122 lines
3.0 KiB
JavaScript
122 lines
3.0 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(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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}, 6, false, true)
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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(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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}, 6, true)
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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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