diff --git a/index.js b/index.js
index 61a3b0bd1d..814b04276e 100644
--- a/index.js
+++ b/index.js
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-const { setDevMode } = require('./lib/utils/utils');
-setDevMode(); // Note: we must call setDevMode before initializing.
+const { setUnderTest } = require('./lib/utils/utils');
+setUnderTest(); // Note: we must call setUnderTest before initializing.
 
 const { Playwright } = require('./lib/server/playwright');
 const { Electron } = require('./lib/server/electron/electron');
diff --git a/src/client/browserContext.ts b/src/client/browserContext.ts
index c3a2791393..bddc1b8205 100644
--- a/src/client/browserContext.ts
+++ b/src/client/browserContext.ts
@@ -26,7 +26,7 @@ import { Events } from './events';
 import { TimeoutSettings } from '../utils/timeoutSettings';
 import { Waiter } from './waiter';
 import { URLMatch, Headers, WaitForEventOptions } from './types';
-import { isDevMode, headersObjectToArray } from '../utils/utils';
+import { isUnderTest, headersObjectToArray } from '../utils/utils';
 
 export class BrowserContext extends ChannelOwner<channels.BrowserContextChannel, channels.BrowserContextInitializer> {
   _pages = new Set<Page>();
@@ -158,7 +158,7 @@ export class BrowserContext extends ChannelOwner<channels.BrowserContextChannel,
   }
 
   async setHTTPCredentials(httpCredentials: { username: string, password: string } | null): Promise<void> {
-    if (!isDevMode())
+    if (!isUnderTest())
       deprecate(`context.setHTTPCredentials`, `warning: method |context.setHTTPCredentials()| is deprecated. Instead of changing credentials, create another browser context with new credentials.`);
     return this._wrapApiCall('browserContext.setHTTPCredentials', async () => {
       await this._channel.setHTTPCredentials({ httpCredentials: httpCredentials || undefined });
diff --git a/src/client/channelOwner.ts b/src/client/channelOwner.ts
index b607564bc5..be7d84a53f 100644
--- a/src/client/channelOwner.ts
+++ b/src/client/channelOwner.ts
@@ -19,7 +19,7 @@ import * as channels from '../protocol/channels';
 import type { Connection } from './connection';
 import type { Logger } from './types';
 import { debugLogger } from '../utils/debugLogger';
-import { isDevMode } from '../utils/utils';
+import { isUnderTest } from '../utils/utils';
 
 export abstract class ChannelOwner<T extends channels.Channel = channels.Channel, Initializer = {}> extends EventEmitter {
   private _connection: Connection;
@@ -100,7 +100,7 @@ export abstract class ChannelOwner<T extends channels.Channel = channels.Channel
       return result;
     } catch (e) {
       logApiCall(logger, `<= ${apiName} failed`);
-      const innerStack = (isDevMode() && e.stack) ? e.stack.substring(e.stack.indexOf(e.message) + e.message.length) : '';
+      const innerStack = (isUnderTest() && e.stack) ? e.stack.substring(e.stack.indexOf(e.message) + e.message.length) : '';
       e.message = `${apiName}: ` + e.message;
       e.stack = e.message + innerStack + stack;
       throw e;
diff --git a/src/inprocess.ts b/src/inprocess.ts
index 18d71d8a12..5c913850f4 100644
--- a/src/inprocess.ts
+++ b/src/inprocess.ts
@@ -20,7 +20,6 @@ import type { Playwright as PlaywrightAPI } from './client/playwright';
 import { PlaywrightDispatcher } from './dispatchers/playwrightDispatcher';
 import { Connection } from './client/connection';
 import { BrowserServerLauncherImpl } from './browserServerImpl';
-import { isDevMode } from './utils/utils';
 import { instrumentingAgents } from './server/instrumentation';
 import { DebugController } from './debug/debugController';
 
@@ -45,7 +44,6 @@ export function setupInProcess(playwright: PlaywrightImpl): PlaywrightAPI {
   dispatcherConnection.onmessage = message => setImmediate(() => clientConnection.dispatch(message));
   clientConnection.onmessage = message => setImmediate(() => dispatcherConnection.dispatch(message));
 
-  if (isDevMode())
-    (playwrightAPI as any)._toImpl = (x: any) => dispatcherConnection._dispatchers.get(x._guid)!._object;
+  (playwrightAPI as any)._toImpl = (x: any) => dispatcherConnection._dispatchers.get(x._guid)!._object;
   return playwrightAPI;
 }
diff --git a/src/protocol/validatorPrimitives.ts b/src/protocol/validatorPrimitives.ts
index a5de550b96..ac996b078d 100644
--- a/src/protocol/validatorPrimitives.ts
+++ b/src/protocol/validatorPrimitives.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { isDevMode } from '../utils/utils';
+import { isUnderTest } from '../utils/utils';
 
 export class ValidationError extends Error {}
 export type Validator = (arg: any, path: string) => any;
@@ -81,7 +81,7 @@ export const tObject = (s: { [key: string]: Validator }): Validator => {
       if (!Object.is(value, undefined))
         result[key] = value;
     }
-    if (isDevMode()) {
+    if (isUnderTest()) {
       for (const [key, value] of Object.entries(arg)) {
         if (key.startsWith('__testHook'))
           result[key] = value;
diff --git a/src/server/processLauncher.ts b/src/server/processLauncher.ts
index 1de89f376f..b19281a7a0 100644
--- a/src/server/processLauncher.ts
+++ b/src/server/processLauncher.ts
@@ -22,7 +22,7 @@ import * as stream from 'stream';
 import { helper } from './helper';
 import { Progress } from './progress';
 import * as types from './types';
-import { isDevMode } from '../utils/utils';
+import { isUnderTest } from '../utils/utils';
 
 export type Env = {[key: string]: string | number | boolean | undefined};
 
@@ -120,7 +120,7 @@ export async function launchProcess(options: LaunchProcessOptions): Promise<Laun
     listeners.push(helper.addEventListener(process, 'SIGINT', () => {
       gracefullyClose().then(() => {
         // Give tests a chance to dispatch any async calls.
-        if (isDevMode())
+        if (isUnderTest())
           setTimeout(() => process.exit(130), 0);
         else
           process.exit(130);
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index 56d11c69e0..bbdf8b6b67 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -62,7 +62,7 @@ export function assert(value: any, message?: string): asserts value {
 }
 
 export function debugAssert(value: any, message?: string): asserts value {
-  if (isDevMode() && !value)
+  if (isUnderTest() && !value)
     throw new Error(message);
 }
 
@@ -87,12 +87,12 @@ export function isDebugMode(): boolean {
   return isInDebugMode;
 }
 
-let _isDevMode = false;
-export function setDevMode() {
-  _isDevMode = true;
+let _isUnderTest = false;
+export function setUnderTest() {
+  _isUnderTest = true;
 }
-export function isDevMode(): boolean {
-  return _isDevMode;
+export function isUnderTest(): boolean {
+  return _isUnderTest;
 }
 
 export function getFromENV(name: string) {
diff --git a/test/playwright.fixtures.ts b/test/playwright.fixtures.ts
index 15b9f5690c..285bd51a3f 100644
--- a/test/playwright.fixtures.ts
+++ b/test/playwright.fixtures.ts
@@ -115,7 +115,7 @@ registerWorkerFixture('defaultBrowserOptions', async ({browserName}, test) => {
 registerWorkerFixture('playwright', async ({browserName}, test) => {
   const {coverage, uninstall} = installCoverageHooks(browserName);
   if (options.WIRE) {
-    require('../lib/utils/utils').setDevMode();
+    require('../lib/utils/utils').setUnderTest();
     const connection = new Connection();
     const spawnedProcess = childProcess.fork(path.join(__dirname, '..', 'lib', 'server.js'), [], {
       stdio: 'pipe',