test: use random port for ng serve e2e tests

tests/legacy-cli/e2e/tests/basic/rebuild.ts

@@ -7,12 +7,15 @@ import {
 import { writeFile, writeMultipleFiles } from '../../utils/fs';
 import { wait } from '../../utils/utils';
 import fetch from 'node-fetch';
+import { findFreePort } from '../../utils/network';
 
 const validBundleRegEx = / Compiled successfully./;
 
-export default function () {
+export default async function () {
+  const port = await findFreePort();
+
   return (
-    execAndWaitForOutputToMatch('ng', ['serve'], validBundleRegEx)
+    execAndWaitForOutputToMatch('ng', ['serve', '--port', String(port)], validBundleRegEx)
       // Add a lazy module.
       .then(() => ng('generate', 'module', 'lazy', '--routing'))
       // Should trigger a rebuild with a new bundle.
@@ -136,7 +139,7 @@ export default function () {
         ]),
       )
       .then(() => wait(2000))
-      .then(() => fetch('http://localhost:4200/main.js'))
+      .then(() => fetch(`http://localhost:${port}/main.js`))
       .then((response) => response.text())
       .then((body) => {
         if (!body.match(/\$\$_E2E_GOLDEN_VALUE_1/)) {
@@ -158,7 +161,7 @@ export default function () {
         ]),
       )
       .then(() => wait(2000))
-      .then(() => fetch('http://localhost:4200/main.js'))
+      .then(() => fetch(`http://localhost:${port}/main.js`))
       .then((response) => response.text())
       .then((body) => {
         if (!body.match(/testingTESTING123/)) {
@@ -174,7 +177,7 @@ export default function () {
         ]),
       )
       .then(() => wait(2000))
-      .then(() => fetch('http://localhost:4200/main.js'))
+      .then(() => fetch(`http://localhost:${port}/main.js`))
       .then((response) => response.text())
       .then((body) => {
         if (!body.match(/color:\s?blue/)) {

tests/legacy-cli/e2e/tests/basic/serve.ts

@@ -5,20 +5,20 @@ import { ngServe } from '../../utils/project';
 export default async function () {
   try {
     // Serve works without HMR
-    await ngServe('--no-hmr');
-    await verifyResponse();
+    const noHmrPort = await ngServe('--no-hmr');
+    await verifyResponse(noHmrPort);
     await killAllProcesses();
 
     // Serve works with HMR
-    await ngServe('--hmr');
-    await verifyResponse();
+    const hmrPort = await ngServe('--hmr');
+    await verifyResponse(hmrPort);
   } finally {
     await killAllProcesses();
   }
 }
 
-async function verifyResponse(): Promise<void> {
-  const response = await fetch('http://localhost:4200/');
+async function verifyResponse(port: number): Promise<void> {
+  const response = await fetch(`http://localhost:${port}/`);
 
   if (!/<app-root><\/app-root>/.test(await response.text())) {
     throw new Error('Response does not match expected value.');

tests/legacy-cli/e2e/tests/commands/serve/serve-path.ts

@@ -3,17 +3,18 @@ import fetch from 'node-fetch';
 import { killAllProcesses } from '../../../utils/process';
 import { ngServe } from '../../../utils/project';
 
-export default function () {
+export default async function () {
   // TODO(architect): Delete this test. It is now in devkit/build-angular.
 
+  const port = await ngServe('--serve-path', 'test/');
+
   return Promise.resolve()
-    .then(() => ngServe('--serve-path', 'test/'))
-    .then(() => fetch('http://localhost:4200/test', { headers: { 'Accept': 'text/html' } }))
+    .then(() => fetch(`http://localhost:${port}/test`, { headers: { 'Accept': 'text/html' } }))
     .then(async (response) => {
       assert.strictEqual(response.status, 200);
       assert.match(await response.text(), /<app-root><\/app-root>/);
     })
-    .then(() => fetch('http://localhost:4200/test/abc', { headers: { 'Accept': 'text/html' } }))
+    .then(() => fetch(`http://localhost:${port}/test/abc`, { headers: { 'Accept': 'text/html' } }))
     .then(async (response) => {
       assert.strictEqual(response.status, 200);
       assert.match(await response.text(), /<app-root><\/app-root>/);

tests/legacy-cli/e2e/tests/misc/fallback.ts

@@ -12,7 +12,7 @@ export default function () {
   return (
     Promise.resolve()
       .then(() => ngServe())
-      .then(() => fetch('http://localhost:4200/', { headers: { 'Accept': 'text/html' } }))
+      .then((port) => fetch(`http://localhost:${port}/`, { headers: { 'Accept': 'text/html' } }))
       .then(async (response) => {
         assert.strictEqual(response.status, 200);
         assert.match(await response.text(), /<app-root><\/app-root>/);
@@ -27,7 +27,7 @@ export default function () {
         }),
       )
       .then(() => ngServe())
-      .then(() => fetch('http://localhost:4200/', { headers: { 'Accept': 'text/html' } }))
+      .then((port) => fetch(`http://localhost:${port}/`, { headers: { 'Accept': 'text/html' } }))
       .then(async (response) => {
         assert.strictEqual(response.status, 200);
         assert.match(await response.text(), /<app-root><\/app-root>/);

tests/legacy-cli/e2e/tests/misc/proxy-config.ts

@@ -34,7 +34,7 @@ export default function () {
   return Promise.resolve()
     .then(() => writeFile(proxyConfigFile, JSON.stringify(proxyConfig, null, 2)))
     .then(() => ngServe('--proxy-config', proxyConfigFile))
-    .then(() => fetch('http://localhost:4200/api/test'))
+    .then((port) => fetch(`http://localhost:${port}/api/test`))
     .then(async (response) => {
       assert.strictEqual(response.status, 200);
       assert.match(await response.text(), /TEST_API_RETURN/);

tests/legacy-cli/e2e/tests/misc/public-host.ts

@@ -11,12 +11,12 @@ export default function () {
     .filter((ni) => ni?.family === 'IPv4' && !ni?.internal)
     .map((ni) => ni!.address)
     .shift();
-  const publicHost = `${firstLocalIp}:4200`;
+  const publicHost = `${firstLocalIp}`;
   const localAddress = `http://${publicHost}`;
 
   return Promise.resolve()
     .then(() => ngServe('--host=0.0.0.0', `--public-host=${publicHost}`))
-    .then(() => fetch(localAddress))
+    .then((port) => fetch(`${localAddress}:${port}`))
     .then((response) => response.text())
     .then((body) => {
       if (!body.match(/<app-root><\/app-root>/)) {
@@ -25,7 +25,7 @@ export default function () {
     })
     .then(() => killAllProcesses())
     .then(() => ngServe('--host=0.0.0.0', `--disable-host-check`))
-    .then(() => fetch(localAddress))
+    .then((port) => fetch(`${localAddress}:${port}`))
     .then((response) => response.text())
     .then((body) => {
       if (!body.match(/<app-root><\/app-root>/)) {
@@ -35,7 +35,7 @@ export default function () {
 
     .then(() => killAllProcesses())
     .then(() => ngServe('--host=0.0.0.0', `--public-host=${localAddress}`))
-    .then(() => fetch(localAddress))
+    .then((port) => fetch(`${localAddress}:${port}`))
     .then((response) => response.text())
     .then((body) => {
       if (!body.match(/<app-root><\/app-root>/)) {
@@ -44,7 +44,7 @@ export default function () {
     })
     .then(() => killAllProcesses())
     .then(() => ngServe('--host=0.0.0.0', `--public-host=${firstLocalIp}`))
-    .then(() => fetch(localAddress))
+    .then((port) => fetch(`${localAddress}:${port}`))
     .then((response) => response.text())
     .then((body) => {
       if (!body.match(/<app-root><\/app-root>/)) {

tests/legacy-cli/e2e/tests/misc/ssl-default.ts

@@ -8,9 +8,9 @@ export default async function () {
   // TODO(architect): Delete this test. It is now in devkit/build-angular.
 
   try {
-    await ngServe('--ssl', 'true');
+    const port = await ngServe('--ssl', 'true');
 
-    const response = await fetch('https://localhost:4200/', {
+    const response = await fetch(`https://localhost:${port}/`, {
       agent: new Agent({ rejectUnauthorized: false }),
     });
 

tests/legacy-cli/e2e/tests/misc/ssl-with-cert.ts

@@ -9,7 +9,7 @@ export default async function () {
   // TODO(architect): Delete this test. It is now in devkit/build-angular.
 
   try {
-    await ngServe(
+    const port = await ngServe(
       '--ssl',
       'true',
       '--ssl-key',
@@ -18,7 +18,7 @@ export default async function () {
       assetDir('ssl/server.crt'),
     );
 
-    const response = await fetch('https://localhost:4200/', {
+    const response = await fetch(`https://localhost:${port}/`, {
       agent: new Agent({ rejectUnauthorized: false }),
     });
 

tests/legacy-cli/e2e/utils/network.ts

@@ -0,0 +1,13 @@
+import { AddressInfo, createServer } from 'net';
+
+export function findFreePort() {
+  return new Promise<number>((resolve, reject) => {
+    const srv = createServer();
+    srv.once('listening', () => {
+      const port = (srv.address() as AddressInfo).port;
+      srv.close((e) => (e ? reject(e) : resolve(port)));
+    });
+    srv.once('error', (e) => srv.close(() => reject(e)));
+    srv.listen();
+  });
+}

tests/legacy-cli/e2e/utils/project.ts

@@ -6,6 +6,7 @@ import { packages } from '../../../../lib/packages';
 import { getGlobalVariable } from './env';
 import { prependToFile, readFile, replaceInFile, writeFile } from './fs';
 import { gitCommit } from './git';
+import { findFreePort } from './network';
 import { installWorkspacePackages } from './packages';
 import { exec, execAndWaitForOutputToMatch, git, ng } from './process';
 
@@ -23,8 +24,16 @@ export function updateTsConfig(fn: (json: any) => any | void) {
   return updateJsonFile('tsconfig.json', fn);
 }
 
-export function ngServe(...args: string[]) {
-  return execAndWaitForOutputToMatch('ng', ['serve', ...args], / Compiled successfully./);
+export async function ngServe(...args: string[]) {
+  const port = await findFreePort();
+
+  await execAndWaitForOutputToMatch(
+    'ng',
+    ['serve', '--port', String(port), ...args],
+    / Compiled successfully./,
+  );
+
+  return port;
 }
 export async function prepareProjectForE2e(name: string) {
   const argv: yargsParser.Arguments = getGlobalVariable('argv');

tests/legacy-cli/e2e_runner.ts

@@ -7,9 +7,9 @@ import * as path from 'path';
 import { getGlobalVariable, setGlobalVariable } from './e2e/utils/env';
 import { gitClean } from './e2e/utils/git';
 import { createNpmRegistry } from './e2e/utils/registry';
-import { AddressInfo, createServer } from 'net';
 import { launchTestProcess } from './e2e/utils/process';
 import { join } from 'path';
+import { findFreePort } from './e2e/utils/network';
 
 Error.stackTraceLimit = Infinity;
 
@@ -254,15 +254,3 @@ function printFooter(testName: string, type: 'setup' | 'initializer' | 'test', s
   console.log(colors.green(`Last ${type} took `) + colors.bold.blue('' + t) + colors.green('s...'));
   console.log('');
 }
-
-function findFreePort() {
-  return new Promise<number>((resolve, reject) => {
-    const srv = createServer();
-    srv.once('listening', () => {
-      const port = (srv.address() as AddressInfo).port;
-      srv.close((e) => (e ? reject(e) : resolve(port)));
-    });
-    srv.once('error', (e) => srv.close(() => reject(e)));
-    srv.listen();
-  });
-}