test: correct false-negative for advancing timers (#948)

ph-fritsche · web-flow · commit bf0014561d50 · 2022-05-10T10:38:26.000+02:00
diff --git a/tests/utils/misc/wait.ts b/tests/utils/misc/wait.ts
@@ -1,9 +1,18 @@
+import {createConfig} from '#src/setup/setup'
 import {wait} from '#src/utils/misc/wait'
 
 test('advances timers when set', async () => {
+  const beforeReal = performance.now()
   jest.useFakeTimers()
-  jest.setTimeout(50)
-  // If this wasn't advancing fake timers, we'd timeout and fail the test
-  await wait(10000, jest.advanceTimersByTime)
+  const beforeFake = performance.now()
+
+  const config = createConfig({
+    delay: 1000,
+    advanceTimers: jest.advanceTimersByTime,
+  })
+  await wait(config)
+
+  expect(performance.now() - beforeFake).toBe(1000)
   jest.useRealTimers()
-})
+  expect(performance.now() - beforeReal).toBeLessThan(10)
+}, 10)
