diff --git a/test/cli/cli.test.js b/test/cli/cli.test.js
index d593799245..51114d3dd4 100644
--- a/test/cli/cli.test.js
+++ b/test/cli/cli.test.js
@@ -20,29 +20,25 @@ describe('CLI', () => {
     testBin('--progress')
       .then((output) => {
         expect(output.code).toEqual(0);
-        expect(output.stderr.includes('0% compiling')).toBe(true);
+        expect(output.stderr).toContain('0% compiling');
         // should not profile
-        expect(
-          output.stderr.includes('ms after chunk modules optimization')
-        ).toBe(false);
+        expect(output.stderr).not.toContain(
+          'ms after chunk modules optimization'
+        );
         done();
       })
       .catch(done);
   });
 
   it('--quiet', async (done) => {
-    const output = await testBin(`--quiet --port ${port1}`);
+    const output = await testBin(`--quiet --colors=false --port ${port1}`);
     expect(output.code).toEqual(0);
     expect(output.stdout.split('\n').length === 3).toBe(true);
-    expect(
-      output.stdout.includes(`Project is running at http://localhost:${port1}/`)
-    ).toBe(true);
-    expect(output.stdout.includes('webpack output is served from /')).toBe(
-      true
+    expect(output.stdout).toContain(
+      `Project is running at http://localhost:${port1}/`
     );
-    expect(
-      output.stdout.includes('Content not from webpack is served from')
-    ).toBe(true);
+    expect(output.stdout).toContain('webpack output is served from /');
+    expect(output.stdout).toContain('Content not from webpack is served from');
     done();
   });
 
@@ -51,9 +47,7 @@ describe('CLI', () => {
       .then((output) => {
         expect(output.code).toEqual(0);
         // should profile
-        expect(output.stderr.includes('after chunk modules optimization')).toBe(
-          true
-        );
+        expect(output.stderr).toContain('after chunk modules optimization');
         done();
       })
       .catch(done);
@@ -63,7 +57,7 @@ describe('CLI', () => {
     testBin('--bonjour')
       .then((output) => {
         expect(output.code).toEqual(0);
-        expect(output.stdout.includes('Bonjour')).toBe(true);
+        expect(output.stdout).toContain('Bonjour');
         done();
       })
       .catch(done);
@@ -73,7 +67,7 @@ describe('CLI', () => {
     testBin('--https')
       .then((output) => {
         expect(output.code).toEqual(0);
-        expect(output.stdout.includes('Project is running at')).toBe(true);
+        expect(output.stdout).toContain('Project is running at');
         done();
       })
       .catch(done);
@@ -85,7 +79,7 @@ describe('CLI', () => {
     )
       .then((output) => {
         expect(output.code).toEqual(0);
-        expect(output.stdout.includes('Project is running at')).toBe(true);
+        expect(output.stdout).toContain('Project is running at');
         done();
       })
       .catch(done);
@@ -115,9 +109,9 @@ describe('CLI', () => {
     testBin('--color')
       .then((output) => {
         // https://github.com/webpack/webpack-dev-server/blob/master/lib/utils/colors.js
-        expect(
-          output.stdout.includes('\u001b[39m \u001b[90m｢wds｣\u001b[39m:')
-        ).toEqual(true);
+        expect(output.stdout).toContain(
+          '\u001b[39m \u001b[90m｢wds｣\u001b[39m:'
+        );
         done();
       })
       .catch(done);
@@ -134,7 +128,7 @@ describe('CLI', () => {
         if (process.platform === 'win32') {
           done();
         } else {
-          expect(output.stdout.includes(socketPath)).toBe(true);
+          expect(output.stdout).toContain(socketPath);
 
           unlink(socketPath, () => {
             done();
@@ -155,7 +149,7 @@ describe('CLI', () => {
       })
       .catch((err) => {
         // for windows
-        expect(err.stdout.includes('Compiled successfully.')).toEqual(true);
+        expect(err.stdout).toContain('Compiled successfully.');
         done();
       });
   });
diff --git a/test/e2e/ClientOptions.test.js b/test/e2e/ClientOptions.test.js
index c1cd2fffe9..ca3ea17057 100644
--- a/test/e2e/ClientOptions.test.js
+++ b/test/e2e/ClientOptions.test.js
@@ -72,11 +72,9 @@ describe('Client code', () => {
           .then((requestObj) => {
             page.waitFor(beforeBrowserCloseDelay).then(() => {
               browser.close().then(() => {
-                expect(
-                  requestObj
-                    .url()
-                    .includes(`http://localhost:${port1}/sockjs-node`)
-                ).toBeTruthy();
+                expect(requestObj.url()).toContain(
+                  `http://localhost:${port1}/sockjs-node`
+                );
                 done();
               });
             });
@@ -115,11 +113,9 @@ describe('Client complex inline script path', () => {
           .then((requestObj) => {
             page.waitFor(beforeBrowserCloseDelay).then(() => {
               browser.close().then(() => {
-                expect(
-                  requestObj
-                    .url()
-                    .includes(`http://myhost.test:${port2}/foo/test/bar/`)
-                ).toBeTruthy();
+                expect(requestObj.url()).toContain(
+                  `http://myhost.test:${port2}/foo/test/bar/`
+                );
                 done();
               });
             });
@@ -158,11 +154,9 @@ describe('Client complex inline script path with sockPort', () => {
           .then((requestObj) => {
             page.waitFor(beforeBrowserCloseDelay).then(() => {
               browser.close().then(() => {
-                expect(
-                  requestObj
-                    .url()
-                    .includes(`http://localhost:${port3}/foo/test/bar`)
-                ).toBeTruthy();
+                expect(requestObj.url()).toContain(
+                  `http://localhost:${port3}/foo/test/bar`
+                );
                 done();
               });
             });
@@ -202,11 +196,9 @@ describe('Client complex inline script path with sockPort, no sockPath', () => {
           .then((requestObj) => {
             page.waitFor(beforeBrowserCloseDelay).then(() => {
               browser.close().then(() => {
-                expect(
-                  requestObj
-                    .url()
-                    .includes(`http://localhost:${port3}/sockjs-node`)
-                ).toBeTruthy();
+                expect(requestObj.url()).toContain(
+                  `http://localhost:${port3}/sockjs-node`
+                );
                 done();
               });
             });
@@ -242,11 +234,9 @@ describe('Client complex inline script path with sockHost', () => {
           .then((requestObj) => {
             page.waitFor(beforeBrowserCloseDelay).then(() => {
               browser.close().then(() => {
-                expect(
-                  requestObj
-                    .url()
-                    .includes(`http://myhost.test:${port2}/sockjs-node`)
-                ).toBeTruthy();
+                expect(requestObj.url()).toContain(
+                  `http://myhost.test:${port2}/sockjs-node`
+                );
                 done();
               });
             });