Use GitHub releases to download python versions

.github/workflows/test.yml

@@ -0,0 +1,57 @@
+name: Validate 'setup-python'
+on: 
+  push:
+  pull_request:
+  schedule:
+    - cron: 0 0 * * *
+
+jobs:
+  default-version:
+    name: Setup default version
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: setup default python 
+      uses: ./
+
+    - name: Validate version
+      run: python --version
+
+    - name: Run simple python code
+      run: python -c 'import math; print(math.factorial(5))'
+
+  setup-versions-from-manifest:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-16.04, ubuntu-18.04]
+        python: [3.5.3, 3.6.7, 3.7.5, 3.8.1]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: setup-python ${{ matrix.python }}
+      uses: ./
+      with:
+        python-version: ${{ matrix.python }}
+
+    - name: Validate version
+      run: |
+        $pythonVersion = (python --version)
+        if ("Python ${{ matrix.python }}" -ne "$pythonVersion"){
+          Write-Host "The current version is $pythonVersion; expected version is ${{ matrix.python }}"
+          exit 1
+        }
+        $pythonVersion
+      shell: pwsh
+
+    - name: Run simple code
+      run: python -c 'import math; print(math.factorial(5))'

__tests__/data/python-release.json

@@ -0,0 +1,13 @@
+{
+    "version": "1.2.3",
+    "stable": true,
+    "release_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-1.2.3-linux-x64.tar.gz",
+        "arch": "x64",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x64.tar.gz"
+      }      
+    ]
+}

__tests__/finder.test.ts

@@ -18,19 +18,48 @@ const tempDir = path.join(
 process.env['RUNNER_TOOL_CACHE'] = toolDir;
 process.env['RUNNER_TEMP'] = tempDir;
 
+import * as tc from '@actions/tool-cache';
 import * as finder from '../src/find-python';
+import * as installer from '../src/install-python';
+
+const pythonRelease = require('./data/python-release.json');
 
 describe('Finder tests', () => {
+  afterEach(() => {
+    jest.resetAllMocks();
+    jest.clearAllMocks();
+  });
+
   it('Finds Python if it is installed', async () => {
     const pythonDir: string = path.join(toolDir, 'Python', '3.0.0', 'x64');
     await io.mkdirP(pythonDir);
     fs.writeFileSync(`${pythonDir}.complete`, 'hello');
-    // This will throw if it doesn't find it in the cache (because no such version exists)
+    // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
     await finder.findPythonVersion('3.x', 'x64');
   });
 
+  it('Finds Python if it is not installed, but exists in the manifest', async () => {
+    const findSpy: jest.SpyInstance = jest.spyOn(
+      installer,
+      'findReleaseFromManifest'
+    );
+    findSpy.mockImplementation(() => <tc.IToolRelease>pythonRelease);
+
+    const installSpy: jest.SpyInstance = jest.spyOn(
+      installer,
+      'installCpythonFromRelease'
+    );
+    installSpy.mockImplementation(async () => {
+      const pythonDir: string = path.join(toolDir, 'Python', '1.2.3', 'x64');
+      await io.mkdirP(pythonDir);
+      fs.writeFileSync(`${pythonDir}.complete`, 'hello');
+    });
+    // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
+    await finder.findPythonVersion('1.2.3', 'x64');
+  });
+
   it('Errors if Python is not installed', async () => {
-    // This will throw if it doesn't find it in the cache (because no such version exists)
+    // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
     let thrown = false;
     try {
       await finder.findPythonVersion('3.300000', 'x64');

action.yml

@@ -8,7 +8,9 @@ inputs:
     default: '3.x'
   architecture:
     description: 'The target architecture (x86, x64) of the Python interpreter.'
-    default: 'x64'
+  token:
+    description: Used to pull python distributions from actions/python-versions. Since there's a default, this is typically not supplied by the user.
+    default: ${{ github.token }}
 outputs:
   python-version:
     description: "The installed python version. Useful when given a version range as input."