect(downloadCacheMock).toHaveBeenCalledWith(cacheEntry, archivePath);
+    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
+    expect(infoMock).toHaveBeenCalledWith(`Cache Size: ~60 MB (62915000 B)`);
+    expect(mkdirMock).toHaveBeenCalledWith(cachePath);
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-xz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/")
+          ]
+        : ["-xz", "-f", archivePath, "-C", cachePath];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with cache found for restore key", async () => {
+    const key = "node-test";
+    const restoreKey = "node-";
+    const cachePath = path.resolve("node_modules");
+    testUtils.setInputs({
+        path: "node_modules",
+        key,
+        restoreKeys: [restoreKey]
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: restoreKey,
+        scope: "refs/heads/master",
+        archiveLocation: "www.actionscache.test/download"
+    };
+    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
+    getCacheMock.mockImplementation(() => {
+        return Promise.resolve(cacheEntry);
+    });
+    const tempPath = "/foo/bar";
+
+    const createTempDirectoryMock = jest.spyOn(
+        actionUtils,
+        "createTempDirectory"
+    );
+    createTempDirectoryMock.mockImplementation(() => {
+        return Promise.resolve(tempPath);
+    });
+
+    const archivePath = path.join(tempPath, "cache.tgz");
+    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
+    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
+
+    const fileSize = 142;
+    const getArchiveFileSizeMock = jest
+        .spyOn(actionUtils, "getArchiveFileSize")
+        .mockReturnValue(fileSize);
+
+    const mkdirMock = jest.spyOn(io, "mkdirP");
+    const execMock = jest.spyOn(exec, "exec");
+    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
+
+    await run();
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(getCacheMock).toHaveBeenCalledWith([key, restoreKey]);
+    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
+    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
+    expect(downloadCacheMock).toHaveBeenCalledWith(cacheEntry, archivePath);
+    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
+    expect(infoMock).toHaveBeenCalledWith(`Cache Size: ~0 MB (142 B)`);
+    expect(mkdirMock).toHaveBeenCalledWith(cachePath);
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-xz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/")
+          ]
+        : ["-xz", "-f", archivePath, "-C", cachePath];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(false);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache restored from key: ${restoreKey}`
+    );
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
diff --git a/__tests__/save.test.ts b/__tests__/save.test.ts
new file mode 100644
index 0000000..67b13d2
--- /dev/null
+++ b/__tests__/save.test.ts
@@ -0,0 +1,329 @@
+import * as core from "@actions/core";
+import * as exec from "@actions/exec";
+import * as io from "@actions/io";
+import * as path from "path";
+import * as cacheHttpClient from "../src/cacheHttpClient";
+import { Inputs } from "../src/constants";
+import { ArtifactCacheEntry } from "../src/contracts";
+import run from "../src/save";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("@actions/core");
+jest.mock("@actions/exec");
+jest.mock("@actions/io");
+jest.mock("../src/utils/actionUtils");
+jest.mock("../src/cacheHttpClient");
+
+beforeAll(() => {
+    jest.spyOn(core, "getInput").mockImplementation((name, options) => {
+        return jest.requireActual("@actions/core").getInput(name, options);
+    });
+
+    jest.spyOn(actionUtils, "getCacheState").mockImplementation(() => {
+        return jest.requireActual("../src/utils/actionUtils").getCacheState();
+    });
+
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "resolvePath").mockImplementation(filePath => {
+        return path.resolve(filePath);
+    });
+
+    jest.spyOn(actionUtils, "createTempDirectory").mockImplementation(() => {
+        return Promise.resolve("/foo/bar");
+    });
+
+    jest.spyOn(io, "which").mockImplementation(tool => {
+        return Promise.resolve(tool);
+    });
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+});
+
+test("save with no primary key in state outputs warning", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return "";
+        });
+
+    await run();
+
+    expect(warningMock).toHaveBeenCalledWith(
+        `Error retrieving key from state.`
+    );
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with exact match returns early", async () => {
+    const infoMock = jest.spyOn(core, "info");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: primaryKey,
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const execMock = jest.spyOn(exec, "exec");
+
+    await run();
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
+    );
+
+    expect(execMock).toHaveBeenCalledTimes(0);
+
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with missing input outputs warning", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    await run();
+
+    expect(warningMock).toHaveBeenCalledWith(
+        "Input required and not supplied: path"
+    );
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with large cache outputs warning", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    const cachePath = path.resolve(inputPath);
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const execMock = jest.spyOn(exec, "exec");
+
+    const cacheSize = 1024 * 1024 * 1024; //~1GB, over the 400MB limit
+    jest.spyOn(actionUtils, "getArchiveFileSize").mockImplementationOnce(() => {
+        return cacheSize;
+    });
+
+    await run();
+
+    const archivePath = path.join("/foo/bar", "cache.tgz");
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-cz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/"),
+              "."
+          ]
+        : ["-cz", "-f", archivePath, "-C", cachePath, "."];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(warningMock).toHaveBeenCalledWith(
+        "Cache size of ~1024 MB (1073741824 B) is over the 400MB limit, not saving cache."
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with server error outputs warning", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    const cachePath = path.resolve(inputPath);
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const execMock = jest.spyOn(exec, "exec");
+
+    const saveCacheMock = jest
+        .spyOn(cacheHttpClient, "saveCache")
+        .mockImplementationOnce(() => {
+            throw new Error("HTTP Error Occurred");
+        });
+
+    await run();
+
+    const archivePath = path.join("/foo/bar", "cache.tgz");
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-cz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/"),
+              "."
+          ]
+        : ["-cz", "-f", archivePath, "-C", cachePath, "."];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(primaryKey, archivePath);
+
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(warningMock).toHaveBeenCalledWith("HTTP Error Occurred");
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with valid inputs uploads a cache", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const cacheEntry: ArtifactCacheEntry = {
+        cacheKey: "Linux-node-",
+        scope: "refs/heads/master",
+        creationTime: "2019-11-13T19:18:02+00:00",
+        archiveLocation: "www.actionscache.test/download"
+    };
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return JSON.stringify(cacheEntry);
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    const cachePath = path.resolve(inputPath);
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const execMock = jest.spyOn(exec, "exec");
+
+    const saveCacheMock = jest.spyOn(cacheHttpClient, "saveCache");
+
+    await run();
+
+    const archivePath = path.join("/foo/bar", "cache.tgz");
+
+    const IS_WINDOWS = process.platform === "win32";
+    const args = IS_WINDOWS
+        ? [
+              "-cz",
+              "--force-local",
+              "-f",
+              archivePath.replace(/\\/g, "/"),
+              "-C",
+              cachePath.replace(/\\/g, "/"),
+              "."
+          ]
+        : ["-cz", "-f", archivePath, "-C", cachePath, "."];
+
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"tar"`, args);
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(primaryKey, archivePath);
+
+    expect(warningMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
diff --git a/examples.md b/examples.md
index b844b41..7d66b62 100644
--- a/examples.md
+++ b/examples.md
@@ -1,16 +1,25 @@
 # Examples
 
-- [C# - Nuget](#c---nuget)
-- [Elixir - Mix](#elixir---mix)
-- [Go - Modules](#go---modules)
-- [Java - Gradle](#java---gradle)
-- [Java - Maven](#java---maven)
-- [Node - npm](#node---npm)
-- [Node - Yarn](#node---yarn)
-- [Ruby - Gem](#ruby---gem)
-- [Rust - Cargo](#rust---cargo)
-- [Swift, Objective-C - Carthage](#swift-objective-c---carthage)
-- [Swift, Objective-C - CocoaPods](#swift-objective-c---cocoapods)
+- [Examples](#examples)
+  - [C# - Nuget](#c---nuget)
+  - [Elixir - Mix](#elixir---mix)
+  - [Go - Modules](#go---modules)
+  - [Java - Gradle](#java---gradle)
+  - [Java - Maven](#java---maven)
+  - [Node - npm](#node---npm)
+    - [macOS and Ubuntu](#macos-and-ubuntu)
+    - [Windows](#windows)
+    - [Using multiple systems and `npm config`](#using-multiple-systems-and-npm-config)
+  - [Node - Yarn](#node---yarn)
+  - [PHP - Composer](#php---composer)
+  - [Python - pip](#python---pip)
+    - [Simple example](#simple-example)
+    - [Multiple OS's in a workflow](#multiple-oss-in-a-workflow)
+    - [Using a script to get cache location](#using-a-script-to-get-cache-location)
+  - [Ruby - Gem](#ruby---gem)
+  - [Rust - Cargo](#rust---cargo)
+  - [Swift, Objective-C - Carthage](#swift-objective-c---carthage)
+  - [Swift, Objective-C - CocoaPods](#swift-objective-c---cocoapods)
 
 ## C# - Nuget
 Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/package-references-in-project-files#locking-dependencies):
@@ -69,24 +78,142 @@ Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/packa
 
 ## Node - npm
 
+For npm, cache files are stored in `~/.npm` on Posix, or `%AppData%/npm-cache` on Windows. See https://docs.npmjs.com/cli/cache#cache
+
+>Note: It is not recommended to cache `node_modules`, as it can break across Node versions and won't work with `npm ci`
+
+### macOS and Ubuntu
+
 ```yaml
 - uses: actions/cache@v1
   with:
-    path: node_modules
+    path: ~/.npm
+    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+    restore-keys: |
+      ${{ runner.os }}-node-
+```
+
+### Windows
+
+```yaml
+- uses: actions/cache@v1
+  with:
+    path: ~\AppData\Roaming\npm-cache
+    key: ${{ runner.os }}-node-${{ hashFiles('**\package-lock.json') }}
+    restore-keys: |
+      ${{ runner.os }}-node-
+```
+
+### Using multiple systems and `npm config`
+
+```yaml  
+- name: Get npm cache directory
+  id: npm-cache
+  run: |
+    echo "::set-output name=dir::$(npm config get cache)"
+- uses: actions/cache@v1
+  with:
+    path: ${{ steps.npm-cache.outputs.dir }}
     key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
     restore-keys: |
       ${{ runner.os }}-node-
 ```
 
 ## Node - Yarn
+The yarn cache directory will depend on your operating system and version of `yarn`. See https://yarnpkg.com/lang/en/docs/cli/cache/ for more info.
 
+```yaml
+- name: Get yarn cache
+  id: yarn-cache
+  run: echo "::set-output name=dir::$(yarn cache dir)"
+
+- uses: actions/cache@v1
+  with:
+    path: ${{ steps.yarn-cache.outputs.dir }}
+    key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+    restore-keys: |
+      ${{ runner.os }}-yarn-
+```
+
+## PHP - Composer
+
+```yaml  
+- name: Get Composer Cache Directory
+  id: composer-cache
+  run: |
+    echo "::set-output name=dir::$(composer config cache-files-dir)"
+- uses: actions/cache@v1
+  with:
+    path: ${{ steps.composer-cache.outputs.dir }}
+    key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+    restore-keys: |
+      ${{ runner.os }}-composer-
+```
+
+## Python - pip
+
+For pip, the cache directory will vary by OS. See https://pip.pypa.io/en/stable/reference/pip_install/#caching
+
+Locations:
+ - Ubuntu: `~/.cache/pip`
+ - Windows: `~\AppData\Local\pip\Cache`
+ - macOS: `~/Library/Caches/pip`
+
+### Simple example
 ```yaml
 - uses: actions/cache@v1
   with:
-    path: ~/.cache/yarn
-    key: ${{ runner.os }}-yarn-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
+    path: ~/.cache/pip
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
     restore-keys: |
-      ${{ runner.os }}-yarn-
+      ${{ runner.os }}-pip-
+```
+
+Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
+
+### Multiple OS's in a workflow
+
+```yaml
+- uses: actions/cache@v1
+  if: startsWith(runner.os, 'Linux')
+  with:
+    path: ~/.cache/pip
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+    restore-keys: |
+      ${{ runner.os }}-pip-
+
+- uses: actions/cache@v1
+  if: startsWith(runner.os, 'macOS')
+  with:
+    path: ~/Library/Caches/pip
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+    restore-keys: |
+      ${{ runner.os }}-pip-
+
+- uses: actions/cache@v1
+  if: startsWith(runner.os, 'Windows')
+  with:
+    path: ~\AppData\Local\pip\Cache
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+    restore-keys: |
+      ${{ runner.os }}-pip-
+```
+
+### Using a script to get cache location
+
+> Note: This uses an internal pip API and may not always work
+```yaml
+- name: Get pip cache
+   id: pip-cache
+   run: |
+     python -c "from pip._internal.locations import USER_CACHE_DIR; print('::set-output name=dir::' + USER_CACHE_DIR)"
+
+- uses: actions/cache@v1
+  with:
+    path: ${{ steps.pip-cache.outputs.dir }}
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+    restore-keys: |
+      ${{ runner.os }}-pip-
 ```
 
 ## Ruby - Gem
diff --git a/jest.config.js b/jest.config.js
index 42e7e56..59548f6 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,20 +1,23 @@
-module.exports = {
-  clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
-  verbose: true
-}
+require("nock").disableNetConnect();
 
-const processStdoutWrite = process.stdout.write.bind(process.stdout)
+module.exports = {
+    clearMocks: true,
+    moduleFileExtensions: ["js", "ts"],
+    testEnvironment: "node",
+    testMatch: ["**/*.test.ts"],
+    testRunner: "jest-circus/runner",
+    transform: {
+        "^.+\\.ts$": "ts-jest"
+    },
+    verbose: true
+};
+
+const processStdoutWrite = process.stdout.write.bind(process.stdout);
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
 process.stdout.write = (str, encoding, cb) => {
-  // Core library will directly call process.stdout.write for commands
-  // We don't want :: commands to be executed by the runner during tests
-  if (!str.match(/^::/)) {
-    return processStdoutWrite(str, encoding, cb);
-  }
-}
\ No newline at end of file
+    // Core library will directly call process.stdout.write for commands
+    // We don't want :: commands to be executed by the runner during tests
+    if (!str.match(/^::/)) {
+        return processStdoutWrite(str, encoding, cb);
+    }
+};
diff --git a/package-lock.json b/package-lock.json
index a3dc4ea..605ecc4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -477,6 +477,12 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -517,6 +523,21 @@
       "integrity": "sha512-yALhelO3i0hqZwhjtcr6dYyaLoCHbAMshwtj6cGxTvHZAKXHsYGdff6E8EPw3xLKY0ELUTQ69Q1rQiJENnccMA==",
       "dev": true
     },
+    "@types/json-schema": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.3.tgz",
+      "integrity": "sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==",
+      "dev": true
+    },
+    "@types/nock": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/@types/nock/-/nock-11.1.0.tgz",
+      "integrity": "sha512-jI/ewavBQ7X5178262JQR0ewicPAcJhXS/iFaNJl0VHLfyosZ/kwSrsa6VNQNSO8i9d8SqdRgOtZSOKJ/+iNMw==",
+      "dev": true,
+      "requires": {
+        "nock": "*"
+      }
+    },
     "@types/node": {
       "version": "12.6.9",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-12.6.9.tgz",
@@ -544,6 +565,73 @@
       "integrity": "sha512-SOhuU4wNBxhhTHxYaiG5NY4HBhDIDnJF60GU+2LqHAdKKer86//e4yg69aENCtQ04n0ovz+tq2YPME5t5yp4pw==",
       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.7.0.tgz",
+      "integrity": "sha512-H5G7yi0b0FgmqaEUpzyBlVh0d9lq4cWG2ap0RKa6BkF3rpBb6IrAoubt1NWh9R2kRs/f0k6XwRDiDz3X/FqXhQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "2.7.0",
+        "eslint-utils": "^1.4.2",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^2.0.1",
+        "tsutils": "^3.17.1"
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.7.0.tgz",
+      "integrity": "sha512-9/L/OJh2a5G2ltgBWJpHRfGnt61AgDeH6rsdg59BH0naQseSwR7abwHq3D5/op0KYD/zFT4LS5gGvWcMmegTEg==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "2.7.0",
+        "eslint-scope": "^5.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.7.0.tgz",
+      "integrity": "sha512-ctC0g0ZvYclxMh/xI+tyqP0EC2fAo6KicN9Wm2EIao+8OppLfxji7KAGJosQHSGBj3TcqUrA96AjgXuKa5ob2g==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.7.0",
+        "@typescript-eslint/typescript-estree": "2.7.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.7.0.tgz",
+      "integrity": "sha512-vVCE/DY72N4RiJ/2f10PTyYekX2OLaltuSIBqeHYI44GQ940VCYioInIb8jKMrK9u855OEJdFC+HmWAZTnC+Ag==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1",
+        "glob": "^7.1.4",
+        "is-glob": "^4.0.1",
+        "lodash.unescape": "4.0.1",
+        "semver": "^6.3.0",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
     "@zeit/ncc": {
       "version": "0.20.5",
       "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.20.5.tgz",
@@ -580,6 +668,12 @@
         }
       }
     },
+    "acorn-jsx": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
+      "dev": true
+    },
     "acorn-walk": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
@@ -629,6 +723,15 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -653,6 +756,16 @@
       "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
       "dev": true
     },
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
+      }
+    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -674,6 +787,12 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -963,6 +1082,12 @@
         }
       }
     },
+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -984,6 +1109,20 @@
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "dev": true
     },
+    "chai": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.2",
+        "deep-eql": "^3.0.1",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.1.0",
+        "type-detect": "^4.0.5"
+      }
+    },
     "chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -995,6 +1134,18 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -1030,6 +1181,21 @@
         }
       }
     },
+    "cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^3.1.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
     "cliui": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
@@ -1123,6 +1289,12 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "contains-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/contains-path/-/contains-path-0.1.0.tgz",
+      "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
+      "dev": true
+    },
     "convert-source-map": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
@@ -1234,6 +1406,15 @@
       "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
       "dev": true
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "^4.0.0"
+      }
+    },
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
@@ -1314,6 +1495,15 @@
       "integrity": "sha512-xLqpez+Zj9GKSnPWS0WZw1igGocZ+uua8+y+5dDNTT934N3QuY1sp2LkHzwiaYQGz60hMq0pjAshdeXm5VUOEw==",
       "dev": true
     },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "domexception": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-1.0.1.tgz",
@@ -1333,6 +1523,12 @@
         "safer-buffer": "^2.1.0"
       }
     },
+    "emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true
+    },
     "end-of-stream": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
@@ -1403,6 +1599,267 @@
         }
       }
     },
+    "eslint": {
+      "version": "6.6.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.6.0.tgz",
+      "integrity": "sha512-PpEBq7b6qY/qrOmpYQ/jTMDYfuQMELR4g4WI1M/NaSDDD/bdcMb+dj4Hgks7p41kW2caXsPsEZAEAyAgjVVC0g==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "ajv": "^6.10.0",
+        "chalk": "^2.1.0",
+        "cross-spawn": "^6.0.5",
+        "debug": "^4.0.1",
+        "doctrine": "^3.0.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^1.4.3",
+        "eslint-visitor-keys": "^1.1.0",
+        "espree": "^6.1.2",
+        "esquery": "^1.0.1",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^5.0.1",
+        "functional-red-black-tree": "^1.0.1",
+        "glob-parent": "^5.0.0",
+        "globals": "^11.7.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.0.0",
+        "imurmurhash": "^0.1.4",
+        "inquirer": "^7.0.0",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.3.0",
+        "lodash": "^4.17.14",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.8.2",
+        "progress": "^2.0.0",
+        "regexpp": "^2.0.1",
+        "semver": "^6.1.2",
+        "strip-ansi": "^5.2.0",
+        "strip-json-comments": "^3.0.1",
+        "table": "^5.2.3",
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
+    "eslint-config-prettier": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.5.0.tgz",
+      "integrity": "sha512-cjXp8SbO9VFGW/Z7mbTydqS9to8Z58E5aYhj3e1+Hx7lS9s6gL5ILKNpCqZAFOVYRcSkWPFYljHrEh8QFEK5EQ==",
+      "dev": true,
+      "requires": {
+        "get-stdin": "^6.0.0"
+      }
+    },
+    "eslint-import-resolver-node": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.2.tgz",
+      "integrity": "sha512-sfmTqJfPSizWu4aymbPr4Iidp5yKm8yDkHp+Ir3YiTHiiDfxh69mOUsmiqW6RZ9zRXFaF64GtYmN7e+8GHBv6Q==",
+      "dev": true,
+      "requires": {
+        "debug": "^2.6.9",
+        "resolve": "^1.5.0"
+      }
+    },
+    "eslint-module-utils": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/eslint-module-utils/-/eslint-module-utils-2.4.1.tgz",
+      "integrity": "sha512-H6DOj+ejw7Tesdgbfs4jeS4YMFrT8uI8xwd1gtQqXssaR0EQ26L+2O/w6wkYFy2MymON0fTwHmXBvvfLNZVZEw==",
+      "dev": true,
+      "requires": {
+        "debug": "^2.6.8",
+        "pkg-dir": "^2.0.0"
+      }
+    },
+    "eslint-plugin-import": {
+      "version": "2.18.2",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.18.2.tgz",
+      "integrity": "sha512-5ohpsHAiUBRNaBWAF08izwUGlbrJoJJ+W9/TBwsGoR1MnlgfwMIKrFeSjWbt6moabiXW9xNvtFz+97KHRfI4HQ==",
+      "dev": true,
+      "requires": {
+        "array-includes": "^3.0.3",
+        "contains-path": "^0.1.0",
+        "debug": "^2.6.9",
+        "doctrine": "1.5.0",
+        "eslint-import-resolver-node": "^0.3.2",
+        "eslint-module-utils": "^2.4.0",
+        "has": "^1.0.3",
+        "minimatch": "^3.0.4",
+        "object.values": "^1.1.0",
+        "read-pkg-up": "^2.0.0",
+        "resolve": "^1.11.0"
+      },
+      "dependencies": {
+        "doctrine": {
+          "version": "1.5.0",
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+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
+      }
+    },
     "test-exclude": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
@@ -4811,12 +5771,33 @@
         "require-main-filename": "^2.0.0"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "throat": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/throat/-/throat-4.1.0.tgz",
       "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
       "dev": true
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
@@ -4936,6 +5917,21 @@
         }
       }
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
     "tunnel": {
       "version": "0.0.4",
       "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.4.tgz",
@@ -4965,6 +5961,18 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
+    "type-fest": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",
+      "integrity": "sha512-DWkS49EQKVX//Tbupb9TFa19c7+MK1XmzkrZUR8TAktmE/DizXoaoJV6TZ/tSIPXipqNiRI6CyAe7x69Jb6RSw==",
+      "dev": true
+    },
     "typed-rest-client": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/typed-rest-client/-/typed-rest-client-1.5.0.tgz",
@@ -5096,6 +6104,12 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -5241,6 +6255,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
diff --git a/package.json b/package.json
index a235bd7..5bece1c 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
   "scripts": {
     "build": "tsc",
     "test": "tsc --noEmit && jest --coverage",
+    "lint": "eslint **/*.ts --cache",
     "format": "prettier --write **/*.ts",
     "format-check": "prettier --check **/*.ts",
     "release": "ncc build -o dist/restore src/restore.ts && ncc build -o dist/save src/save.ts && git add -f dist/"
@@ -31,11 +32,20 @@
   },
   "devDependencies": {
     "@types/jest": "^24.0.13",
+    "@types/nock": "^11.1.0",
     "@types/node": "^12.0.4",
     "@types/uuid": "^3.4.5",
+    "@typescript-eslint/eslint-plugin": "^2.7.0",
+    "@typescript-eslint/parser": "^2.7.0",
     "@zeit/ncc": "^0.20.5",
+    "eslint": "^6.6.0",
+    "eslint-config-prettier": "^6.5.0",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-jest": "^23.0.3",
+    "eslint-plugin-prettier": "^3.1.1",
     "jest": "^24.8.0",
     "jest-circus": "^24.7.1",
+    "nock": "^11.7.0",
     "prettier": "1.18.2",
     "ts-jest": "^24.0.2",
     "typescript": "^3.6.4"
diff --git a/src/cacheHttpClient.ts b/src/cacheHttpClient.ts
index 30b5009..e448157 100644
--- a/src/cacheHttpClient.ts
+++ b/src/cacheHttpClient.ts
@@ -1,13 +1,40 @@
 import * as core from "@actions/core";
 import * as fs from "fs";
-
 import { BearerCredentialHandler } from "typed-rest-client/Handlers";
 import { HttpClient } from "typed-rest-client/HttpClient";
 import { IHttpClientResponse } from "typed-rest-client/Interfaces";
-import { RestClient, IRequestOptions } from "typed-rest-client/RestClient";
-
+import { IRequestOptions, RestClient } from "typed-rest-client/RestClient";
 import { ArtifactCacheEntry } from "./contracts";
 
+function getCacheUrl(): string {
+    // Ideally we just use ACTIONS_CACHE_URL
+    const cacheUrl: string = (
+        process.env["ACTIONS_CACHE_URL"] ||
+        process.env["ACTIONS_RUNTIME_URL"] ||
+        ""
+    ).replace("pipelines", "artifactcache");
+    if (!cacheUrl) {
+        throw new Error(
+            "Cache Service Url not found, unable to restore cache."
+        );
+    }
+
+    core.debug(`Cache Url: ${cacheUrl}`);
+    return cacheUrl;
+}
+
+function createAcceptHeader(type: string, apiVersion: string): string {
+    return `${type};api-version=${apiVersion}`;
+}
+
+function getRequestOptions(): IRequestOptions {
+    const requestOptions: IRequestOptions = {
+        acceptHeader: createAcceptHeader("application/json", "5.2-preview.1")
+    };
+
+    return requestOptions;
+}
+
 export async function getCacheEntry(
     keys: string[]
 ): Promise<ArtifactCacheEntry | null> {
@@ -43,16 +70,6 @@ export async function getCacheEntry(
     return cacheResult;
 }
 
-export async function downloadCache(
-    cacheEntry: ArtifactCacheEntry,
-    archivePath: string
-): Promise<void> {
-    const stream = fs.createWriteStream(archivePath);
-    const httpClient = new HttpClient("actions/cache");
-    const downloadResponse = await httpClient.get(cacheEntry.archiveLocation!);
-    await pipeResponseToStream(downloadResponse, stream);
-}
-
 async function pipeResponseToStream(
     response: IHttpClientResponse,
     stream: NodeJS.WritableStream
@@ -64,7 +81,23 @@ async function pipeResponseToStream(
     });
 }
 
-export async function saveCache(stream: NodeJS.ReadableStream, key: string) {
+export async function downloadCache(
+    cacheEntry: ArtifactCacheEntry,
+    archivePath: string
+): Promise<void> {
+    const stream = fs.createWriteStream(archivePath);
+    const httpClient = new HttpClient("actions/cache");
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    const downloadResponse = await httpClient.get(cacheEntry.archiveLocation!);
+    await pipeResponseToStream(downloadResponse, stream);
+}
+
+export async function saveCache(
+    key: string,
+    archivePath: string
+): Promise<void> {
+    const stream = fs.createReadStream(archivePath);
+
     const cacheUrl = getCacheUrl();
     const token = process.env["ACTIONS_RUNTIME_TOKEN"] || "";
     const bearerCredentialHandler = new BearerCredentialHandler(token);
@@ -93,32 +126,3 @@ export async function saveCache(stream: NodeJS.ReadableStream, key: string) {
 
     core.info("Cache saved successfully");
 }
-
-function getRequestOptions(): IRequestOptions {
-    const requestOptions: IRequestOptions = {
-        acceptHeader: createAcceptHeader("application/json", "5.2-preview.1")
-    };
-
-    return requestOptions;
-}
-
-function createAcceptHeader(type: string, apiVersion: string): string {
-    return `${type};api-version=${apiVersion}`;
-}
-
-function getCacheUrl(): string {
-    // Ideally we just use ACTIONS_CACHE_URL
-    let cacheUrl: string = (
-        process.env["ACTIONS_CACHE_URL"] ||
-        process.env["ACTIONS_RUNTIME_URL"] ||
-        ""
-    ).replace("pipelines", "artifactcache");
-    if (!cacheUrl) {
-        throw new Error(
-            "Cache Service Url not found, unable to restore cache."
-        );
-    }
-
-    core.debug(`Cache Url: ${cacheUrl}`);
-    return cacheUrl;
-}
diff --git a/src/constants.ts b/src/constants.ts
index 80f6de9..5f26e8c 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,14 +1,20 @@
-export namespace Inputs {
-    export const Key = "key";
-    export const Path = "path";
-    export const RestoreKeys = "restore-keys";
+export enum Inputs {
+    Key = "key",
+    Path = "path",
+    RestoreKeys = "restore-keys"
 }
 
-export namespace Outputs {
-    export const CacheHit = "cache-hit";
+export enum Outputs {
+    CacheHit = "cache-hit"
 }
 
-export namespace State {
-    export const CacheKey = "CACHE_KEY";
-    export const CacheResult = "CACHE_RESULT";
+export enum State {
+    CacheKey = "CACHE_KEY",
+    CacheResult = "CACHE_RESULT"
+}
+
+export enum Events {
+    Key = "GITHUB_EVENT_NAME",
+    Push = "push",
+    PullRequest = "pull_request"
 }
diff --git a/src/restore.ts b/src/restore.ts
index 060c8d4..87a2684 100644
--- a/src/restore.ts
+++ b/src/restore.ts
@@ -1,18 +1,25 @@
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
 import * as io from "@actions/io";
-
-import * as fs from "fs";
 import * as path from "path";
-
 import * as cacheHttpClient from "./cacheHttpClient";
-import { Inputs, State } from "./constants";
+import { Events, Inputs, State } from "./constants";
 import * as utils from "./utils/actionUtils";
 
-async function run() {
+async function run(): Promise<void> {
     try {
         // Validate inputs, this can cause task failure
-        let cachePath = utils.resolvePath(
+        if (!utils.isValidEvent()) {
+            core.setFailed(
+                `Event Validation Error: The event type ${
+                    process.env[Events.Key]
+                } is not supported. Only ${utils
+                    .getSupportedEvents()
+                    .join(", ")} events are supported at this time.`
+            );
+        }
+
+        const cachePath = utils.resolvePath(
             core.getInput(Inputs.Path, { required: true })
         );
         core.debug(`Cache Path: ${cachePath}`);
@@ -60,7 +67,7 @@ async function run() {
                 return;
             }
 
-            let archivePath = path.join(
+            const archivePath = path.join(
                 await utils.createTempDirectory(),
                 "cache.tgz"
             );
@@ -72,26 +79,33 @@ async function run() {
             // Download the cache from the cache entry
             await cacheHttpClient.downloadCache(cacheEntry, archivePath);
 
-            io.mkdirP(cachePath);
+            const archiveFileSize = utils.getArchiveFileSize(archivePath);
+            core.info(
+                `Cache Size: ~${Math.round(
+                    archiveFileSize / (1024 * 1024)
+                )} MB (${archiveFileSize} B)`
+            );
+
+            // Create directory to extract tar into
+            await io.mkdirP(cachePath);
 
             // http://man7.org/linux/man-pages/man1/tar.1.html
             // tar [-options] <name of the tar archive> [files or directories which to add into archive]
-            const args = ["-xz"];
-
             const IS_WINDOWS = process.platform === "win32";
-            if (IS_WINDOWS) {
-                args.push("--force-local");
-                archivePath = archivePath.replace(/\\/g, "/");
-                cachePath = cachePath.replace(/\\/g, "/");
-            }
-            args.push(...["-f", archivePath, "-C", cachePath]);
+            const args = IS_WINDOWS
+                ? [
+                      "-xz",
+                      "--force-local",
+                      "-f",
+                      archivePath.replace(/\\/g, "/"),
+                      "-C",
+                      cachePath.replace(/\\/g, "/")
+                  ]
+                : ["-xz", "-f", archivePath, "-C", cachePath];
 
             const tarPath = await io.which("tar", true);
             core.debug(`Tar Path: ${tarPath}`);
 
-            const archiveFileSize = fs.statSync(archivePath).size;
-            core.debug(`File Size: ${archiveFileSize}`);
-
             await exec(`"${tarPath}"`, args);
 
             const isExactKeyMatch = utils.isExactKeyMatch(
diff --git a/src/save.ts b/src/save.ts
index 69e44cf..d660064 100644
--- a/src/save.ts
+++ b/src/save.ts
@@ -1,15 +1,12 @@
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
-
 import * as io from "@actions/io";
-import * as fs from "fs";
 import * as path from "path";
-
 import * as cacheHttpClient from "./cacheHttpClient";
 import { Inputs, State } from "./constants";
 import * as utils from "./utils/actionUtils";
 
-async function run() {
+async function run(): Promise<void> {
     try {
         const state = utils.getCacheState();
 
@@ -27,12 +24,12 @@ async function run() {
             return;
         }
 
-        let cachePath = utils.resolvePath(
+        const cachePath = utils.resolvePath(
             core.getInput(Inputs.Path, { required: true })
         );
         core.debug(`Cache Path: ${cachePath}`);
 
-        let archivePath = path.join(
+        const archivePath = path.join(
             await utils.createTempDirectory(),
             "cache.tgz"
         );
@@ -40,32 +37,36 @@ async function run() {
 
         // http://man7.org/linux/man-pages/man1/tar.1.html
         // tar [-options] <name of the tar archive> [files or directories which to add into archive]
-        const args = ["-cz"];
         const IS_WINDOWS = process.platform === "win32";
-        if (IS_WINDOWS) {
-            args.push("--force-local");
-            archivePath = archivePath.replace(/\\/g, "/");
-            cachePath = cachePath.replace(/\\/g, "/");
-        }
-
-        args.push(...["-f", archivePath, "-C", cachePath, "."]);
+        const args = IS_WINDOWS
+            ? [
+                  "-cz",
+                  "--force-local",
+                  "-f",
+                  archivePath.replace(/\\/g, "/"),
+                  "-C",
+                  cachePath.replace(/\\/g, "/"),
+                  "."
+              ]
+            : ["-cz", "-f", archivePath, "-C", cachePath, "."];
 
         const tarPath = await io.which("tar", true);
         core.debug(`Tar Path: ${tarPath}`);
         await exec(`"${tarPath}"`, args);
 
         const fileSizeLimit = 400 * 1024 * 1024; // 400MB
-        const archiveFileSize = fs.statSync(archivePath).size;
+        const archiveFileSize = utils.getArchiveFileSize(archivePath);
         core.debug(`File Size: ${archiveFileSize}`);
         if (archiveFileSize > fileSizeLimit) {
             core.warning(
-                `Cache size of ${archiveFileSize} bytes is over the 400MB limit, not saving cache.`
+                `Cache size of ~${Math.round(
+                    archiveFileSize / (1024 * 1024)
+                )} MB (${archiveFileSize} B) is over the 400MB limit, not saving cache.`
             );
             return;
         }
 
-        const stream = fs.createReadStream(archivePath);
-        await cacheHttpClient.saveCache(stream, primaryKey);
+        await cacheHttpClient.saveCache(primaryKey, archivePath);
     } catch (error) {
         core.warning(error.message);
     }
diff --git a/src/utils/actionUtils.ts b/src/utils/actionUtils.ts
index d4d7638..ba5b2ea 100644
--- a/src/utils/actionUtils.ts
+++ b/src/utils/actionUtils.ts
@@ -1,10 +1,11 @@
 import * as core from "@actions/core";
 import * as io from "@actions/io";
+import * as fs from "fs";
 import * as os from "os";
 import * as path from "path";
 import * as uuidV4 from "uuid/v4";
 
-import { Outputs, State } from "../constants";
+import { Events, Outputs, State } from "../constants";
 import { ArtifactCacheEntry } from "../contracts";
 
 // From https://github.com/actions/toolkit/blob/master/packages/tool-cache/src/tool-cache.ts#L23
@@ -32,6 +33,10 @@ export async function createTempDirectory(): Promise<string> {
     return dest;
 }
 
+export function getArchiveFileSize(path: string): number {
+    return fs.statSync(path).size;
+}
+
 export function isExactKeyMatch(
     key: string,
     cacheResult?: ArtifactCacheEntry
@@ -45,10 +50,18 @@ export function isExactKeyMatch(
     );
 }
 
+export function setCacheState(state: ArtifactCacheEntry): void {
+    core.saveState(State.CacheResult, JSON.stringify(state));
+}
+
+export function setCacheHitOutput(isCacheHit: boolean): void {
+    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
+}
+
 export function setOutputAndState(
     key: string,
     cacheResult?: ArtifactCacheEntry
-) {
+): void {
     setCacheHitOutput(isExactKeyMatch(key, cacheResult));
     // Store the cache result if it exists
     cacheResult && setCacheState(cacheResult);
@@ -57,15 +70,11 @@ export function setOutputAndState(
 export function getCacheState(): ArtifactCacheEntry | undefined {
     const stateData = core.getState(State.CacheResult);
     core.debug(`State: ${stateData}`);
-    return (stateData && JSON.parse(stateData)) as ArtifactCacheEntry;
-}
+    if (stateData) {
+        return JSON.parse(stateData) as ArtifactCacheEntry;
+    }
 
-export function setCacheState(state: ArtifactCacheEntry) {
-    core.saveState(State.CacheResult, JSON.stringify(state));
-}
-
-export function setCacheHitOutput(isCacheHit: boolean) {
-    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
+    return undefined;
 }
 
 export function resolvePath(filePath: string): string {
@@ -79,3 +88,15 @@ export function resolvePath(filePath: string): string {
 
     return path.resolve(filePath);
 }
+
+export function getSupportedEvents(): string[] {
+    return [Events.Push, Events.PullRequest];
+}
+
+// Currently the cache token is only authorized for push and pull_request events
+// All other events will fail when reading and saving the cache
+// See GitHub Context https://help.github.com/actions/automating-your-workflow-with-github-actions/contexts-and-expression-syntax-for-github-actions#github-context
+export function isValidEvent(): boolean {
+    const githubEvent = process.env[Events.Key] || "";
+    return getSupportedEvents().includes(githubEvent);
+}
diff --git a/src/utils/testUtils.ts b/src/utils/testUtils.ts
index 67121c7..b1d20d0 100644
--- a/src/utils/testUtils.ts
+++ b/src/utils/testUtils.ts
@@ -1,7 +1,29 @@
+import { Inputs } from "../constants";
+
+// See: https://github.com/actions/toolkit/blob/master/packages/core/src/core.ts#L67
 function getInputName(name: string): string {
     return `INPUT_${name.replace(/ /g, "_").toUpperCase()}`;
 }
 
-export function setInput(name: string, value: string) {
+export function setInput(name: string, value: string): void {
     process.env[getInputName(name)] = value;
 }
+
+interface CacheInput {
+    path: string;
+    key: string;
+    restoreKeys?: string[];
+}
+
+export function setInputs(input: CacheInput): void {
+    setInput(Inputs.Path, input.path);
+    setInput(Inputs.Key, input.key);
+    input.restoreKeys &&
+        setInput(Inputs.RestoreKeys, input.restoreKeys.join("\n"));
+}
+
+export function clearInputs(): void {
+    delete process.env[getInputName(Inputs.Path)];
+    delete process.env[getInputName(Inputs.Key)];
+    delete process.env[getInputName(Inputs.RestoreKeys)];
+}