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228 lines (183 loc) · 4.02 KB
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var test = require('../util/test')(__filename);
var debounce = require('../../packages/function-debounce');
test('waits for n ms then runs once', function(t) {
t.plan(1);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 100);
for (var i = 0; i < 5; i++) {
setTimeout(fn, 50);
}
setTimeout(function() {
t.equal(callCounter, 1);
t.end();
}, 300);
});
test('cancel debounced function', function(t) {
t.plan(1);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 200);
fn();
fn();
fn.cancel();
setTimeout(function() {
t.equal(callCounter, 0);
}, 300);
});
test('when callFirst is true, runs once, waits for n ms then runs again', function(
t
) {
t.plan(2);
var callCounter = 0;
var fn = debounce(
function() {
callCounter++;
},
100,
true
);
fn();
for (var i = 0; i < 5; i++) {
setTimeout(fn, 50);
}
t.equal(callCounter, 1);
setTimeout(function() {
t.equal(callCounter, 2);
t.end();
}, 300);
});
test('invokes repeatedly when call intervals > than wait time', function(t) {
t.plan(4);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 100);
var runAndTest = function(expectedCounter) {
fn();
t.equal(callCounter, expectedCounter);
};
fn();
setTimeout(function() {
runAndTest(1);
setTimeout(function() {
runAndTest(2);
setTimeout(function() {
runAndTest(3);
setTimeout(function() {
runAndTest(4);
}, 200);
}, 200);
}, 200);
}, 200);
});
test('invokes repeatedly when wait is 0', function(t) {
t.plan(3);
var callCounter = 0;
var fn1 = debounce(function() {
callCounter++;
}, 0);
fn1();
t.equal(callCounter, 1);
fn1();
t.equal(callCounter, 2);
fn1();
t.equal(callCounter, 3);
});
test('invokes repeatedly when wait is falsey', function(t) {
t.plan(1);
var callCounter = 0;
var fn1 = debounce(function() {
callCounter++;
});
fn1();
fn1();
fn1();
setTimeout(function() {
t.equal(callCounter, 3);
t.end();
}, 200);
});
test('cancel debounced function when callFirst is true', function(t) {
t.plan(1);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 200, true);
fn();
fn();
fn.cancel();
setTimeout(function() {
t.equal(callCounter, 1);
t.end();
}, 300);
});
test('immediately invoke debounced function', function(t) {
t.plan(3);
var params = {};
var callCounter = 0;
var fn = debounce(function(param1, param2) {
params.param1 = param1;
params.param2 = param2,
callCounter++;
}, 200);
fn('js', 'ts');
fn.flush();
t.equal(callCounter, 1);
t.deepEqual(params, {param1: 'js', param2: 'ts'});
setTimeout(function() {
t.equal(callCounter, 1);
t.end();
}, 300);
});
test('immediately invoke debounced function when callFirst = true', function(t) {
t.plan(3);
var params = {};
var callCounter = 0;
var fn = debounce(function(param1, param2) {
params.param1 = param1;
params.param2 = param2,
callCounter++;
}, 200, true);
fn('js', 'ts');
fn.flush();
t.equal(callCounter, 2);
t.deepEqual(params, {param1: 'js', param2: 'ts'});
setTimeout(function() {
t.equal(callCounter, 2);
t.end();
}, 300);
});
test('should not run the debounced function if cancel was invoked before the flush', function(t) {
t.plan(2);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 200);
fn();
fn.cancel();
fn.flush();
t.equal(callCounter, 0);
setTimeout(function() {
t.equal(callCounter, 0);
t.end();
}, 300);
});
test('debounced function runs once if cancel was invoked before flush and callFirst = true',
function(t) {
t.plan(2);
var callCounter = 0;
var fn = debounce(function() {
callCounter++;
}, 200, true);
fn();
fn.cancel();
fn.flush();
t.equal(callCounter, 1);
setTimeout(function() {
t.equal(callCounter, 1);
t.end();
}, 300);
});