e06d11dcb2
Add service for throttling function calls; specifically supports reducing tick mark recalculation, WTD-1202.
49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/
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define(
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["../../src/services/Throttle"],
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function (Throttle) {
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"use strict";
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describe("The 'throttle' service", function () {
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var throttle,
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mockTimeout,
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mockFn,
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mockPromise;
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beforeEach(function () {
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mockTimeout = jasmine.createSpy("$timeout");
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mockPromise = jasmine.createSpyObj("promise", ["then"]);
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mockFn = jasmine.createSpy("fn");
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mockTimeout.andReturn(mockPromise);
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throttle = new Throttle(mockTimeout);
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});
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it("provides functions which run on a timeout", function () {
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var throttled = throttle(mockFn);
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// Verify precondition: Not called at throttle-time
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expect(mockTimeout).not.toHaveBeenCalled();
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expect(throttled()).toEqual(mockPromise);
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expect(mockTimeout).toHaveBeenCalledWith(mockFn, 0, false);
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});
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it("schedules only one timeout at a time", function () {
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var throttled = throttle(mockFn);
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throttled();
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throttled();
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throttled();
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expect(mockTimeout.calls.length).toEqual(1);
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});
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it("schedules additional invocations after resolution", function () {
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var throttled = throttle(mockFn);
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throttled();
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mockPromise.then.mostRecentCall.args[0](); // Resolve timeout
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throttled();
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mockPromise.then.mostRecentCall.args[0]();
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throttled();
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expect(mockTimeout.calls.length).toEqual(3);
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});
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});
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}
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); |