83 lines
2.1 KiB
JavaScript
83 lines
2.1 KiB
JavaScript
var clock, original, debounced;
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var firedOnce = function(message) {
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ok(original.calledOnce, message);
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};
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var firedTwice = function(message) {
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ok(original.calledTwice, message);
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};
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var notFired = function(message) {
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ok(!original.called, message);
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};
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module("Discourse.debounce", {
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setup: function() {
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clock = sinon.useFakeTimers();
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original = sinon.spy();
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debounced = Discourse.debounce(original, 100);
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},
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teardown: function() {
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clock.restore();
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}
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});
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test("delays function execution till the end of the timeout", function() {
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debounced();
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notFired("immediately after calling debounced function nothing happens");
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clock.tick(99);
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notFired("just before the end of the timeout still nothing happens");
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clock.tick(1);
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firedOnce("exactly at the end of the timeout the function is executed");
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});
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test("executes delayed function only once, no matter how many times debounced function is called during the timeout", function() {
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debounced();
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debounced();
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clock.tick(100);
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firedOnce("second call was supressed");
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});
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test("prolongs the timeout when the debounced function is called for the second time during the timeout", function() {
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debounced();
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clock.tick(50);
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debounced();
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clock.tick(50);
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notFired("at the end of the original timeout nothing happens");
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clock.tick(50);
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firedOnce("function is executed exactly at the end of the prolonged timeout");
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});
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test("preserves last call's context and params when executing delayed function", function() {
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var firstObj = {};
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var secondObj = {};
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debounced.call(firstObj, "first");
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debounced.call(secondObj, "second");
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clock.tick(100);
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ok(original.calledOn(secondObj), "the context of the last of two subsequent calls is preserved");
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ok(original.calledWithExactly("second"), "param passed during the last of two subsequent calls is preserved");
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});
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test("can be called again after timeout passes", function() {
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var firstObj = {};
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var secondObj = {};
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debounced.call(firstObj, "first");
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clock.tick(100);
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debounced.call(secondObj, "second");
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clock.tick(100);
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firedTwice();
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});
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