92 lines
3.6 KiB
JavaScript
92 lines
3.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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var Async_1 = require("./Async");
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describe('Async', function () {
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describe('debounce', function () {
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// Increase count by a specific number, to test the arguments
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// of the debounced function;
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var callCount = 0;
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var fnMock = function (increaseCount) {
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callCount += increaseCount;
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return callCount;
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};
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var fn;
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var async;
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var debouncedFn;
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beforeEach(function () {
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jest.useFakeTimers();
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fn = jest.fn(fnMock);
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async = new Async_1.Async();
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debouncedFn = async.debounce(fn, 100);
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});
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afterEach(function () {
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callCount = 0;
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fn.mockClear();
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});
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it('should debounce multiple calls', function () {
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// Mock Date.now to return each call
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// First one is the first debouncedFn(1)
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// Second one is debouncedFn(2)
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// A last one will be when the timer fires after we run pending timers in jest.
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var dateMock = jest
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.spyOn(Date, 'now')
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.mockImplementationOnce(function () { return 10; })
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.mockImplementationOnce(function () { return 11; })
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.mockImplementation(function () { return 2000; });
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debouncedFn(1);
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expect(debouncedFn.pending()).toBeTruthy();
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debouncedFn(2);
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expect(debouncedFn.pending()).toBeTruthy();
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jest.runOnlyPendingTimers();
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expect(fn).toHaveBeenCalledTimes(1);
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expect(callCount).toEqual(2);
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dateMock.mockRestore();
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});
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it('should flush the last value', function () {
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debouncedFn(10);
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debouncedFn(20);
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expect(debouncedFn.pending()).toBeTruthy();
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expect(debouncedFn.flush()).toEqual(20);
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});
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it('should be marked pending as expected', function () {
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debouncedFn(100);
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expect(debouncedFn.pending()).toBeTruthy();
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debouncedFn(200);
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expect(debouncedFn.pending()).toBeTruthy();
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debouncedFn.flush();
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expect(debouncedFn.pending()).toBeFalsy();
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});
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it('should be cancellable', function () {
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debouncedFn(1000);
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debouncedFn.cancel();
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expect(debouncedFn.pending()).toBeFalsy();
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expect(debouncedFn.flush()).toBeUndefined();
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});
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});
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describe('throttle', function () {
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it('should throttle multiple calls', function () {
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jest.useFakeTimers();
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// Mock Date.now to return each call
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// First one is the first throttledFn(1)
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// Second one is throttledFn(2)
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// A last one will be when the timer fires after we run pending timers in jest.
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var dateMock = jest
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.spyOn(Date, 'now')
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.mockImplementationOnce(function () { return 10; })
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.mockImplementationOnce(function () { return 11; })
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.mockImplementation(function () { return 2000; });
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var fn = jest.fn(function (num) { return num; });
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var async = new Async_1.Async();
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var throttledFn = async.throttle(fn, 1000);
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var result = throttledFn(1);
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expect(result).toBeUndefined();
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result = throttledFn(2);
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expect(result).toBeUndefined();
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jest.runOnlyPendingTimers();
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expect(fn).toHaveBeenCalledTimes(1);
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dateMock.mockRestore();
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jest.useRealTimers();
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});
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});
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});
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//# sourceMappingURL=Async.test.js.map
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