diff --git a/globalSetupTest.js b/globalSetupTest.js
new file mode 100644
index 0000000000..1e4123b5fa
--- /dev/null
+++ b/globalSetupTest.js
@@ -0,0 +1,31 @@
+'use strict';
+
+// eslint-disable-next-line import/no-extraneous-dependencies
+const tcpPortUsed = require('tcp-port-used');
+const ports = require('./test/ports-map');
+
+async function validatePorts() {
+  const samples = [];
+
+  Object.entries(ports).forEach(([key, value]) => {
+    const arr = Array.isArray(value) ? value : [value];
+
+    arr.forEach((port) => {
+      const check = tcpPortUsed.check(port, 'localhost').then((inUse) => {
+        if (inUse) throw new Error(`${port} has already used. [${key}]`);
+      });
+
+      samples.push(check);
+    });
+  });
+
+  try {
+    await Promise.all(samples);
+  } catch (e) {
+    // eslint-disable-next-line no-console
+    console.error(e);
+    process.exit(1);
+  }
+}
+
+module.exports = validatePorts;
diff --git a/jest.config.js b/jest.config.js
index 322de40ff2..47f4bfd4e7 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -7,4 +7,5 @@ module.exports = {
   moduleFileExtensions: ['js', 'json'],
   testMatch: ['**/test/**/*.test.js'],
   setupFilesAfterEnv: ['<rootDir>/setupTest.js'],
+  globalSetup: '<rootDir>/globalSetupTest.js',
 };
diff --git a/package-lock.json b/package-lock.json
index 00a5b64e9e..3d8dd0183d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5416,8 +5416,7 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -5438,14 +5437,12 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -5460,20 +5457,17 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -5590,8 +5584,7 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "ini": {
           "version": "1.3.5",
@@ -5603,7 +5596,6 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -5618,7 +5610,6 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -5626,14 +5617,12 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -5652,7 +5641,6 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -5733,8 +5721,7 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -5746,7 +5733,6 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5832,8 +5818,7 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -5869,7 +5854,6 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -5889,7 +5873,6 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -5933,14 +5916,12 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         }
       }
     },
@@ -7304,6 +7285,12 @@
       "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo=",
       "dev": true
     },
+    "is-url": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/is-url/-/is-url-1.2.4.tgz",
+      "integrity": "sha512-ITvGim8FhRiYe4IQ5uHSkj7pVaPDrCTkNd3yq3cV7iZAcJdHTUMPMEHcqSOy9xZ9qFenQCvi+2wjH9a1nXqHww==",
+      "dev": true
+    },
     "is-utf8": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/is-utf8/-/is-utf8-0.2.1.tgz",
@@ -7320,6 +7307,17 @@
       "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
       "integrity": "sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0="
     },
+    "is2": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/is2/-/is2-2.0.1.tgz",
+      "integrity": "sha512-+WaJvnaA7aJySz2q/8sLjMb2Mw14KTplHmSwcSpZ/fWJPkUmqw3YTzSWbPJ7OAwRvdYTWF2Wg+yYJ1AdP5Z8CA==",
+      "dev": true,
+      "requires": {
+        "deep-is": "^0.1.3",
+        "ip-regex": "^2.1.0",
+        "is-url": "^1.2.2"
+      }
+    },
     "isarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
@@ -11505,6 +11503,33 @@
       "integrity": "sha512-4WK/bYZmj8xLr+HUCODHGF1ZFzsYffasLUgEiMBY4fgtltdO6B4WJtlSbPaDTLpYTcGVwM2qLnFTICEcNxs3kA==",
       "dev": true
     },
+    "tcp-port-used": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tcp-port-used/-/tcp-port-used-1.0.1.tgz",
+      "integrity": "sha512-rwi5xJeU6utXoEIiMvVBMc9eJ2/ofzB+7nLOdnZuFTmNCLqRiQh2sMG9MqCxHU/69VC/Fwp5dV9306Qd54ll1Q==",
+      "dev": true,
+      "requires": {
+        "debug": "4.1.0",
+        "is2": "2.0.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.0.tgz",
+          "integrity": "sha512-heNPJUJIqC+xB6ayLAMHaIrmN9HKa7aQO8MGqKpvCA+uJYVcvR6l5kgdrhRuwPFHU7P5/A1w0BjByPHwpfTDKg==",
+          "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
+        }
+      }
+    },
     "terser": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/terser/-/terser-4.0.0.tgz",
diff --git a/package.json b/package.json
index acc6a6041c..4b312c9109 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "lint": "npm-run-all -l -p \"lint:**\"",
     "commitlint": "commitlint --from=master",
     "security": "npm audit",
-    "test:only": "jest --runInBand",
+    "test:only": "jest",
     "test:coverage": "npm run test:only -- --coverage",
     "test:watch": "npm run test:coverage --watch",
     "test": "npm run test:coverage",
@@ -103,6 +103,7 @@
     "standard-version": "^6.0.1",
     "style-loader": "^0.23.1",
     "supertest": "^4.0.2",
+    "tcp-port-used": "^1.0.1",
     "url-loader": "^2.0.0",
     "webpack": "^4.33.0",
     "webpack-cli": "^3.3.3",
diff --git a/test/cli/cli.test.js b/test/cli/cli.test.js
index 65b38dab4b..404cff789c 100644
--- a/test/cli/cli.test.js
+++ b/test/cli/cli.test.js
@@ -128,8 +128,10 @@ describe('CLI', () => {
     const cliPath = resolve(__dirname, '../../bin/webpack-dev-server.js');
     const examplePath = resolve(__dirname, '../../examples/cli/public');
 
-    const cp = execa('node', [cliPath], { cwd: examplePath });
-    const cp2 = execa('node', [cliPath], { cwd: examplePath });
+    const cp = execa('node', [cliPath, '--colors=false'], { cwd: examplePath });
+    const cp2 = execa('node', [cliPath, '--colors=false'], {
+      cwd: examplePath,
+    });
 
     const runtime = {
       cp: {
diff --git a/test/client/clients/SockJSClient.test.js b/test/client/clients/SockJSClient.test.js
index 2aed40499e..62817459da 100644
--- a/test/client/clients/SockJSClient.test.js
+++ b/test/client/clients/SockJSClient.test.js
@@ -5,6 +5,7 @@ const express = require('express');
 const sockjs = require('sockjs');
 const SockJSClient = require('../../../client-src/clients/SockJSClient');
 const timer = require('../../helpers/timer');
+const port = require('../../ports-map').sockJSClient;
 
 describe('SockJSClient', () => {
   let socketServer;
@@ -15,7 +16,7 @@ describe('SockJSClient', () => {
     const app = new express();
 
     listeningApp = http.createServer(app);
-    listeningApp.listen(8080, 'localhost', () => {
+    listeningApp.listen(port, 'localhost', () => {
       socketServer = sockjs.createServer();
       socketServer.installHandlers(listeningApp, {
         prefix: '/sockjs-node',
@@ -33,7 +34,7 @@ describe('SockJSClient', () => {
         connection.close();
       });
 
-      const client = new SockJSClient('http://localhost:8080/sockjs-node');
+      const client = new SockJSClient(`http://localhost:${port}/sockjs-node`);
       const data = [];
 
       client.onOpen(() => {
diff --git a/test/e2e/Client.test.js b/test/e2e/Client.test.js
index d5e16e0cf6..3b15a29d18 100644
--- a/test/e2e/Client.test.js
+++ b/test/e2e/Client.test.js
@@ -9,6 +9,7 @@ const reloadConfig = require('../fixtures/reload-config/webpack.config');
 const { writeAsync } = require('../helpers/fs');
 const testServer = require('../helpers/test-server');
 const runBrowser = require('../helpers/run-browser');
+const port = require('../ports-map').Client;
 
 const cssFilePath = resolve(__dirname, '../fixtures/reload-config/main.css');
 
@@ -20,7 +21,7 @@ describe('reload', () => {
         'body { background-color: rgb(0, 0, 255); }'
       );
       const options = {
-        port: 9000,
+        port,
         host: '0.0.0.0',
         inline: true,
         hot: true,
@@ -41,7 +42,7 @@ describe('reload', () => {
         const { page, browser } = await runBrowser();
         let refreshed = false;
 
-        page.goto('http://localhost:9000/main');
+        page.goto(`http://localhost:${port}/main`);
         await page.waitForNavigation({ waitUntil: 'load' });
 
         {
@@ -59,7 +60,7 @@ describe('reload', () => {
           if (
             req.isNavigationRequest() &&
             req.frame() === page.mainFrame() &&
-            req.url() === 'http://localhost:9000/main'
+            req.url() === `http://localhost:${port}/main`
           ) {
             refreshed = true;
           }
diff --git a/test/e2e/ClientOptions.test.js b/test/e2e/ClientOptions.test.js
index fed3492343..d37f66fe03 100644
--- a/test/e2e/ClientOptions.test.js
+++ b/test/e2e/ClientOptions.test.js
@@ -7,6 +7,7 @@ const testServer = require('../helpers/test-server');
 const config = require('../fixtures/client-config/webpack.config');
 const runBrowser = require('../helpers/run-browser');
 const timer = require('../helpers/timer');
+const [port1, port2, port3] = require('../ports-map').ClientOptions;
 
 describe('Client code', () => {
   function startProxy(port) {
@@ -14,7 +15,7 @@ describe('Client code', () => {
     proxy.use(
       '/',
       httpProxy({
-        target: 'http://localhost:9001',
+        target: `http://localhost:${port1}`,
         ws: true,
         changeOrigin: true,
       })
@@ -25,7 +26,7 @@ describe('Client code', () => {
   beforeAll((done) => {
     const options = {
       compress: true,
-      port: 9001,
+      port: port1,
       host: '0.0.0.0',
       disableHostCheck: true,
       inline: true,
@@ -39,12 +40,12 @@ describe('Client code', () => {
 
   afterAll(testServer.close);
 
-  // [HPM] Proxy created: /  ->  http://localhost:9001
+  // [HPM] Proxy created: /  ->  http://localhost:{port1}
   describe('behind a proxy', () => {
     let proxy;
 
     beforeAll(() => {
-      proxy = startProxy(9000);
+      proxy = startProxy(port2);
     });
 
     afterAll((done) => {
@@ -54,10 +55,10 @@ describe('Client code', () => {
     });
 
     it('responds with a 200', async () => {
-      await request('http://localhost:9000')
+      await request(`http://localhost:${port2}`)
         .get('/sockjs-node')
         .expect(200, 'Welcome to SockJS!\n');
-      await request('http://localhost:9001')
+      await request(`http://localhost:${port1}`)
         .get('/sockjs-node')
         .expect(200, 'Welcome to SockJS!\n');
     });
@@ -65,13 +66,15 @@ describe('Client code', () => {
     it('requests websocket through the proxy with proper port number', async () => {
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
 
       const req = await page.waitForRequest((requestObj) =>
         requestObj.url().match(/sockjs-node/)
       );
 
-      expect(req.url()).toMatch(/^http:\/\/localhost:9001\/sockjs-node/);
+      expect(
+        req.url().includes(`http://localhost:${port1}/sockjs-node`)
+      ).toBeTruthy();
 
       await browser.close();
     });
@@ -81,7 +84,7 @@ describe('Client code', () => {
 describe('Client complex inline script path', () => {
   beforeAll((done) => {
     const options = {
-      port: 9000,
+      port: port2,
       host: '0.0.0.0',
       inline: true,
       watchOptions: {
@@ -99,13 +102,15 @@ describe('Client complex inline script path', () => {
     it('uses the correct public hostname and sockPath', async () => {
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
 
       const req = await page.waitForRequest((requestObj) =>
         requestObj.url().match(/foo\/test\/bar/)
       );
 
-      expect(req.url()).toMatch(/^http:\/\/myhost\.test:9000\/foo\/test\/bar/);
+      expect(
+        req.url().includes(`http://myhost.test:${port2}/foo/test/bar/`)
+      ).toBeTruthy();
 
       await browser.close();
     });
@@ -115,14 +120,14 @@ describe('Client complex inline script path', () => {
 describe('Client complex inline script path with sockPort', () => {
   beforeAll((done) => {
     const options = {
-      port: 9000,
+      port: port2,
       host: '0.0.0.0',
       inline: true,
       watchOptions: {
         poll: true,
       },
       sockPath: '/foo/test/bar/',
-      sockPort: 8080,
+      sockPort: port3,
     };
     testServer.startAwaitingCompilation(config, options, done);
   });
@@ -133,13 +138,15 @@ describe('Client complex inline script path with sockPort', () => {
     it('uses the correct sockPort', async () => {
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
 
       const req = await page.waitForRequest((requestObj) =>
         requestObj.url().match(/foo\/test\/bar/)
       );
 
-      expect(req.url()).toMatch(/^http:\/\/localhost:8080\/foo\/test\/bar/);
+      expect(
+        req.url().includes(`http://localhost:${port3}/foo/test/bar`)
+      ).toBeTruthy();
 
       await browser.close();
     });
@@ -152,13 +159,13 @@ describe('Client complex inline script path with sockPort', () => {
 describe('Client complex inline script path with sockPort, no sockPath', () => {
   beforeAll((done) => {
     const options = {
-      port: 9000,
+      port: port2,
       host: '0.0.0.0',
       inline: true,
       watchOptions: {
         poll: true,
       },
-      sockPort: 8080,
+      sockPort: port3,
     };
     testServer.startAwaitingCompilation(config, options, done);
   });
@@ -169,13 +176,15 @@ describe('Client complex inline script path with sockPort, no sockPath', () => {
     it('uses the correct sockPort and sockPath', async () => {
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
 
       const req = await page.waitForRequest((requestObj) =>
         requestObj.url().match(/sockjs-node/)
       );
 
-      expect(req.url()).toMatch(/^http:\/\/localhost:8080\/sockjs-node/);
+      expect(
+        req.url().includes(`http://localhost:${port3}/sockjs-node`)
+      ).toBeTruthy();
 
       await browser.close();
     });
@@ -185,7 +194,7 @@ describe('Client complex inline script path with sockPort, no sockPath', () => {
 describe('Client complex inline script path with sockHost', () => {
   beforeAll((done) => {
     const options = {
-      port: 9000,
+      port: port2,
       host: '0.0.0.0',
       inline: true,
       watchOptions: {
@@ -202,13 +211,15 @@ describe('Client complex inline script path with sockHost', () => {
     it('uses the correct sockHost', async () => {
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
 
       const req = await page.waitForRequest((requestObj) =>
         requestObj.url().match(/sockjs-node/)
       );
 
-      expect(req.url()).toMatch(/^http:\/\/myhost\.test:9000\/sockjs-node/);
+      expect(
+        req.url().includes(`http://myhost.test:${port2}/sockjs-node`)
+      ).toBeTruthy();
 
       await browser.close();
     });
@@ -217,7 +228,7 @@ describe('Client complex inline script path with sockHost', () => {
 
 describe('Client console.log', () => {
   const baseOptions = {
-    port: 9000,
+    port: port2,
     host: '0.0.0.0',
   };
   const cases = [
@@ -265,12 +276,12 @@ describe('Client console.log', () => {
 
       const { page, browser } = await runBrowser();
 
-      page.goto('http://localhost:9000/main');
+      page.goto(`http://localhost:${port2}/main`);
       page.on('console', ({ _text }) => {
         res.push(_text);
       });
 
-      await timer(3000);
+      await timer(1000);
 
       expect(res).toMatchSnapshot();
       await browser.close();
diff --git a/test/integration/MultiCompiler.test.js b/test/integration/MultiCompiler.test.js
index 109e9d8060..d35fe9ba78 100644
--- a/test/integration/MultiCompiler.test.js
+++ b/test/integration/MultiCompiler.test.js
@@ -3,13 +3,14 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/multi-compiler-config/webpack.config');
+const port = require('../ports-map').MultiCompiler;
 
 describe('multi compiler', () => {
   let server;
   let req;
 
   beforeAll((done) => {
-    server = testServer.start(config, {}, done);
+    server = testServer.start(config, { port }, done);
     req = request(server.app);
   });
 
diff --git a/test/integration/UniversalCompiler.test.js b/test/integration/UniversalCompiler.test.js
index f7d6caab2b..3ae2c3bd7a 100644
--- a/test/integration/UniversalCompiler.test.js
+++ b/test/integration/UniversalCompiler.test.js
@@ -3,13 +3,14 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/universal-compiler-config/webpack.config');
+const port = require('../ports-map').UniversalCompiler;
 
 describe('universal compiler', () => {
   let server;
   let req;
 
   beforeAll((done) => {
-    server = testServer.start(config, { inline: true }, done);
+    server = testServer.start(config, { inline: true, port }, done);
     req = request(server.app);
   });
 
diff --git a/test/ports-map.js b/test/ports-map.js
new file mode 100644
index 0000000000..f39661bc0b
--- /dev/null
+++ b/test/ports-map.js
@@ -0,0 +1,49 @@
+'use strict';
+
+// test-file-name: the number of ports
+const portsList = {
+  cli: 2,
+  sockJSClient: 1,
+  SockJSServer: 1,
+  Client: 1,
+  ClientOptions: 3,
+  MultiCompiler: 1,
+  UniversalCompiler: 1,
+  Server: 1,
+  routes: 1,
+  createDomain: 2,
+  'after-option': 1,
+  'before-option': 1,
+  'compress-option': 1,
+  'contentBase-option': 1,
+  'headers-option': 1,
+  'historyApiFallback-option': 1,
+  'host-option': 1,
+  'hot-option': 1,
+  'hotOnly-option': 1,
+  'http2-option': 1,
+  'https-option': 1,
+  'inline-option': 1,
+  'lazy-option': 1,
+  'liveReload-option': 1,
+  'mineTypes-option': 1,
+  'onListening-option': 1,
+  'open-option': 1,
+  'port-option': 1,
+  'proxy-option': 4,
+  'serverMode-option': 1,
+  'sockPath-option': 1,
+  'stats-option': 1,
+};
+
+let startPort = 8079;
+const ports = {};
+
+Object.entries(portsList).forEach(([key, value]) => {
+  ports[key] =
+    value === 1
+      ? (startPort += 1)
+      : [...new Array(value)].map(() => (startPort += 1));
+});
+
+module.exports = ports;
diff --git a/test/server/Server.test.js b/test/server/Server.test.js
index b2b44731e2..487942e212 100644
--- a/test/server/Server.test.js
+++ b/test/server/Server.test.js
@@ -6,6 +6,7 @@ const sockjs = require('sockjs/lib/transport');
 const { noop } = require('webpack-dev-middleware/lib/util');
 const Server = require('../../lib/Server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map').Server;
 
 jest.mock('sockjs/lib/transport');
 
@@ -23,6 +24,7 @@ describe('Server', () => {
       const compiler = webpack(config);
       const server = new Server(compiler, {
         hot: true,
+        port,
       });
 
       expect(
@@ -45,6 +47,7 @@ describe('Server', () => {
       const compiler = webpack(config);
       const server = new Server(compiler, {
         hotOnly: true,
+        port,
       });
 
       expect(
@@ -92,7 +95,7 @@ describe('Server', () => {
       });
 
       const compiler = webpack(config);
-      const server = new Server(compiler);
+      const server = new Server(compiler, { port });
 
       compiler.hooks.done.tap('webpack-dev-server', (s) => {
         const output = server.getStats(s);
@@ -102,7 +105,7 @@ describe('Server', () => {
       });
 
       compiler.run(() => {});
-      server.listen(8080, 'localhost');
+      server.listen(port, 'localhost');
     });
   });
 
@@ -136,7 +139,7 @@ describe('Server', () => {
     describe('Testing callback functions on calling invalidate without callback', () => {
       it('should be `noop` (the default callback function)', (done) => {
         const compiler = webpack(config);
-        const server = new Server(compiler);
+        const server = new Server(compiler, { port });
 
         server.invalidate();
         expect(server.middleware.context.callbacks[0]).toBe(noop);
@@ -153,7 +156,7 @@ describe('Server', () => {
       it('should be `callback` function', (done) => {
         const compiler = webpack(config);
         const callback = jest.fn();
-        const server = new Server(compiler);
+        const server = new Server(compiler, { port });
 
         server.invalidate(callback);
 
diff --git a/test/server/__snapshots__/Server.test.js.snap b/test/server/__snapshots__/Server.test.js.snap
index b606b0561f..8d2d66684b 100644
--- a/test/server/__snapshots__/Server.test.js.snap
+++ b/test/server/__snapshots__/Server.test.js.snap
@@ -5,7 +5,7 @@ Array [
   Array [
     "client",
     "index.js?http:",
-    "localhost",
+    "localhost:8090",
   ],
   Array [
     "node_modules",
@@ -35,7 +35,7 @@ Array [
   Array [
     "client",
     "index.js?http:",
-    "localhost",
+    "localhost:8090",
   ],
   Array [
     "node_modules",
diff --git a/test/server/after-option.test.js b/test/server/after-option.test.js
index 51a795fd92..07e7fd5545 100644
--- a/test/server/after-option.test.js
+++ b/test/server/after-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['after-option'];
 
 describe('after option', () => {
   let server;
@@ -29,6 +30,7 @@ describe('after option', () => {
             response.send('after');
           });
         },
+        port,
       },
       done
     );
diff --git a/test/server/before-option.test.js b/test/server/before-option.test.js
index f857ccbd87..4e831133c2 100644
--- a/test/server/before-option.test.js
+++ b/test/server/before-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['before-option'];
 
 describe('before option', () => {
   let server;
@@ -29,6 +30,7 @@ describe('before option', () => {
             response.send('before');
           });
         },
+        port,
       },
       done
     );
diff --git a/test/server/compress-option.test.js b/test/server/compress-option.test.js
index 8fe337bd73..644d40356f 100644
--- a/test/server/compress-option.test.js
+++ b/test/server/compress-option.test.js
@@ -8,6 +8,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config-other/webpack.config');
+const port = require('../ports-map')['compress-option'];
 
 describe('compress option', () => {
   let server;
@@ -15,7 +16,7 @@ describe('compress option', () => {
 
   describe('not specify', () => {
     beforeAll((done) => {
-      server = testServer.start(config, {}, done);
+      server = testServer.start(config, { port }, done);
       req = request(server.app);
     });
 
@@ -39,6 +40,7 @@ describe('compress option', () => {
         config,
         {
           compress: true,
+          port,
         },
         done
       );
@@ -61,6 +63,7 @@ describe('compress option', () => {
         config,
         {
           compress: false,
+          port,
         },
         done
       );
diff --git a/test/server/contentBase-option.test.js b/test/server/contentBase-option.test.js
index f630ee470d..00619a657a 100644
--- a/test/server/contentBase-option.test.js
+++ b/test/server/contentBase-option.test.js
@@ -5,6 +5,7 @@ const fs = require('fs');
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/contentbase-config/webpack.config');
+const port = require('../ports-map')['contentBase-option'];
 
 const contentBasePublic = path.resolve(
   __dirname,
@@ -28,6 +29,7 @@ describe('contentBase option', () => {
         {
           contentBase: contentBasePublic,
           watchContentBase: true,
+          port,
         },
         done
       );
@@ -91,6 +93,7 @@ describe('contentBase option', () => {
           contentBase: contentBasePublic,
           watchContentBase: true,
           serveIndex: false,
+          port,
         },
         done
       );
@@ -120,6 +123,7 @@ describe('contentBase option', () => {
           contentBase: contentBasePublic,
           watchContentBase: true,
           serveIndex: true,
+          port,
         },
         done
       );
@@ -146,6 +150,7 @@ describe('contentBase option', () => {
         {
           contentBase: contentBasePublic,
           watchContentBase: true,
+          port,
         },
         done
       );
@@ -171,6 +176,7 @@ describe('contentBase option', () => {
         config,
         {
           contentBase: [contentBasePublic, contentBaseOther],
+          port,
         },
         done
       );
@@ -196,6 +202,7 @@ describe('contentBase option', () => {
         config,
         {
           contentBase: 9099999,
+          port,
         },
         done
       );
@@ -220,6 +227,7 @@ describe('contentBase option', () => {
         config,
         {
           contentBase: 'http://example.com/',
+          port,
         },
         done
       );
@@ -251,7 +259,7 @@ describe('contentBase option', () => {
     beforeAll((done) => {
       jest.spyOn(process, 'cwd').mockImplementation(() => contentBasePublic);
 
-      server = testServer.start(config, {}, done);
+      server = testServer.start(config, { port }, done);
       req = request(server.app);
     });
 
@@ -274,6 +282,7 @@ describe('contentBase option', () => {
         config,
         {
           contentBase: false,
+          port,
         },
         done
       );
@@ -295,6 +304,7 @@ describe('contentBase option', () => {
         config,
         {
           contentBase: [contentBasePublic],
+          port,
         },
         done
       );
diff --git a/test/server/headers-option.test.js b/test/server/headers-option.test.js
index 394d18ff3a..1891fe01a2 100644
--- a/test/server/headers-option.test.js
+++ b/test/server/headers-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['headers-option'];
 
 describe('headers option', () => {
   let server;
@@ -14,6 +15,7 @@ describe('headers option', () => {
         config,
         {
           headers: { 'X-Foo': '1' },
+          port,
         },
         done
       );
@@ -36,6 +38,7 @@ describe('headers option', () => {
         config,
         {
           headers: { 'X-Bar': ['key1=value1', 'key2=value2'] },
+          port,
         },
         done
       );
diff --git a/test/server/historyApiFallback-option.test.js b/test/server/historyApiFallback-option.test.js
index e876004995..e76f0ea625 100644
--- a/test/server/historyApiFallback-option.test.js
+++ b/test/server/historyApiFallback-option.test.js
@@ -6,6 +6,7 @@ const testServer = require('../helpers/test-server');
 const config = require('../fixtures/historyapifallback-config/webpack.config');
 const config2 = require('../fixtures/historyapifallback-2-config/webpack.config');
 const config3 = require('../fixtures/historyapifallback-3-config/webpack.config');
+const port = require('../ports-map')['historyApiFallback-option'];
 
 describe('historyApiFallback option', () => {
   let server;
@@ -19,6 +20,7 @@ describe('historyApiFallback option', () => {
         config,
         {
           historyApiFallback: true,
+          port,
         },
         done
       );
@@ -41,6 +43,7 @@ describe('historyApiFallback option', () => {
           historyApiFallback: {
             index: '/bar.html',
           },
+          port,
         },
         done
       );
@@ -67,6 +70,7 @@ describe('historyApiFallback option', () => {
           historyApiFallback: {
             index: '/bar.html',
           },
+          port,
         },
         done
       );
@@ -113,6 +117,7 @@ describe('historyApiFallback option', () => {
           historyApiFallback: {
             index: '/bar.html',
           },
+          port,
         },
         done
       );
@@ -148,6 +153,7 @@ describe('historyApiFallback option', () => {
               },
             ],
           },
+          port,
         },
         done
       );
@@ -186,6 +192,7 @@ describe('historyApiFallback option', () => {
             '../fixtures/historyapifallback-3-config'
           ),
           historyApiFallback: true,
+          port,
         },
         done
       );
diff --git a/test/server/host-option.test.js b/test/server/host-option.test.js
index c908ba5316..667caabd9f 100644
--- a/test/server/host-option.test.js
+++ b/test/server/host-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const config = require('../fixtures/simple-config/webpack.config');
 const testServer = require('../helpers/test-server');
+const port = require('../ports-map')['host-option'];
 
 describe('host option', () => {
   let server = null;
@@ -10,7 +11,7 @@ describe('host option', () => {
 
   describe('is not be specified', () => {
     beforeAll((done) => {
-      server = testServer.start(config, {}, done);
+      server = testServer.start(config, { port }, done);
       req = request(server.app);
     });
 
@@ -18,7 +19,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('127.0.0.1');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', (done) => {
@@ -35,6 +36,7 @@ describe('host option', () => {
         {
           // eslint-disable-next-line no-undefined
           host: undefined,
+          port,
         },
         done
       );
@@ -45,7 +47,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('::');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', async () => {
@@ -61,6 +63,7 @@ describe('host option', () => {
         config,
         {
           host: null,
+          port,
         },
         done
       );
@@ -71,7 +74,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('::');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', async () => {
@@ -87,6 +90,7 @@ describe('host option', () => {
         config,
         {
           host: '127.0.0.1',
+          port,
         },
         done
       );
@@ -97,7 +101,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('127.0.0.1');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', async () => {
@@ -113,6 +117,7 @@ describe('host option', () => {
         config,
         {
           host: 'localhost',
+          port,
         },
         done
       );
@@ -123,7 +128,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('127.0.0.1');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', async () => {
@@ -139,6 +144,7 @@ describe('host option', () => {
         config,
         {
           host: '0.0.0.0',
+          port,
         },
         done
       );
@@ -149,7 +155,7 @@ describe('host option', () => {
       const address = server.listeningApp.address();
 
       expect(address.address).toBe('0.0.0.0');
-      expect(address.port).toBe(8080);
+      expect(address.port).toBe(port);
     });
 
     it('Request to index', async () => {
diff --git a/test/server/hot-option.test.js b/test/server/hot-option.test.js
index 6804b313eb..e79679ff4b 100644
--- a/test/server/hot-option.test.js
+++ b/test/server/hot-option.test.js
@@ -4,6 +4,7 @@ const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/client-config/webpack.config');
 const multiCompilerConfig = require('../fixtures/multi-compiler-config/webpack.config');
+const port = require('../ports-map')['hot-option'];
 
 describe('hot option', () => {
   let server;
@@ -12,7 +13,7 @@ describe('hot option', () => {
   describe('simple hot config entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: true,
         watchOptions: {
@@ -33,7 +34,7 @@ describe('hot option', () => {
   describe('multi compiler hot config entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: true,
         watchOptions: {
@@ -58,7 +59,7 @@ describe('hot option', () => {
   describe('hot disabled entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: false,
         watchOptions: {
@@ -85,7 +86,7 @@ describe('hot option', () => {
     it('should register the HMR plugin before compilation is complete', (done) => {
       let pluginFound = false;
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: true,
         watchOptions: {
@@ -119,7 +120,7 @@ describe('hot option', () => {
     it('should register the HMR plugin before compilation is complete', (done) => {
       let pluginFound = false;
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: true,
         watchOptions: {
@@ -153,7 +154,7 @@ describe('hot option', () => {
     it('should NOT register the HMR plugin before compilation is complete', (done) => {
       let pluginFound = false;
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hot: false,
         watchOptions: {
diff --git a/test/server/hotOnly-option.test.js b/test/server/hotOnly-option.test.js
index aa15ef5b39..61cba1eb88 100644
--- a/test/server/hotOnly-option.test.js
+++ b/test/server/hotOnly-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/client-config/webpack.config');
+const port = require('../ports-map')['hotOnly-option'];
 
 describe('hotOnly options', () => {
   let server;
@@ -11,7 +12,7 @@ describe('hotOnly options', () => {
   describe('simple hotOnly config entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hotOnly: true,
         watchOptions: {
@@ -35,7 +36,7 @@ describe('hotOnly options', () => {
     it('should register the HMR plugin before compilation is complete', (done) => {
       let pluginFound = false;
       const options = {
-        port: 9000,
+        port,
         inline: true,
         hotOnly: true,
         watchOptions: {
diff --git a/test/server/http2-option.test.js b/test/server/http2-option.test.js
index ee05992483..eee2862848 100644
--- a/test/server/http2-option.test.js
+++ b/test/server/http2-option.test.js
@@ -5,6 +5,7 @@ const request = require('supertest');
 const semver = require('semver');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/contentbase-config/webpack.config');
+const port = require('../ports-map')['http2-option'];
 
 const contentBasePublic = path.resolve(
   __dirname,
@@ -37,6 +38,7 @@ describe('http2 option', () => {
             contentBase: contentBasePublic,
             https: true,
             http2: true,
+            port,
           },
           done
         );
@@ -44,7 +46,7 @@ describe('http2 option', () => {
       });
 
       it('confirm http2 client can connect', (done) => {
-        const client = http2.connect('https://localhost:8080', {
+        const client = http2.connect(`https://localhost:${port}`, {
           rejectUnauthorized: false,
         });
         client.on('error', (err) => console.error(err));
@@ -78,6 +80,7 @@ describe('http2 option', () => {
         {
           contentBase: contentBasePublic,
           http2: true,
+          port,
         },
         done
       );
@@ -99,6 +102,7 @@ describe('http2 option', () => {
           contentBase: contentBasePublic,
           https: true,
           http2: false,
+          port,
         },
         done
       );
diff --git a/test/server/https-option.test.js b/test/server/https-option.test.js
index 5dcd2964aa..2c569ea5df 100644
--- a/test/server/https-option.test.js
+++ b/test/server/https-option.test.js
@@ -5,8 +5,8 @@ const fs = require('fs');
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/contentbase-config/webpack.config');
-const skipTestOnWindows = require('../helpers/conditional-test')
-  .skipTestOnWindows;
+const { skipTestOnWindows } = require('../helpers/conditional-test');
+const port = require('../ports-map')['https-option'];
 
 const httpsCertificateDirectory = path.resolve(
   __dirname,
@@ -28,6 +28,7 @@ describe('https option', () => {
         {
           contentBase: contentBasePublic,
           https: true,
+          port,
         },
         done
       );
@@ -62,6 +63,7 @@ describe('https option', () => {
             ),
             passphrase: 'webpack-dev-server',
           },
+          port,
         },
         done
       );
@@ -86,6 +88,7 @@ describe('https option', () => {
             cert: path.join(httpsCertificateDirectory, 'server.crt'),
             passphrase: 'webpack-dev-server',
           },
+          port,
         },
         done
       );
@@ -114,6 +117,7 @@ describe('https option', () => {
             cert: path.join(httpsCertificateDirectory, 'server-symlink.crt'),
             passphrase: 'webpack-dev-server',
           },
+          port,
         },
         done
       );
@@ -149,6 +153,7 @@ describe('https option', () => {
               .toString(),
             passphrase: 'webpack-dev-server',
           },
+          port,
         },
         done
       );
diff --git a/test/server/inline-option.test.js b/test/server/inline-option.test.js
index b3d2e40e3c..18f72bdcef 100644
--- a/test/server/inline-option.test.js
+++ b/test/server/inline-option.test.js
@@ -4,6 +4,7 @@ const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/client-config/webpack.config');
 const multiCompilerConfig = require('../fixtures/multi-compiler-config/webpack.config');
+const port = require('../ports-map')['inline-option'];
 
 describe('inline option', () => {
   let server;
@@ -12,7 +13,7 @@ describe('inline option', () => {
   describe('simple inline config entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         host: '0.0.0.0',
         inline: true,
         watchOptions: {
@@ -26,16 +27,16 @@ describe('inline option', () => {
     afterAll(testServer.close);
 
     it('should include inline client script in the bundle', async () => {
-      await req
-        .get('/main.js')
-        .expect(200, /client\/index\.js\?http:\/\/0\.0\.0\.0:9000/);
+      const url = new RegExp(`client/index.js\\?http://0.0.0.0:${port}`);
+
+      await req.get('/main.js').expect(200, url);
     });
   });
 
   describe('multi compiler inline config entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         host: '0.0.0.0',
         inline: true,
         watchOptions: {
@@ -52,17 +53,17 @@ describe('inline option', () => {
 
     afterAll(testServer.close);
 
-    it('should include inline client script in the bundle', (done) => {
-      req
-        .get('/main.js')
-        .expect(200, /client\/index\.js\?http:\/\/0\.0\.0\.0:9000/, done);
+    it('should include inline client script in the bundle', async () => {
+      const url = new RegExp(`client/index.js\\?http://0.0.0.0:${port}`);
+
+      await req.get('/main.js').expect(200, url);
     });
   });
 
   describe('inline disabled entries', () => {
     beforeAll((done) => {
       const options = {
-        port: 9000,
+        port,
         host: '0.0.0.0',
         inline: false,
         watchOptions: {
@@ -78,7 +79,7 @@ describe('inline option', () => {
     it('should NOT include inline client script in the bundle', async () => {
       const { text } = await req.get('/main.js').expect(200);
 
-      expect(text).not.toMatch(/client\/index\.js\?http:\/\/0\.0\.0\.0:9000/);
+      expect(text.includes(`client/index.js?http://0.0.0.0:${port}`));
     });
   });
 });
diff --git a/test/server/lazy-option.test.js b/test/server/lazy-option.test.js
index 515126f8ed..1d2a660aaf 100644
--- a/test/server/lazy-option.test.js
+++ b/test/server/lazy-option.test.js
@@ -2,6 +2,7 @@
 
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['lazy-option'];
 
 describe('lazy option', () => {
   afterEach(testServer.close);
@@ -10,6 +11,7 @@ describe('lazy option', () => {
     expect(() => {
       testServer.start(config, {
         lazy: true,
+        port,
       });
     }).toThrow(/'filename' option must be set/);
   });
@@ -20,6 +22,7 @@ describe('lazy option', () => {
       {
         lazy: true,
         filename: 'bundle.js',
+        port,
       },
       done
     );
diff --git a/test/server/liveReload-option.test.js b/test/server/liveReload-option.test.js
index 6226f4d771..5cde4c0c7c 100644
--- a/test/server/liveReload-option.test.js
+++ b/test/server/liveReload-option.test.js
@@ -4,6 +4,7 @@ const path = require('path');
 const fs = require('fs');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/contentbase-config/webpack.config');
+const port = require('../ports-map')['liveReload-option'];
 
 const contentBasePublic = path.resolve(
   __dirname,
@@ -23,6 +24,7 @@ describe('liveReload option', () => {
           contentBase: contentBasePublic,
           watchContentBase: true,
           liveReload: false,
+          port,
         },
         done
       );
@@ -70,6 +72,7 @@ describe('liveReload option', () => {
           contentBase: contentBasePublic,
           watchContentBase: true,
           liveReload: true,
+          port,
         },
         done
       );
diff --git a/test/server/mimeTypes-option.test.js b/test/server/mimeTypes-option.test.js
index 4d5f56e45f..5f2fef5e7a 100644
--- a/test/server/mimeTypes-option.test.js
+++ b/test/server/mimeTypes-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['mineTypes-option'];
 
 describe('mimeTypes option', () => {
   describe('as an object', () => {
@@ -12,6 +13,7 @@ describe('mimeTypes option', () => {
       expect(() => {
         testServer.start(config, {
           mimeTypes: { 'application/octet-stream': ['js'] },
+          port,
         });
       }).toThrow(/Attempt to change mapping for/);
     });
@@ -24,6 +26,7 @@ describe('mimeTypes option', () => {
             typeMap: { 'application/octet-stream': ['js'] },
             force: true,
           },
+          port,
         },
         done
       );
@@ -42,6 +45,7 @@ describe('mimeTypes option', () => {
             typeMap: { 'application/octet-stream': ['js'] },
             force: true,
           },
+          port,
         },
         done
       );
diff --git a/test/server/onListening-option.test.js b/test/server/onListening-option.test.js
index 43db18eec8..d6d66b1565 100644
--- a/test/server/onListening-option.test.js
+++ b/test/server/onListening-option.test.js
@@ -2,6 +2,7 @@
 
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['onListening-option'];
 
 describe('onListening option', () => {
   let onListeningIsRunning = false;
@@ -17,6 +18,7 @@ describe('onListening option', () => {
 
           onListeningIsRunning = true;
         },
+        port,
       },
       done
     );
diff --git a/test/server/open-option.test.js b/test/server/open-option.test.js
index 1dae3cba70..b8f289859e 100644
--- a/test/server/open-option.test.js
+++ b/test/server/open-option.test.js
@@ -6,6 +6,7 @@ const webpack = require('webpack');
 const open = require('open');
 const Server = require('../../lib/Server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['open-option'];
 
 open.mockImplementation(() => {
   return {
@@ -18,15 +19,16 @@ describe('open option', () => {
     const compiler = webpack(config);
     const server = new Server(compiler, {
       open: true,
+      port,
     });
 
     compiler.hooks.done.tap('webpack-dev-server', () => {
-      expect(open.mock.calls[0]).toEqual(['http://localhost:8080/', {}]);
+      expect(open.mock.calls[0]).toEqual([`http://localhost:${port}/`, {}]);
       expect(open.mock.invocationCallOrder[0]).toEqual(1);
       server.close(done);
     });
 
     compiler.run(() => {});
-    server.listen(8080, 'localhost');
+    server.listen(port, 'localhost');
   });
 });
diff --git a/test/server/port-option.test.js b/test/server/port-option.test.js
index 534fab419f..d9fd6c2391 100644
--- a/test/server/port-option.test.js
+++ b/test/server/port-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['port-option'];
 
 describe('port', () => {
   let server = null;
@@ -10,7 +11,7 @@ describe('port', () => {
 
   describe('is not be specified', () => {
     beforeAll((done) => {
-      server = testServer.start(config, {}, done);
+      server = testServer.start(config, { port }, done);
       req = request(server.app);
     });
 
diff --git a/test/server/proxy-option.test.js b/test/server/proxy-option.test.js
index 8f465ccf56..21917d9ab8 100644
--- a/test/server/proxy-option.test.js
+++ b/test/server/proxy-option.test.js
@@ -7,21 +7,21 @@ const bodyParser = require('body-parser');
 const WebSocket = require('ws');
 const testServer = require('../helpers/test-server');
 const config = require('../fixtures/proxy-config/webpack.config');
+const [port1, port2, port3, port4] = require('../ports-map')['proxy-option'];
 
 const WebSocketServer = WebSocket.Server;
 const contentBase = path.resolve(__dirname, '../fixtures/proxy-config');
 
 const proxyOptionPathsAsProperties = {
   '/proxy1': {
-    target: 'http://localhost:9000',
+    target: `http://localhost:${port1}`,
   },
   '/api/proxy2': {
-    target: 'http://localhost:9001',
+    target: `http://localhost:${port2}`,
     pathRewrite: { '^/api': '' },
   },
   '/foo': {
     bypass(req) {
-      console.log(req.path);
       if (/\.html$/.test(req.path)) {
         return '/index.html';
       }
@@ -40,7 +40,7 @@ const proxyOptionPathsAsProperties = {
 
 const proxyOption = {
   context: () => true,
-  target: 'http://localhost:9000',
+  target: `http://localhost:${port1}`,
 };
 
 const proxyOptionOfArray = [
@@ -48,7 +48,7 @@ const proxyOptionOfArray = [
   function proxy() {
     return {
       context: '/api/proxy2',
-      target: 'http://localhost:9001',
+      target: `http://localhost:${port2}`,
       pathRewrite: { '^/api': '' },
     };
   },
@@ -69,8 +69,8 @@ function startProxyServers() {
     res.send('from proxy2');
   });
 
-  listeners.push(proxy1.listen(9000));
-  listeners.push(proxy2.listen(9001));
+  listeners.push(proxy1.listen(port1));
+  listeners.push(proxy2.listen(port2));
 
   // return a function to shutdown proxy servers
   return function proxy() {
@@ -93,6 +93,7 @@ describe('proxy option', () => {
         {
           contentBase,
           proxy: proxyOptionPathsAsProperties,
+          port: port3,
         },
         done
       );
@@ -149,6 +150,7 @@ describe('proxy option', () => {
         {
           contentBase,
           proxy: proxyOption,
+          port: port3,
         },
         done
       );
@@ -179,6 +181,7 @@ describe('proxy option', () => {
         {
           contentBase,
           proxy: proxyOptionOfArray,
+          port: port3,
         },
         done
       );
@@ -206,7 +209,7 @@ describe('proxy option', () => {
     let req;
     let listener;
     const proxyTarget = {
-      target: 'http://localhost:9000',
+      target: `http://localhost:${port1}`,
     };
 
     beforeAll((done) => {
@@ -216,7 +219,7 @@ describe('proxy option', () => {
         res.send('from proxy');
       });
 
-      listener = proxy.listen(9000);
+      listener = proxy.listen(port1);
 
       server = testServer.start(
         config,
@@ -226,6 +229,7 @@ describe('proxy option', () => {
             '/proxy1': proxyTarget,
             '/proxy2': proxyTarget,
           },
+          port: port3,
         },
         done
       );
@@ -261,15 +265,16 @@ describe('proxy option', () => {
           proxy: [
             {
               context: '/',
-              target: 'http://localhost:9003',
+              target: `http://localhost:${port4}`,
               ws: true,
             },
           ],
+          port: port3,
         },
         done
       );
 
-      wsServer = new WebSocketServer({ port: 9003 });
+      wsServer = new WebSocketServer({ port: port4 });
       wsServer.on('connection', (server) => {
         server.on('message', (message) => {
           server.send(message);
@@ -278,7 +283,7 @@ describe('proxy option', () => {
     });
 
     beforeEach((done) => {
-      ws = new WebSocket('ws://localhost:8080/proxy3/socket');
+      ws = new WebSocket(`ws://localhost:${port3}/proxy3/socket`);
       ws.on('message', (message) => {
         responseMessage = message;
         done();
@@ -303,7 +308,7 @@ describe('proxy option', () => {
     let req;
     let listener;
     const proxyTarget = {
-      target: 'http://localhost:9000',
+      target: `http://localhost:${port1}`,
     };
 
     beforeAll((done) => {
@@ -339,7 +344,7 @@ describe('proxy option', () => {
         res.send('DELETE method from proxy');
       });
 
-      listener = proxy.listen(9000);
+      listener = proxy.listen(port1);
 
       server = testServer.start(
         config,
diff --git a/test/server/serverMode-option.test.js b/test/server/serverMode-option.test.js
index dfec74e152..1b226e5a96 100644
--- a/test/server/serverMode-option.test.js
+++ b/test/server/serverMode-option.test.js
@@ -9,6 +9,7 @@ const SockJSServer = require('../../lib/servers/SockJSServer');
 const config = require('../fixtures/simple-config/webpack.config');
 const testServer = require('../helpers/test-server');
 const BaseServer = require('../../lib/servers/BaseServer');
+const port = require('../ports-map')['serverMode-option'];
 
 describe('serverMode option', () => {
   let server;
@@ -26,10 +27,11 @@ describe('serverMode option', () => {
         config,
         {
           serverMode: 'sockjs',
+          port,
         },
         done
       );
-      req = request('http://localhost:8080');
+      req = request(`http://localhost:${port}`);
     });
 
     it('sockjs path responds with a 200', async () => {
@@ -43,10 +45,11 @@ describe('serverMode option', () => {
         config,
         {
           serverMode: require.resolve('../../lib/servers/SockJSServer'),
+          port,
         },
         done
       );
-      req = request('http://localhost:8080');
+      req = request(`http://localhost:${port}`);
     });
 
     it('sockjs path responds with a 200', async () => {
@@ -60,10 +63,11 @@ describe('serverMode option', () => {
         config,
         {
           serverMode: SockJSServer,
+          port,
         },
         done
       );
-      req = request('http://localhost:8080');
+      req = request(`http://localhost:${port}`);
     });
 
     it('sockjs path responds with a 200', async () => {
@@ -76,6 +80,7 @@ describe('serverMode option', () => {
       server = testServer.start(
         config,
         {
+          port,
           sockPath: '/foo/test/bar/',
           serverMode: class MySockJSServer extends BaseServer {
             constructor(serv) {
diff --git a/test/server/servers/SockJSServer.test.js b/test/server/servers/SockJSServer.test.js
index 11a9d07923..a099f16e0c 100644
--- a/test/server/servers/SockJSServer.test.js
+++ b/test/server/servers/SockJSServer.test.js
@@ -5,6 +5,7 @@ const express = require('express');
 const SockJS = require('sockjs-client/dist/sockjs');
 const SockJSServer = require('../../../lib/servers/SockJSServer');
 const timer = require('../../helpers/timer');
+const port = require('../../ports-map').SockJSServer;
 
 describe('SockJSServer', () => {
   let socketServer;
@@ -15,7 +16,7 @@ describe('SockJSServer', () => {
     const app = new express();
 
     listeningApp = http.createServer(app);
-    listeningApp.listen(8080, 'localhost', () => {
+    listeningApp.listen(port, 'localhost', () => {
       const server = {
         log: {
           error: () => {},
@@ -44,7 +45,7 @@ describe('SockJSServer', () => {
         socketServer.close(connection);
       });
 
-      const client = new SockJS('http://localhost:8080/sockjs-node');
+      const client = new SockJS(`http://localhost:${port}/sockjs-node`);
 
       client.onmessage = (e) => {
         data.push(e.data);
diff --git a/test/server/sockPath-option.test.js b/test/server/sockPath-option.test.js
index b3a5566c8d..860e3818be 100644
--- a/test/server/sockPath-option.test.js
+++ b/test/server/sockPath-option.test.js
@@ -3,6 +3,7 @@
 const request = require('supertest');
 const config = require('../fixtures/simple-config/webpack.config');
 const testServer = require('../helpers/test-server');
+const port = require('../ports-map')['sockPath-option'];
 
 describe('sockPath options', () => {
   let server;
@@ -16,8 +17,8 @@ describe('sockPath options', () => {
 
   describe('default behavior', () => {
     beforeEach((done) => {
-      server = testServer.start(config, {}, done);
-      req = request('http://localhost:8080');
+      server = testServer.start(config, { port }, done);
+      req = request(`http://localhost:${port}`);
     });
 
     it('defaults to a path', () => {
@@ -37,10 +38,11 @@ describe('sockPath options', () => {
         config,
         {
           sockPath: '/foo/test/bar/',
+          port,
         },
         done
       );
-      req = request('http://localhost:8080');
+      req = request(`http://localhost:${port}`);
     });
 
     it('sets the sock path correctly and strips leading and trailing /s', () => {
diff --git a/test/server/stats-option.test.js b/test/server/stats-option.test.js
index ac996ca703..45e7cc3035 100644
--- a/test/server/stats-option.test.js
+++ b/test/server/stats-option.test.js
@@ -3,6 +3,7 @@
 const webpack = require('webpack');
 const Server = require('../../lib/Server');
 const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['stats-option'];
 
 describe('stats option', () => {
   it(`should works with difference stats values (contains 'hash', 'assets', 'warnings' and 'errors')`, async () => {
@@ -19,7 +20,7 @@ describe('stats option', () => {
 
     for (const stats of allStats) {
       const compiler = webpack(config);
-      const server = new Server(compiler, { stats });
+      const server = new Server(compiler, { stats, port });
 
       // eslint-disable-next-line no-await-in-loop
       await new Promise((resolve) => {
@@ -30,7 +31,7 @@ describe('stats option', () => {
         });
 
         compiler.run(() => {});
-        server.listen(8080, 'localhost');
+        server.listen(port, 'localhost');
       });
     }
   });
@@ -39,6 +40,7 @@ describe('stats option', () => {
     const compiler = webpack(config);
     const server = new Server(compiler, {
       stats: { warningsFilter: 'test' },
+      port,
     });
 
     compiler.hooks.done.tap('webpack-dev-server', (s) => {
@@ -53,6 +55,6 @@ describe('stats option', () => {
     });
 
     compiler.run(() => {});
-    server.listen(8080, 'localhost');
+    server.listen(port, 'localhost');
   });
 });
diff --git a/test/server/utils/createDomain.test.js b/test/server/utils/createDomain.test.js
index 08b839c585..07a755859c 100644
--- a/test/server/utils/createDomain.test.js
+++ b/test/server/utils/createDomain.test.js
@@ -4,6 +4,7 @@ const webpack = require('webpack');
 const internalIp = require('internal-ip');
 const Server = require('../../../lib/Server');
 const createDomain = require('../../../lib/utils/createDomain');
+const [port1, port2] = require('../../ports-map').createDomain;
 const config = require('./../../fixtures/simple-config/webpack.config');
 
 describe('check utility functions', () => {
@@ -15,9 +16,7 @@ describe('check utility functions', () => {
   });
 
   afterEach((done) => {
-    server.close(() => {
-      done();
-    });
+    server.close(done);
   });
 
   const tests = [
@@ -25,32 +24,32 @@ describe('check utility functions', () => {
       name: 'default',
       options: {
         host: 'localhost',
-        port: 8080,
+        port: port1,
       },
-      expected: 'http://localhost:8080',
+      expected: `http://localhost:${port1}`,
     },
     {
       name: 'no host option',
       options: {
-        port: 8080,
+        port: port1,
       },
-      expected: 'http://localhost:8080',
+      expected: `http://localhost:${port1}`,
     },
     {
       name: 'https',
       options: {
         host: 'localhost',
-        port: 8080,
+        port: port1,
         https: true,
       },
-      expected: 'https://localhost:8080',
+      expected: `https://localhost:${port1}`,
       timeout: 60000,
     },
     {
       name: 'override with public',
       options: {
         host: 'localhost',
-        port: 8080,
+        port: port1,
         public: 'myhost.test',
       },
       expected: 'http://myhost.test',
@@ -59,16 +58,16 @@ describe('check utility functions', () => {
       name: 'override with public (port)',
       options: {
         host: 'localhost',
-        port: 8080,
-        public: 'myhost.test:9090',
+        port: port1,
+        public: `myhost.test:${port2}`,
       },
-      expected: 'http://myhost.test:9090',
+      expected: `http://myhost.test:${port2}`,
     },
     {
       name: 'override with public (protocol)',
       options: {
         host: 'localhost',
-        port: 8080,
+        port: port1,
         public: 'https://myhost.test',
       },
       expected: 'https://myhost.test',
@@ -77,18 +76,18 @@ describe('check utility functions', () => {
       name: 'override with public (protocol + port)',
       options: {
         host: 'localhost',
-        port: 8080,
-        public: 'https://myhost.test:9090',
+        port: port1,
+        public: `https://myhost.test:${port2}`,
       },
-      expected: 'https://myhost.test:9090',
+      expected: `https://myhost.test:${port2}`,
     },
     {
       name: 'localIp',
       options: {
         useLocalIp: true,
-        port: 8080,
+        port: port1,
       },
-      expected: `http://${internalIp.v4.sync() || 'localhost'}:8080`,
+      expected: `http://${internalIp.v4.sync() || 'localhost'}:${port1}`,
     },
   ];
 
diff --git a/test/server/utils/routes.test.js b/test/server/utils/routes.test.js
index 78d1c8b0eb..27115a9d4b 100644
--- a/test/server/utils/routes.test.js
+++ b/test/server/utils/routes.test.js
@@ -3,13 +3,14 @@
 const request = require('supertest');
 const testServer = require('../../helpers/test-server');
 const config = require('../../fixtures/simple-config/webpack.config');
+const port = require('../../ports-map').routes;
 
 describe('routes util', () => {
   let server;
   let req;
 
   beforeAll((done) => {
-    server = testServer.startAwaitingCompilation(config, {}, done);
+    server = testServer.startAwaitingCompilation(config, { port }, done);
     req = request(server.app);
   });