130 lines
3.2 KiB
JavaScript
130 lines
3.2 KiB
JavaScript
var debounce = require('./index.js');
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var test = require('tape');
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test('debauce', function (t) {
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t.plan(3);
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var fn = debounce(function (a, b) {
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t.deepEqual(this, { call: 3 }, 'context should be preserved');
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t.equal(a, 30, 'should preserve args');
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t.equal(b, 300, 'should preserve args');
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}, 10);
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fn.call({ call: 1 }, 10, 100);
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fn.call({ call: 2 }, 20, 200);
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setTimeout(function () {
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fn.call({ call: 3 }, 30, 300);
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}, 3);
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});
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test('multiple calls should extend delay', function (t) {
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t.plan(4);
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var wasDelayed = false;
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var fn = debounce(function (a, b) {
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t.deepEqual(this, { call: 3 }, 'context should be preserved');
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t.equal(a, 30, 'should preserve args');
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t.equal(b, 300, 'should preserve args');
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t.ok(wasDelayed, 'should have waited longer than debounce period');
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}, 6);
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setTimeout(function longer() {
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wasDelayed = true;
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}, 9);
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fn.call({ call: 1 }, 10, 100);
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setTimeout(function () {
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fn.call({ call: 2 }, 20, 200);
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setTimeout(function () {
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fn.call({ call: 3 }, 30, 300);
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}, 5);
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}, 3);
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});
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test('multiple calls should not extend delay when guarantee is true', function (t) {
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t.plan(8);
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var first = true;
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var wasDelayed = false;
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var fn = debounce(
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function (a, b) {
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if (first) {
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t.deepEqual(this, { call: 2 }, '1st context should be preserved');
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t.equal(a, 20, '1st should preserve 1st args');
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t.equal(b, 200, '1st should preserve 2nd args');
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t.notOk(wasDelayed, 'should not have waited longer than debounce period');
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first = false;
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} else {
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t.deepEqual(this, { call: 3 }, 'context should be preserved');
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t.equal(a, 30, 'should preserve args');
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t.equal(b, 300, 'should preserve args');
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t.ok(wasDelayed, 'should have waited longer than debounce period');
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}
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},
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6,
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false,
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true
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);
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setTimeout(function longer() {
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wasDelayed = true;
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}, 7);
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fn.call({ call: 1 }, 10, 100);
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setTimeout(function () {
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fn.call({ call: 2 }, 20, 200);
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setTimeout(function () {
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fn.call({ call: 3 }, 30, 300);
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}, 5);
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}, 3);
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});
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test('at start', function (t) {
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t.plan(9);
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var callCount = 0;
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var fn = debounce(
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function (a, b) {
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if (callCount === 0) {
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t.deepEqual(this, { call: 1 }, '1st context should be preserved');
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t.equal(a, 10, '1st should preserve 1st args');
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t.equal(b, 100, '1st should preserve 2nd args');
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} else if (callCount === 1) {
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t.deepEqual(this, { call: 3 }, 'context should be preserved');
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t.equal(a, 30, 'should preserve args');
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t.equal(b, 300, 'should preserve args');
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} else {
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t.deepEqual(this, { call: 4 }, 'context should be preserved');
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t.equal(a, 40, 'should preserve 1st args');
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t.equal(b, 400, 'should preserve 2nd args');
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}
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callCount += 1;
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},
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6,
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true
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);
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fn.call({ call: 1 }, 10, 100);
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fn.call({ call: 2 }, 20, 200);
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setTimeout(function () {
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fn.call({ call: 3 }, 30, 300);
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setTimeout(function () {
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fn.call({ call: 4 }, 40, 400);
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}, 10);
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setTimeout(function () {
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fn.call({ call: 5 }, 50, 500);
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}, 3);
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}, 10);
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});
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