65 lines
1.7 KiB
TypeScript
65 lines
1.7 KiB
TypeScript
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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import { debounce } from "./debounce";
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describe("debounce", () => {
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beforeEach(() => {
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vi.useFakeTimers();
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});
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afterEach(() => {
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vi.restoreAllMocks();
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});
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it("delays executing the callback until after wait time has elapsed", () => {
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const mockCallback = vi.fn();
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const debouncedFunction = debounce(mockCallback, 500);
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debouncedFunction();
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expect(mockCallback).not.toHaveBeenCalled();
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vi.advanceTimersByTime(300);
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expect(mockCallback).not.toHaveBeenCalled();
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vi.advanceTimersByTime(200);
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expect(mockCallback).toHaveBeenCalledTimes(1);
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});
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it("only executes the callback once if called multiple times within wait period", () => {
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const mockCallback = vi.fn();
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const debouncedFunction = debounce(mockCallback, 500);
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debouncedFunction();
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debouncedFunction();
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debouncedFunction();
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vi.advanceTimersByTime(500);
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expect(mockCallback).toHaveBeenCalledTimes(1);
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});
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it("resets the timer when called again during wait period", () => {
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const mockCallback = vi.fn();
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const debouncedFunction = debounce(mockCallback, 500);
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debouncedFunction();
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vi.advanceTimersByTime(300);
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debouncedFunction();
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vi.advanceTimersByTime(300);
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expect(mockCallback).not.toHaveBeenCalled();
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vi.advanceTimersByTime(200);
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expect(mockCallback).toHaveBeenCalledTimes(1);
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});
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it("passes arguments to the callback function", () => {
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const mockCallback = vi.fn();
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const debouncedFunction = debounce(mockCallback, 500);
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debouncedFunction("test", 123);
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vi.advanceTimersByTime(500);
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expect(mockCallback).toHaveBeenCalledWith("test", 123);
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});
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});
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