test: use-interval

Author: NelsonYong

packages/hooks/src/useInterval/__tests__/index.spec.ts

@@ -0,0 +1,38 @@
+import useInterval from '..'
+
+// import {} from '@vue/test-utils'
+
+describe('useInterval', () => {
+  vitest.useFakeTimers()
+  vitest.spyOn(global, 'clearInterval')
+
+  it('interval should work', () => {
+    const callback = vitest.fn()
+    useInterval(callback, 20)
+    expect(callback).not.toBeCalled()
+    vitest.advanceTimersByTime(70)
+    expect(callback).toHaveBeenCalledTimes(3)
+  })
+
+  it('interval should stop', () => {
+    const callback = vitest.fn()
+
+    useInterval(callback, undefined)
+    vitest.advanceTimersByTime(50)
+    expect(callback).toHaveBeenCalledTimes(0)
+
+    useInterval(callback, -2)
+    vitest.advanceTimersByTime(50)
+    expect(callback).toHaveBeenCalledTimes(0)
+  })
+
+  it('immediate in options should work', () => {
+    const callback = vitest.fn()
+    useInterval(callback, 20, { immediate: true })
+
+    expect(callback).toBeCalled()
+    expect(callback).toHaveBeenCalledTimes(1)
+    vitest.advanceTimersByTime(50)
+    expect(callback).toHaveBeenCalledTimes(3)
+  })
+})