Clean up from review and add nock for test validation

Author: implausible

__tests__/__fixtures__/mock-node-v8.8.0-linux-x86.tar.gz

@@ -1,5 +1,6 @@
 import io = require('@actions/io');
 import fs = require('fs');
+import nock = require('nock');
 import os = require('os');
 import path = require('path');
 
@@ -36,6 +37,10 @@ describe('installer tests', () => {
     await io.rmRF(tempDir);
   }, 100000);
 
+  beforeEach(() => {
+    nock.cleanAll();
+  });
+
   it('Acquires version of node if no matching version is installed', async () => {
     await installer.getNode('10.16.0');
     const nodeDir = path.join(toolDir, 'node', '10.16.0', os.arch());
@@ -123,9 +128,25 @@ describe('installer tests', () => {
 
   it('Acquires specified x86 version of node if no matching version is installed', async () => {
     const arch = 'x86';
-    await installer.getNode('8.8.1', arch);
-    const nodeDir = path.join(toolDir, 'node', '8.8.1', arch);
-
+    const version = '8.8.0';
+    const fileExtension = IS_WINDOWS ? '7z' : 'tar.gz';
+    const platform = {
+      linux: 'linux',
+      darwin: 'darwin',
+      win32: 'win'
+    }[process.platform];
+    const fileName = `node-v${version}-${platform}-${arch}.${fileExtension}`;
+    const pathOnNodeJs = `/dist/v${version}/${fileName}`;
+    const scope = nock('https://nodejs.org')
+      .get(pathOnNodeJs)
+      .replyWithFile(
+        200,
+        path.join(__dirname, '__fixtures__', `mock-${fileName}`)
+      );
+    await installer.getNode(version, arch);
+    const nodeDir = path.join(toolDir, 'node', version, arch);
+
+    expect(scope.isDone()).toBe(true);
     expect(fs.existsSync(`${nodeDir}.complete`)).toBe(true);
     if (IS_WINDOWS) {
       expect(fs.existsSync(path.join(nodeDir, 'node.exe'))).toBe(true);
@@ -136,9 +157,25 @@ describe('installer tests', () => {
 
   it('Acquires specified x64 version of node if no matching version is installed', async () => {
     const arch = 'x64';
-    await installer.getNode('8.8.1', arch);
-    const nodeDir = path.join(toolDir, 'node', '8.8.1', arch);
-
+    const version = '8.9.1';
+    const fileExtension = IS_WINDOWS ? '7z' : 'tar.gz';
+    const platform = {
+      linux: 'linux',
+      darwin: 'darwin',
+      win32: 'win'
+    }[process.platform];
+    const fileName = `node-v${version}-${platform}-${arch}.${fileExtension}`;
+    const pathOnNodeJs = `/dist/v${version}/${fileName}`;
+    const scope = nock('https://nodejs.org')
+      .get(pathOnNodeJs)
+      .replyWithFile(
+        200,
+        path.join(__dirname, '__fixtures__', `mock-${fileName}`)
+      );
+    await installer.getNode(version, arch);
+    const nodeDir = path.join(toolDir, 'node', version, arch);
+
+    expect(scope.isDone()).toBe(true);
     expect(fs.existsSync(`${nodeDir}.complete`)).toBe(true);
     if (IS_WINDOWS) {
       expect(fs.existsSync(path.join(nodeDir, 'node.exe'))).toBe(true);

__tests__/__fixtures__/mock-node-v8.8.0-win-x86.7z

@@ -31,8 +31,8 @@ function run() {
             if (!version) {
                 version = core.getInput('node-version');
             }
-            const osArch = core.getInput('node-arch') || os.arch();
             if (version) {
+                const osArch = core.getInput('node-arch') || os.arch();
                 // TODO: installer doesn't support proxy
                 yield installer.getNode(version, osArch);
             }

__tests__/__fixtures__/mock-node-v8.9.1-linux-x64.tar.gz

@@ -26,8 +26,8 @@
     "@actions/github": "^1.0.0",
     "@actions/io": "^1.0.0",
     "@actions/tool-cache": "^1.0.0",
-    "typed-rest-client": "^1.5.0",
-    "semver": "^6.1.1"
+    "semver": "^6.1.1",
+    "typed-rest-client": "^1.5.0"
   },
   "devDependencies": {
     "@types/jest": "^24.0.13",
@@ -36,6 +36,7 @@
     "husky": "^2.3.0",
     "jest": "^24.8.0",
     "jest-circus": "^24.7.1",
+    "nock": "^11.3.5",
     "prettier": "^1.17.1",
     "ts-jest": "^24.0.2",
     "typescript": "^3.5.1"

__tests__/__fixtures__/mock-node-v8.9.1-win-x64.7z

@@ -14,8 +14,9 @@ async function run() {
     if (!version) {
       version = core.getInput('node-version');
     }
-    const osArch = core.getInput('node-arch') || os.arch();
+
     if (version) {
+      const osArch = core.getInput('node-arch') || os.arch();
       // TODO: installer doesn't support proxy
       await installer.getNode(version, osArch);
     }