73 lines
1.5 KiB
JavaScript
73 lines
1.5 KiB
JavaScript
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var assert = require('assert');
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var throttle = require('./');
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describe('throttle', function(){
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function counter() {
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function count(){
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count.invoked++;
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}
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count.invoked = 0;
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return count;
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}
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it('should throttle a function', function(done){
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var count = counter();
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var wait = 100;
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var total = 500;
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var fn = throttle(count, wait);
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var interval = setInterval(fn, 20);
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setTimeout(function(){
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clearInterval(interval);
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assert(count.invoked === (total / wait));
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done();
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}, total + 5);
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});
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it('should call the function last time', function(done){
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var count = counter();
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var wait = 100;
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var fn = throttle(count, wait);
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fn();
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fn();
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assert(count.invoked === 1);
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setTimeout(function(){
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assert(count.invoked === 2);
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done();
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}, wait + 5);
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});
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it('should pass last context', function(done){
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var wait = 100;
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var ctx;
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var fn = throttle(logctx, wait);
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var foo = {};
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var bar = {};
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fn.call(foo);
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fn.call(bar);
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assert(ctx === foo);
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setTimeout(function(){
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assert(ctx === bar);
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done();
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}, wait + 5);
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function logctx() {
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ctx = this;
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}
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});
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it('should pass last arguments', function(done){
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var wait = 100;
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var args;
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var fn = throttle(logargs, wait);
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fn.call(null, 1);
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fn.call(null, 2);
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assert(args && args[0] === 1);
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setTimeout(function(){
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assert(args && args[0] === 2);
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done();
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}, wait + 5);
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function logargs() {
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args = arguments;
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}
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});
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});
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