Test sudo tar

"it's" is short for "it is," but the use in this sentence is as a
possessive - something belonging to "it" - hence, "its" is correct.

.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"]
+}

.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

README.md

@@ -2,7 +2,11 @@
 
 This GitHub Action allows caching dependencies and build outputs to improve workflow execution time.
 
-<a href="https://github.com/actions/cache"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg"></a>
+<a href="https://github.com/actions/cache/actions?query=workflow%3ATests"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg?branch=master&event=push"></a>
+
+## Documentation
+
+See ["Caching dependencies to speed up workflows"](https://help.github.com/github/automating-your-workflow-with-github-actions/caching-dependencies-to-speed-up-workflows).
 
 ## Usage
 
@@ -24,42 +28,56 @@ Create a workflow `.yml` file in your repositories `.github/workflows` directory
 ### Example workflow
 
 ```yaml
-name: Example Caching with npm
+name: Caching Primes
 
 on: push
 
 jobs:
   build:
     runs-on: ubuntu-latest
-    
+
     steps:
     - uses: actions/checkout@v1
 
-    - name: Cache node modules
-      uses: actions/cache@preview
+    - 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: Build
-      run: npm run build
+    - name: Generate Prime Numbers
+      if: steps.cache-primes.outputs.cache-hit != 'true'
+      run: /generate-primes.sh -d prime-numbers
 
-    - name: Test
-      run: npm run test
+    - name: Use Prime Numbers
+      run: /primes.sh -d prime-numbers
 ```
 
-## Ecosystem Examples
+## Implementation Examples
+
+Every programming language and framework has its own way of caching.
+
+See [Examples](examples.md) for a list of `actions/cache` implementations for use with:
+
+- [C# - Nuget](./examples.md#c---nuget)
+- [Elixir - Mix](./examples.md#elixir---mix)
+- [Go - Modules](./examples.md#go---modules)
+- [Java - Gradle](./examples.md#java---gradle)
+- [Java - Maven](./examples.md#java---maven)
+- [Node - npm](./examples.md#node---npm)
+- [Node - Yarn](./examples.md#node---yarn)
+- [PHP - Composer](./examples.md#php---composer)
+- [Python - pip](./examples.md#python---pip)
+- [Ruby - Gem](./examples.md#ruby---gem)
+- [Rust - Cargo](./examples.md#rust---cargo)
+- [Swift, Objective-C - Carthage](./examples.md#swift-objective-c---carthage)
+- [Swift, Objective-C - CocoaPods](./examples.md#swift-objective-c---cocoapods)
 
-See [Examples](examples.md)
 
 ## Cache Limits
 
-Individual caches are limited to 200MB and a repository can have up to 2GB of caches. Once the 2GB limit is reached, older caches will be evicted based on when the cache was last accessed.  Caches that are not accessed within the last week will also be evicted.
+Individual caches are limited to 400MB and a repository can have up to 2GB of caches. Once the 2GB limit is reached, older caches will be evicted based on when the cache was last accessed.  Caches that are not accessed within the last week will also be evicted.
 
 ## Skipping steps based on cache-hit
 
@@ -70,12 +88,12 @@ Example:
 steps:
   - uses: actions/checkout@v1
 
-  - uses: actions/cache@preview
+  - uses: actions/cache@v1
     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'
     run: /install.sh

__tests__/__fixtures__/helloWorld.txt

@@ -0,0 +1 @@
+hello world

__tests__/actionUtils.test.ts

@@ -0,0 +1,236 @@
+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("logWarning logs a message with a warning prefix", () => {
+    const message = "A warning occurred.";
+
+    const infoMock = jest.spyOn(core, "info");
+
+    actionUtils.logWarning(message);
+
+    expect(infoMock).toHaveBeenCalledWith(`[warning]${message}`);
+});
+
+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);
+});

__tests__/main.test.ts

@@ -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"
-    );
-});

__tests__/restore.test.ts

@@ -0,0 +1,394 @@
+import * as core from "@actions/core";
+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 tar from "../src/tar";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("../src/cacheHttpClient");
+jest.mock("../src/tar");
+jest.mock("../src/utils/actionUtils");
+
+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();
+    });
+});
+
+beforeEach(() => {
+    process.env[Events.Key] = Events.Push;
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+});
+
+test("restore with invalid event outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const invalidEvent = "commit_comment";
+    process.env[Events.Key] = invalidEvent;
+    await run();
+    expect(logWarningMock).toHaveBeenCalledWith(
+        `Event Validation Error: The event type ${invalidEvent} is not supported. Only push, pull_request events are supported at this time.`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+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 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(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 logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    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(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(logWarningMock).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 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(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 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 extractTarMock = jest.spyOn(tar, "extractTar");
+    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(extractTarMock).toHaveBeenCalledTimes(1);
+    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    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 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 extractTarMock = jest.spyOn(tar, "extractTar");
+    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(extractTarMock).toHaveBeenCalledTimes(1);
+    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    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 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 extractTarMock = jest.spyOn(tar, "extractTar");
+    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(extractTarMock).toHaveBeenCalledTimes(1);
+    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith(false);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache restored from key: ${restoreKey}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/save.test.ts

@@ -0,0 +1,306 @@
+import * as core from "@actions/core";
+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/save";
+import * as tar from "../src/tar";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("@actions/core");
+jest.mock("../src/cacheHttpClient");
+jest.mock("../src/tar");
+jest.mock("../src/utils/actionUtils");
+
+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, "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(actionUtils, "resolvePath").mockImplementation(filePath => {
+        return path.resolve(filePath);
+    });
+
+    jest.spyOn(actionUtils, "createTempDirectory").mockImplementation(() => {
+        return Promise.resolve("/foo/bar");
+    });
+});
+
+beforeEach(() => {
+    process.env[Events.Key] = Events.Push;
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+});
+
+test("save with invalid event outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const invalidEvent = "commit_comment";
+    process.env[Events.Key] = invalidEvent;
+    await run();
+    expect(logWarningMock).toHaveBeenCalledWith(
+        `Event Validation Error: The event type ${invalidEvent} is not supported. Only push, pull_request events are supported at this time.`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with no primary key in state outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    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(logWarningMock).toHaveBeenCalledWith(
+        `Error retrieving key from state.`
+    );
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with exact match returns early", async () => {
+    const infoMock = jest.spyOn(core, "info");
+    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 createTarMock = jest.spyOn(tar, "createTar");
+
+    await run();
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
+    );
+
+    expect(createTarMock).toHaveBeenCalledTimes(0);
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with missing input outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    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(logWarningMock).toHaveBeenCalledWith(
+        "Input required and not supplied: path"
+    );
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with large cache outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    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 createTarMock = jest.spyOn(tar, "createTar");
+
+    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");
+
+    expect(createTarMock).toHaveBeenCalledTimes(1);
+    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(logWarningMock).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 logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    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 createTarMock = jest.spyOn(tar, "createTar");
+
+    const saveCacheMock = jest
+        .spyOn(cacheHttpClient, "saveCache")
+        .mockImplementationOnce(() => {
+            throw new Error("HTTP Error Occurred");
+        });
+
+    await run();
+
+    const archivePath = path.join("/foo/bar", "cache.tgz");
+
+    expect(createTarMock).toHaveBeenCalledTimes(1);
+    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(primaryKey, archivePath);
+
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(logWarningMock).toHaveBeenCalledWith("HTTP Error Occurred");
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with valid inputs uploads a cache", async () => {
+    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 createTarMock = jest.spyOn(tar, "createTar");
+    const saveCacheMock = jest.spyOn(cacheHttpClient, "saveCache");
+
+    await run();
+
+    const archivePath = path.join("/foo/bar", "cache.tgz");
+
+    expect(createTarMock).toHaveBeenCalledTimes(1);
+    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(primaryKey, archivePath);
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/tar.test.ts

@@ -0,0 +1,58 @@
+import * as exec from "@actions/exec";
+import * as io from "@actions/io";
+import * as tar from "../src/tar";
+
+jest.mock("@actions/exec");
+jest.mock("@actions/io");
+
+beforeAll(() => {
+    jest.spyOn(io, "which").mockImplementation(tool => {
+        return Promise.resolve(tool);
+    });
+});
+
+test("extract tar", async () => {
+    const mkdirMock = jest.spyOn(io, "mkdirP");
+    const execMock = jest.spyOn(exec, "exec");
+
+    const archivePath = "cache.tar";
+    const targetDirectory = "~/.npm/cache";
+    await tar.extractTar(archivePath, targetDirectory);
+
+    expect(mkdirMock).toHaveBeenCalledWith(targetDirectory);
+
+    const IS_WINDOWS = process.platform === "win32";
+    const tarPath = IS_WINDOWS
+        ? `${process.env["windir"]}\\System32\\tar.exe`
+        : "tar";
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"${tarPath}"`, [
+        "-xz",
+        "-f",
+        archivePath,
+        "-C",
+        targetDirectory
+    ]);
+});
+
+test("create tar", async () => {
+    const execMock = jest.spyOn(exec, "exec");
+
+    const archivePath = "cache.tar";
+    const sourceDirectory = "~/.npm/cache";
+    await tar.createTar(archivePath, sourceDirectory);
+
+    const IS_WINDOWS = process.platform === "win32";
+    const tarPath = IS_WINDOWS
+        ? `${process.env["windir"]}\\System32\\tar.exe`
+        : "tar";
+    expect(execMock).toHaveBeenCalledTimes(1);
+    expect(execMock).toHaveBeenCalledWith(`"${tarPath}"`, [
+        "-cz",
+        "-f",
+        archivePath,
+        "-C",
+        sourceDirectory,
+        "."
+    ]);
+});

examples.md

@@ -1,43 +1,24 @@
 # Examples
 
-- [Node - npm](#node---npm)
-- [Node - Yarn](#node---yarn)
-- [C# - Nuget](#c---nuget)
+- [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)
+- [PHP - Composer](#php---composer)
+- [Python - pip](#python---pip)
+- [Ruby - Gem](#ruby---gem)
+- [Rust - Cargo](#rust---cargo)
 - [Swift, Objective-C - Carthage](#swift-objective-c---carthage)
 - [Swift, Objective-C - CocoaPods](#swift-objective-c---cocoapods)
-- [Ruby - Gem](#ruby---gem)
-- [Go - Modules](#go---modules)
-- [Elixir - Mix](#elixir---mix)
-- [Rust - Cargo](#rust---cargo)
 
-## Node - npm
-
-```yaml
-- uses: actions/cache@preview
-  with:
-    path: node_modules
-    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-    restore-keys: |
-      ${{ runner.os }}-node-
-```
-
-## Node - Yarn
-
-```yaml
-- uses: actions/cache@preview
-  with:
-    path: ~/.cache/yarn
-    key: ${{ runner.os }}-yarn-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
-    restore-keys: |
-      ${{ runner.os }}-yarn-
-```
-
-## C# - Nuget
+## C# - NuGet
 Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/package-references-in-project-files#locking-dependencies):
+
 ```yaml
-- uses: actions/cache@preview
+- uses: actions/cache@v1
   with:
     path: ~/.nuget/packages
     key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
@@ -45,10 +26,46 @@ Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/packa
       ${{ runner.os }}-nuget-
 ```
 
+Depending on the environment, huge packages might be pre-installed in the global cache folder.
+If you do not want to include them, consider to move the cache folder like below.
+>Note: This workflow does not work for projects that require files to be placed in user profile package folder
+```yaml
+env:
+  NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
+steps:
+  - uses: actions/cache@v1
+    with:
+      path: ${{ github.workspace }}/.nuget/packages
+      key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
+      restore-keys: |
+        ${{ runner.os }}-nuget-
+```
+
+## Elixir - Mix
+```yaml
+- uses: actions/cache@v1
+  with:
+    path: deps
+    key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+    restore-keys: |
+      ${{ runner.os }}-mix-
+```
+
+## Go - Modules
+
+```yaml
+- uses: actions/cache@v1
+  with:
+    path: ~/go/pkg/mod
+    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+    restore-keys: |
+      ${{ runner.os }}-go-
+```
+
 ## Java - Gradle
 
 ```yaml
-- uses: actions/cache@preview
+- uses: actions/cache@v1
   with:
     path: ~/.gradle/caches
     key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
@@ -59,7 +76,7 @@ Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/packa
 ## Java - Maven
 
 ```yaml
-- uses: actions/cache@preview
+- uses: actions/cache@v1
   with:
     path: ~/.m2/repository
     key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
@@ -67,76 +84,203 @@ Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/packa
       ${{ runner.os }}-maven-
 ```
 
-## Swift, Objective-C - Carthage
+## 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@preview
-      with:
-        path: Carthage
-        key: ${{ runner.os }}-carthage-${{ hashFiles('**/Cartfile.resolved') }}
-        restore-keys: |
-          ${{ runner.os }}-carthage-
+- uses: actions/cache@v1
+  with:
+    path: ~/.npm
+    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+    restore-keys: |
+      ${{ runner.os }}-node-
 ```
 
-## Swift, Objective-C - CocoaPods
+### Windows
 
 ```yaml
-- uses: actions/cache@preview
+- uses: actions/cache@v1
   with:
-    path: Pods
-    key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
+    path: ~\AppData\Roaming\npm-cache
+    key: ${{ runner.os }}-node-${{ hashFiles('**\package-lock.json') }}
     restore-keys: |
-      ${{ runner.os }}-pods-
+      ${{ runner.os }}-node-
+```
+
+### Using multiple systems and `npm config`
+
+```yaml  
+- name: Get npm cache directory
+  id: npm-cache
+  run: |
+    echo "::set-output name=dir::$(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/pip
+    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+    restore-keys: |
+      ${{ 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
 
 ```yaml
-- uses: actions/cache@preview
+- uses: actions/cache@v1
   with:
     path: vendor/bundle
     key: ${{ runner.os }}-gem-${{ hashFiles('**/Gemfile.lock') }}
     restore-keys: |
       ${{ runner.os }}-gem-
 ```
-
-## Go - Modules
+When dependencies are installed later in the workflow, we must specify the same path for the bundler.
 
 ```yaml
-- uses: actions/cache@preview
-  with:
-    path: ~/go/pkg/mod
-    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-    restore-keys: |
-      ${{ runner.os }}-go-
-```
-
-## Elixir - Mix
-```yaml
-- uses: actions/cache@preview
-  with:
-    path: deps
-    key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
-    restore-keys: |
-      ${{ runner.os }}-mix-
+- name: Bundle install
+  run: |
+    bundle config path vendor/bundle
+    bundle install --jobs 4 --retry 3
 ```
 
 ## Rust - Cargo
 
-```
+```yaml
 - name: Cache cargo registry
-  uses: actions/cache@preview
+  uses: actions/cache@v1
   with:
     path: ~/.cargo/registry
     key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
 - name: Cache cargo index
-  uses: actions/cache@preview
+  uses: actions/cache@v1
   with:
     path: ~/.cargo/git
     key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
 - name: Cache cargo build
-  uses: actions/cache@preview
+  uses: actions/cache@v1
   with:
     path: target
     key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
 ```
+
+## Swift, Objective-C - Carthage
+
+```yaml
+- uses: actions/cache@v1
+  with:
+    path: Carthage
+    key: ${{ runner.os }}-carthage-${{ hashFiles('**/Cartfile.resolved') }}
+    restore-keys: |
+      ${{ runner.os }}-carthage-
+```
+
+## Swift, Objective-C - CocoaPods
+
+```yaml
+- uses: actions/cache@v1
+  with:
+    path: Pods
+    key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
+    restore-keys: |
+      ${{ runner.os }}-pods-
+```

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);
-  }
-}
+    // 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);
+    }
+};

package.json

@@ -1,12 +1,13 @@
 {
   "name": "cache",
-  "version": "0.0.2",
+  "version": "1.0.3",
   "private": true,
   "description": "Cache dependencies and build outputs",
   "main": "dist/restore/index.js",
   "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/"
@@ -31,13 +32,22 @@
   },
   "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",
-    "prettier": "1.18.2",
+    "nock": "^11.7.0",
+    "prettier": "^1.19.1",
     "ts-jest": "^24.0.2",
-    "typescript": "^3.6.4"
+    "typescript": "^3.7.3"
   }
 }

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> {
@@ -34,25 +61,16 @@ export async function getCacheEntry(
         throw new Error(`Cache service responded with ${response.statusCode}`);
     }
     const cacheResult = response.result;
-    core.debug(`Cache Result:`);
-    core.debug(JSON.stringify(cacheResult));
     if (!cacheResult || !cacheResult.archiveLocation) {
         throw new Error("Cache not found.");
     }
+    core.setSecret(cacheResult.archiveLocation);
+    core.debug(`Cache Result:`);
+    core.debug(JSON.stringify(cacheResult));
 
     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 +82,23 @@ 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 +127,3 @@ 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;
-}

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"
 }

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 { extractTar } from "./tar";
 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()) {
+            utils.logWarning(
+                `Event Validation Error: The event type ${
+                    process.env[Events.Key]
+                } is not supported. Only ${utils
+                    .getSupportedEvents()
+                    .join(", ")} events are supported at this time.`
+            );
+            return;
+        }
+
+        const cachePath = utils.resolvePath(
             core.getInput(Inputs.Path, { required: true })
         );
         core.debug(`Cache Path: ${cachePath}`);
@@ -20,7 +27,10 @@ async function run() {
         const primaryKey = core.getInput(Inputs.Key, { required: true });
         core.saveState(State.CacheKey, primaryKey);
 
-        const restoreKeys = core.getInput(Inputs.RestoreKeys).split("\n");
+        const restoreKeys = core
+            .getInput(Inputs.RestoreKeys)
+            .split("\n")
+            .filter(x => x !== "");
         const keys = [primaryKey, ...restoreKeys];
 
         core.debug("Resolved Keys:");
@@ -52,12 +62,12 @@ async function run() {
             const cacheEntry = await cacheHttpClient.getCacheEntry(keys);
             if (!cacheEntry) {
                 core.info(
-                    `Cache not found for input keys: ${JSON.stringify(keys)}.`
+                    `Cache not found for input keys: ${keys.join(", ")}.`
                 );
                 return;
             }
 
-            let archivePath = path.join(
+            const archivePath = path.join(
                 await utils.createTempDirectory(),
                 "cache.tgz"
             );
@@ -69,27 +79,14 @@ 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)`
+            );
 
-            // 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 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);
+            await extractTar(archivePath, cachePath);
 
             const isExactKeyMatch = utils.isExactKeyMatch(
                 primaryKey,
@@ -101,7 +98,7 @@ async function run() {
                 `Cache restored from key: ${cacheEntry && cacheEntry.cacheKey}`
             );
         } catch (error) {
-            core.warning(error.message);
+            utils.logWarning(error.message);
             utils.setCacheHitOutput(false);
         }
     } catch (error) {

src/save.ts

@@ -1,22 +1,29 @@
 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 { createTar } from "./tar";
 import * as utils from "./utils/actionUtils";
 
-async function run() {
+async function run(): Promise<void> {
     try {
+        if (!utils.isValidEvent()) {
+            utils.logWarning(
+                `Event Validation Error: The event type ${
+                    process.env[Events.Key]
+                } is not supported. Only ${utils
+                    .getSupportedEvents()
+                    .join(", ")} events are supported at this time.`
+            );
+            return;
+        }
+
         const state = utils.getCacheState();
 
         // Inputs are re-evaluted before the post action, so we want the original key used for restore
         const primaryKey = core.getState(State.CacheKey);
         if (!primaryKey) {
-            core.warning(`Error retrieving key from state.`);
+            utils.logWarning(`Error retrieving key from state.`);
             return;
         }
 
@@ -27,47 +34,34 @@ 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"
         );
         core.debug(`Archive Path: ${archivePath}`);
 
-        // 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, "/");
-        }
+        await createTar(archivePath, cachePath);
 
-        args.push(...["-f", archivePath, "-C", cachePath, "."]);
-
-        const tarPath = await io.which("tar", true);
-        core.debug(`Tar Path: ${tarPath}`);
-        await exec(`"${tarPath}"`, args);
-
-        const fileSizeLimit = 200 * 1024 * 1024; // 200MB
-        const archiveFileSize = fs.statSync(archivePath).size;
+        const fileSizeLimit = 400 * 1024 * 1024; // 400MB
+        const archiveFileSize = utils.getArchiveFileSize(archivePath);
         core.debug(`File Size: ${archiveFileSize}`);
         if (archiveFileSize > fileSizeLimit) {
-            core.warning(
-                `Cache size of ${archiveFileSize} bytes is over the 200MB limit, not saving cache.`
+            utils.logWarning(
+                `Cache size of ~${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);
+        utils.logWarning(error.message);
     }
 }
 

src/tar.ts

@@ -0,0 +1,49 @@
+import { exec } from "@actions/exec";
+import * as io from "@actions/io";
+import { existsSync } from "fs";
+
+async function getTarPath(): Promise<string> {
+    // Explicitly use BSD Tar on Windows
+    const IS_WINDOWS = process.platform === "win32";
+    if (IS_WINDOWS) {
+        const systemTar = `${process.env["windir"]}\\System32\\tar.exe`;
+        if (existsSync(systemTar)) {
+            return systemTar;
+        }
+    }
+    return await io.which("tar", true);
+}
+
+async function execTar(args: string[]): Promise<void> {
+    try {
+        const tarPath = await getTarPath();
+        const tarExec = process.platform !== "win32" ? `sudo ${tarPath}` : tarPath;
+        await exec(`"${tarExec}"`, args);
+    } catch (error) {
+        const IS_WINDOWS = process.platform === "win32";
+        if (IS_WINDOWS) {
+            throw new Error(
+                `Tar failed with error: ${error?.message}. Ensure BSD tar is installed and on the PATH.`
+            );
+        }
+        throw new Error(`Tar failed with error: ${error?.message}`);
+    }
+}
+
+export async function extractTar(
+    archivePath: string,
+    targetDirectory: string
+): Promise<void> {
+    // Create directory to extract tar into
+    await io.mkdirP(targetDirectory);
+    const args = ["-xz", "-f", archivePath, "-C", targetDirectory];
+    await execTar(args);
+}
+
+export async function createTar(
+    archivePath: string,
+    sourceDirectory: string
+): Promise<void> {
+    const args = ["-cz", "-f", archivePath, "-C", sourceDirectory, "."];
+    await execTar(args);
+}

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 +70,16 @@ 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;
+    }
+
+    return undefined;
 }
 
-export function setCacheState(state: ArtifactCacheEntry) {
-    core.saveState(State.CacheResult, JSON.stringify(state));
-}
-
-export function setCacheHitOutput(isCacheHit: boolean) {
-    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
+export function logWarning(message: string): void {
+    const warningPrefix = "[warning]";
+    core.info(`${warningPrefix}${message}`);
 }
 
 export function resolvePath(filePath: string): string {
@@ -79,3 +93,15 @@ 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);
+}

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)];
+}