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Events.test.js
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Events.test.js
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/*jshint node:true*/
describe('Events', function () {
'use strict';
var assert = require('assert');
var events = global.events;
var obj, obj2;
function setup() {
obj = {
counter: 0
};
obj2 = {
counterA: 0,
counterB: 0
};
events.mixin(obj);
events.mixin(obj2);
}
describe('on and trigger', function () {
beforeEach(setup);
it('counter should be incremented.', function () {
obj.on('event', function () {
obj.counter += 1;
});
obj.trigger('event');
assert.strictEqual(obj.counter, 1);
obj.trigger('event');
obj.trigger('event');
obj.trigger('event');
obj.trigger('event');
assert.strictEqual(obj.counter, 5);
});
});
describe('binding and triggering', function () {
beforeEach(setup);
it('multiple events', function () {
obj.on('a b c', function () {
obj.counter += 1;
});
obj.trigger('a');
assert.strictEqual(obj.counter, 1);
obj.trigger('a').trigger('b');
assert.strictEqual(obj.counter, 3);
obj.trigger('c');
assert.strictEqual(obj.counter, 4);
obj.off('a c');
obj.trigger('a').trigger('b').trigger('c');
assert.strictEqual(obj.counter, 5);
});
it('with event maps', function () {
var increment = function () {
this.counter += 1;
};
obj.on({
a: increment,
b: increment,
c: increment
}, obj);
obj.trigger('a');
assert.strictEqual(obj.counter, 1);
obj.trigger('a').trigger('b');
assert.strictEqual(obj.counter, 3);
obj.trigger('c');
assert.strictEqual(obj.counter, 4);
obj.off({
a: increment,
c: increment
}, obj);
obj.trigger('a').trigger('b').trigger('c');
assert.strictEqual(obj.counter, 5);
});
});
describe('on', function () {
beforeEach(setup);
it('then unbind all functions', function () {
var callback = function () {
obj.counter += 1;
};
obj.on('event', callback);
obj.trigger('event');
obj.off('event');
obj.trigger('event');
assert.strictEqual(obj.counter, 1); // counter should have only been incremented once
});
it('two callbacks, unbind only one', function () {
var callback = function () {
obj2.counterA += 1;
};
obj2.on('event', callback);
obj2.on('event', function () {
obj2.counterB += 1;
});
obj2.trigger('event');
obj2.off('event', callback);
obj2.trigger('event');
assert.strictEqual(obj2.counterA, 1); // counterA should have only been incremented once
assert.strictEqual(obj2.counterB, 2); // counterB should have been incremented twice
});
it('then unbind a callback in the midst of it firing', function () {
var callback = function () {
obj.counter += 1;
obj.off('event', callback);
};
obj.on('event', callback);
obj.trigger('event');
obj.trigger('event');
obj.trigger('event');
assert.strictEqual(obj.counter, 1); // the callback should have been unbound
});
});
describe('callbacks', function () {
beforeEach(setup);
it('that unbind themeselves', function () {
var incrA = function () {
obj2.counterA += 1;
obj2.off('event', incrA);
};
var incrB = function () {
obj2.counterB += 1;
obj2.off('event', incrB);
};
obj2.on('event', incrA);
obj2.on('event', incrB);
obj2.trigger('event');
obj2.trigger('event');
obj2.trigger('event');
assert.strictEqual(obj2.counterA, 1); // counterA should have only been incremented once
assert.strictEqual(obj2.counterB, 1); // counterB should have only been incremented once
});
it('bound with a supplied context', function () {
var TestClass = function () {
return this;
};
TestClass.prototype.assertTrue = function () {
assert.ok(true); //'`this` was bound to the callback
};
obj.on('event', function () {
this.assertTrue();
}, new TestClass());
obj.trigger('event');
});
it('nested trigger with unbind', function () {
var incr1 = function () {
obj.counter += 1;
obj.off('event', incr1);
obj.trigger('event');
};
var incr2 = function () {
obj.counter += 1;
};
obj.on('event', incr1);
obj.on('event', incr2);
obj.trigger('event');
assert.strictEqual(obj.counter, 3); // counter should have been incremented three times
});
it('are not altered during trigger', function () {
var counter = 0;
var incr = function () {
counter++;
};
obj.on('event', function () {
obj.on('event', incr).on('all', incr);
})
.trigger('event');
assert.strictEqual(counter, 0); // bind does not alter callback list
obj.off()
.on('event', function () {
obj.off('event', incr).off('all', incr);
})
.on('event', incr)
.on('all', incr)
.trigger('event');
assert.strictEqual(counter, 2); // unbind does not alter callback list
});
});
describe('remove', function () {
beforeEach(setup);
it('all events for a specific context', function () {
obj.on('x y all', function () {
assert.ok(true);
});
obj.on('x y all', function () {
assert.ok(false);
}, obj);
obj.off(null, null, obj);
obj.trigger('x y');
});
it('all events for a specific callback', function () {
var success = function () {
assert.ok(true);
};
var fail = function () {
assert.ok(false);
};
obj.on('x y all', success);
obj.on('x y all', fail);
obj.off(null, fail);
obj.trigger('x y');
});
it('does not skip consecutive events', function () {
obj.on('event', function () {
assert.ok(false);
}, obj);
obj.on('event', function () {
assert.ok(false);
}, obj);
obj.off(null, null, obj);
obj.trigger('event');
});
});
describe('once', function () {
beforeEach(setup);
it('counters', function () {
// Same as the previous test, but we use once rather than having to explicitly unbind
var incrA = function () {
obj2.counterA += 1;
obj2.trigger('event');
};
var incrB = function () {
obj2.counterB += 1;
};
obj2.once('event', incrA);
obj2.once('event', incrB);
obj2.trigger('event');
assert.strictEqual(obj2.counterA, 1); // counterA should have only been incremented once
assert.strictEqual(obj2.counterB, 1); // counterB should have only been incremented once
});
it('variant two', function () {
var f = function () {
assert.ok(true);
};
var a = {};
var b = {};
events.mixin(a);
events.mixin(b);
a.once('event', f);
b.on('event', f);
a.trigger('event');
b.trigger('event');
b.trigger('event');
});
it('variant three', function () {
var f = function () {
assert.ok(true);
};
obj.once('event', f)
.on('event', f)
.trigger('event')
.trigger('event');
});
it('with off', function () {
var f = function () {
assert.ok(true);
};
obj.once('event', f);
obj.off('event', f);
obj.trigger('event');
});
it('with event maps', function () {
var increment = function () {
this.counter += 1;
};
obj.once({
a: increment,
b: increment,
c: increment
}, obj);
obj.trigger('a');
assert.strictEqual(obj.counter, 1);
obj.trigger('a').trigger('b');
assert.strictEqual(obj.counter, 2);
obj.trigger('c');
assert.strictEqual(obj.counter, 3);
obj.trigger('a').trigger('b').trigger('c');
assert.strictEqual(obj.counter, 3);
});
it('with off only by context', function () {
var context = {};
obj.once('event', function () {
assert.ok(false);
}, context);
obj.off(null, null, context);
obj.trigger('event');
});
it('with asynchronous events', function (done) {
var doneId = null;
var func = function () {
assert.strictEqual(doneId, null);
doneId = setTimeout(done, 50);
};
obj.once('async', func);
setTimeout(function () {
setTimeout(function () {
obj.trigger('async');
}, 0);
obj.trigger('async');
}, 0);
});
it('with multiple events.', function () {
obj.once('x y', function () {
assert.ok(true);
});
obj.trigger('x').trigger('y');
});
it('Off during iteration', function () {
var f = function () {
this.off('event', f);
};
obj.on('event', f, obj);
obj.once('event', function () {});
obj.on('event', function () {
assert.ok(true);
});
obj.trigger('event');
obj.trigger('event');
});
});
describe('`all`', function () {
beforeEach(setup);
it('once should work as expected', function () {
obj.once('all', function () {
assert.ok(true);
obj.trigger('all');
});
obj.trigger('all');
});
it('callback list is retrieved after each event.', function () {
var counter = 0;
var incr = function () {
counter++;
};
obj.on('x', function () {
obj.on('y', incr).on('all', incr);
})
.trigger('x').trigger('y');
assert.strictEqual(counter, 2);
});
it('triggered for each event', function () {
var a, b;
obj.on('all', function (event) {
obj.counter++;
if (event == 'a') a = true;
if (event == 'b') b = true;
})
.trigger('a').trigger('b');
assert.ok(a);
assert.ok(b);
assert.strictEqual(obj.counter, 2);
});
});
describe('noop', function () {
beforeEach(setup);
it('on without a callback', function () {
obj.on('test').trigger('test');
});
it('once without a callback', function () {
obj.once('event').trigger('event');
});
});
it('event functions are chainable', function () {
setup();
function fn() {}
assert.strictEqual(obj, obj.trigger('noeventssetyet'));
assert.strictEqual(obj, obj.off('noeventssetyet'));
assert.strictEqual(obj, obj.on('a', fn));
assert.strictEqual(obj, obj.once('c', fn));
assert.strictEqual(obj2, obj2.trigger('a'));
assert.strictEqual(obj2, obj2.off('a c'));
});
it('usage example', function () {
var args, count = 0;
// require('../').mixin({})
events.mixin({})
.on('myevent', function () {
count++;
args = arguments;
}, console)
.trigger('myevent', 'something', 'something', 'darkside');
assert.strictEqual(count, 1);
assert.strictEqual(args[0], 'something');
assert.strictEqual(args[1], 'something');
assert.strictEqual(args[2], 'darkside');
assert.strictEqual(args[3], undefined);
});
});