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198 lines (165 loc) · 5.52 KB
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var assert = require('assert'),
Events = require('./dist/minivents.commonjs.js');
describe('Events "new" Constructor', function () {
it('should return an object containing the methods used by minivents if called with new', function () {
var bus = new Events();
assert.equal('object', typeof bus);
});
it('should contain an `emit` function', function () {
var bus = new Events();
assert.equal('function', typeof bus.emit);
});
it('should contain an `off` function', function () {
var bus = new Events();
assert.equal('function', typeof bus.off);
});
it('should contain an `on` function', function () {
var bus = new Events();
assert.equal('function', typeof bus.on);
});
});
describe('Events "mixin" Constructor', function () {
it('should return undefined if called with an empty object', function () {
var bus = {},
ret = Events(bus);
assert.equal(undefined, ret);
});
it('should contain an `emit` function', function () {
var bus = {};
Events(bus);
assert.equal('function', typeof bus.emit);
});
it('should contain an `off` function', function () {
var bus = {};
Events(bus);
assert.equal('function', typeof bus.off);
});
it('should contain an `on` function', function () {
var bus = {};
Events(bus);
assert.equal('function', typeof bus.on);
});
});
describe('`on` function', function () {
it('should not throw any exceptions when called with a string and a function', function () {
var bus = new Events();
try {
bus.on('ping', function () { });
} catch (e) {
assert.fail(undefined, e, e.toString());
}
});
it('should not throw any exceptions when called with a string, a function and an object', function () {
var bus = new Events();
try {
bus.on('ping', function () { }, { });
} catch (e) {
assert.fail(undefined, e, e.toString());
}
});
});
describe('`off` function', function () {
it('should not throw any exceptions when called with a string and a function', function () {
var bus = new Events(),
f = function () { };
bus.on('ping', f);
try {
bus.off('ping', f);
} catch (e) {
assert.fail(undefined, e, e.toString());
}
});
it('should not throw any exceptions when called with a function that is not registered as a callback for the specified event', function () {
var bus = new Events();
bus.on('ping', function () { });
try {
bus.off('ping', function () { });
} catch (e) {
assert.fail(undefined, e, e.toString());
}
});
it('should not throw any exceptions when called with the name of an event that does not exist', function () {
var bus = new Events(),
f = function () { };
bus.on('ping', f);
try {
bus.off('pong', f);
} catch (e) {
assert.fail(undefined, e, e.toString());
}
});
it('should result in the given callback no longer being triggered', function () {
var bus = new Events(),
f = function () { assert.fail(undefined, undefined, 'This function must not be executed.'); };
bus.on('ping', f);
bus.off('ping', f);
bus.emit('ping');
});
});
describe('`emit` function', function () {
it('should result in registered callbacks being invoked', function () {
var bus = new Events(),
called = 0,
f1 = function () { called++ },
f2 = function () { called++ },
f3 = function () { called++ };
bus.on('ping', f1);
bus.on('ping', f2);
bus.on('ping', f3);
bus.emit('ping');
assert.equal(called, 3);
});
it('should pass all of its additional arguments to the callback', function () {
var bus = new Events(),
f = function (arg0, arg1) {
assert.equal('foo', arg0);
assert.equal('bar', arg1);
};
bus.on('ping', f);
bus.emit('ping', 'foo', 'bar');
});
it('should inject a callback\'s context', function () {
var bus = new Events(),
ctx = { }
f = function () { assert.equal(ctx, this); };
bus.on('ping', f, ctx);
bus.emit('ping');
});
it('should result in registered callbacks being invoked with cascade', function () {
var bus = new Events(),
called = 0,
cascade = false,
f1 = function () { called++ },
f2 = function () { called++ },
f3 = function () { called++ },
f4 = function () { bus.emit('cascade'); },
f5 = function () { called++ },
f6 = function () { cascade = true; };
bus.on('ping', f1);
bus.on('ping', f2);
bus.on('ping', f3);
bus.on('ping', f4);
bus.on('ping', f5);
bus.on('cascade', f6);
bus.emit('ping');
assert.equal(called, 4);
assert.equal(cascade, true);
});
it('should result in registered callbacks being invoked event if one callback remove himself', function () {
var bus = new Events(),
called = 0,
cascade = false,
f1 = function () { called++ },
f2 = function () { called++ },
f3 = function () { called++ },
f4 = function () { bus.off('ping', f4); },
f5 = function () { called++ };
bus.on('ping', f1);
bus.on('ping', f2);
bus.on('ping', f3);
bus.on('ping', f4);
bus.on('ping', f5);
bus.emit('ping');
assert.equal(called, 4);
});
});