From 9e3ac1f3a283080e71912b52eb25e4b4a4e9a221 Mon Sep 17 00:00:00 2001
From: Max Schmitt <max@schmitt.mx>
Date: Thu, 22 Jul 2021 18:27:01 +0200
Subject: [PATCH] fix(test-runner): warn users who invoke the test-runner with
 Jest (#7743)

---
 src/test/testType.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/test/testType.ts b/src/test/testType.ts
index 2aad99ea0e..d715f2a142 100644
--- a/src/test/testType.ts
+++ b/src/test/testType.ts
@@ -55,6 +55,7 @@ export class TestTypeImpl {
   }
 
   private _createTest(type: 'default' | 'only', location: Location, title: string, fn: Function) {
+    throwIfRunningInsideJest();
     const suite = currentlyLoadingFileSuite();
     if (!suite)
       throw new Error(`test() can only be called in a test file`);
@@ -71,6 +72,7 @@ export class TestTypeImpl {
   }
 
   private _describe(type: 'default' | 'only', location: Location, title: string, fn: Function) {
+    throwIfRunningInsideJest();
     const suite = currentlyLoadingFileSuite();
     if (!suite)
       throw new Error(`describe() can only be called in a test file`);
@@ -151,4 +153,14 @@ export class TestTypeImpl {
   }
 }
 
+function throwIfRunningInsideJest() {
+  if (process.env.JEST_WORKER_ID) {
+    throw new Error(
+        `Playwright Test needs to be invoked via 'npx playwright test' and excluded from Jest test runs.\n` +
+        `Creating one directory for Playwright tests and one for Jest is the recommended way of doing it.\n` +
+        `See https://playwright.dev/docs/intro/ for more information about Playwright Test.`,
+    );
+  }
+}
+
 export const rootTestType = new TestTypeImpl([]);