From 94cd98409ee21a7a2ab05820d57125ff2f1e8f2f Mon Sep 17 00:00:00 2001
From: Diego Aquino <diegocruzdeaquino@gmail.com>
Date: Sun, 8 Mar 2026 10:46:16 -0300
Subject: [PATCH] test(in-flight): add flaky in-flight request tests

This adds two temporary test cases to help us investigate requests still being handled by workers
after they are stopped. Related to https://github.com/mswjs/msw/issues/2597.
---
 .../stop/in-flight-request.test.ts            | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/test/browser/msw-api/setup-worker/stop/in-flight-request.test.ts b/test/browser/msw-api/setup-worker/stop/in-flight-request.test.ts
index 22eb4dd5c..fa8f46ce2 100644
--- a/test/browser/msw-api/setup-worker/stop/in-flight-request.test.ts
+++ b/test/browser/msw-api/setup-worker/stop/in-flight-request.test.ts
@@ -58,3 +58,45 @@ test('bypasses requests made after the worker was stopped', async ({
 
   expect(data).toBe('original response')
 })
+
+// Note: Let's temporarily repeat this test to make it more likely to identify flakyness.
+// This is not a definitive test case.
+for (let testNumber = 1; testNumber <= 50; testNumber++) {
+  test(`bypasses requests not immediately made after the worker was stopped, considering no default response (${testNumber})`, async ({
+    loadExample,
+    page,
+  }) => {
+    await loadExample(new URL('./in-flight-request.mocks.ts', import.meta.url))
+
+    // Stop worker and make request in different `page.evaluate` calls.
+    await page.evaluate(async () => {
+      window.msw.worker.stop()
+    })
+
+    const data = await page.evaluate(async () => {
+      return fetch('/resource').then((response) => response.text())
+    })
+
+    expect(data).toContain('Cannot GET /resource')
+  })
+}
+
+// Note: Let's temporarily repeat this test to make it more likely to identify flakyness.
+// This is not a definitive test case.
+for (let testNumber = 1; testNumber <= 50; testNumber++) {
+  test(`bypasses requests immediately made after the worker was stopped, considering no default response (${testNumber})`, async ({
+    loadExample,
+    page,
+  }) => {
+    await loadExample(new URL('./in-flight-request.mocks.ts', import.meta.url))
+
+    // Stop worker and make request in the same `page.evaluate` call.
+    const data = await page.evaluate(async () => {
+      window.msw.worker.stop()
+
+      return fetch('/resource').then((response) => response.text())
+    })
+
+    expect(data).toContain('Cannot GET /resource')
+  })
+}