39 lines
806 B
JavaScript
39 lines
806 B
JavaScript
import debounce from "../debounce"
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describe("debounce", () => {
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test("doesn't call function right after calling", () => {
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const fn = jest.fn()
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const debFunc = debounce(fn, 100)
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debFunc()
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expect(fn).not.toHaveBeenCalled()
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})
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test("calls the function after the given timeout", () => {
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const fn = jest.fn()
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jest.useFakeTimers()
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const debFunc = debounce(fn, 100)
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debFunc()
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jest.runAllTimers()
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expect(fn).toHaveBeenCalled()
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expect(setTimeout).toHaveBeenCalledWith(expect.any(Function), 100)
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})
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test("calls the function only one time within the timeframe", () => {
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const fn = jest.fn()
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const debFunc = debounce(fn, 1000)
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for (let i = 0; i < 100; i++) debFunc()
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jest.runAllTimers()
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expect(fn).toHaveBeenCalledTimes(1)
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})
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})
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