wishthis/node_modules/just-debounce/test.js
2022-01-21 09:28:41 +01:00

130 lines
3.2 KiB
JavaScript

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