fix(happy-dom): don't crash when calling useFakeTimers with empty config (#4214)

sheremet-va · web-flow · commit 2e1a1bd42b46 · 2023-10-02T15:54:04.000+02:00
diff --git a/packages/vitest/src/integrations/vi.ts b/packages/vitest/src/integrations/vi.ts
@@ -217,7 +217,7 @@ function createVitest(): VitestUtils {
       }
 
       if (config)
-        _timers.configure(config)
+        _timers.configure({ ...workerState.config.fakeTimers, ...config })
       else
         _timers.configure(workerState.config.fakeTimers)
 
diff --git a/test/core/test/environments/happy-dom.spec.ts b/test/core/test/environments/happy-dom.spec.ts
@@ -0,0 +1,11 @@
+// @vitest-environment happy-dom
+
+import { afterEach, test, vi } from 'vitest'
+
+afterEach(() => {
+  vi.useRealTimers()
+})
+
+test('fake timers don\'t fail when using empty config', () => {
+  vi.useFakeTimers({})
+})

Original file line number	Diff line number	Diff line change
`@@ -217,7 +217,7 @@ function createVitest(): VitestUtils {`
`217`	`217`	`}`
`218`	`218`
`219`	`219`	`if (config)`
`220`		`- _timers.configure(config)`
	`220`	`+ _timers.configure({ ...workerState.config.fakeTimers, ...config })`
`221`	`221`	`else`
`222`	`222`	`_timers.configure(workerState.config.fakeTimers)`
`223`	`223`