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eventemitter.tests.js
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eventemitter.tests.js
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/* global EventEmitter: true */
var noop = function() {};
Tinytest.add('emitter - test environment', function(test) {
test.isTrue(typeof EventEmitter !== 'undefined', 'test environment not initialized EventEmitter');
});
Tinytest.add('emitter - test more than 10 listeners warning', function() {
// This is actually just a test to see if we get a warning about +10 listeners
var emitter = new EventEmitter();
for (var i = 0; i < 11; i++) {
emitter.on('test', noop);
}
});
Tinytest.addAsync('emitter - test basic event', function(test, completed) {
var emitter = new EventEmitter();
emitter.on('test', function(foo, bar) {
test.equal(foo, 'foo', 'foo is not foo');
test.equal(bar, 'bar', 'bar is not bar');
completed();
});
emitter.emit('test', 'foo', 'bar');
});
Tinytest.addAsync('emitter - test event namespace', function(test, completed) {
var emitterA = new EventEmitter();
var emitterB = new EventEmitter();
emitterA.on('test', function() {
test.fail('We never emitted a "test" event to emitterA');
completed();
});
emitterB.emit('test', 'We have no listeners on B yet');
emitterB.on('test', function() {
test.ok('We never emitted a "test" event to emitterA');
completed();
});
emitterB.emit('test', 'Hello B');
});
Tinytest.addAsync('emitter - test on and once', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 3;
emitterA.on('test', function() {
counter++;
});
emitterA.once('test', function() {
counter++;
});
emitterA.emit('test', 'Hello'); // 2
emitterA.emit('test', 'World'); // 1
// wait for result
Meteor.setTimeout(function() {
if (counter < expectedCount) {
test.fail('We are missing some callbacks ' + counter + ' expected ' + expectedCount);
}
if (counter > expectedCount) {
test.fail('We are getting too many callbacks ' + counter + ' expected ' + expectedCount);
}
completed();
}, 10);
});
Tinytest.addAsync('emitter - test remove listener', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 3;
emitterA.on('test2', function() {
counter++;
});
emitterA.on('test', function() {
counter++;
});
emitterA.once('test', function() {
counter++;
});
emitterA.emit('test', 'Hello'); // 2
emitterA.removeAllListeners('test');
// This should still emit...
emitterA.emit('test2', 'Hello'); // 1
// wait for result
Meteor.setTimeout(function() {
if (counter < expectedCount) {
test.fail('We are missing some callbacks ' + counter + ' expected ' + expectedCount);
}
if (counter > expectedCount) {
test.fail('We are getting too many callbacks ' + counter + ' expected ' + expectedCount);
}
completed();
}, 10);
});
Tinytest.addAsync('emitter - test remove all listeners', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 2;
emitterA.on('test2', function() {
counter++;
});
emitterA.on('test', function() {
counter++;
});
emitterA.once('test', function() {
counter++;
});
emitterA.emit('test', 'Hello'); // 2
emitterA.removeAllListeners();
// This should not emit...
emitterA.emit('test2', 'Hello'); // 0
// wait for result
Meteor.setTimeout(function() {
if (counter < expectedCount) {
test.fail('We are missing some callbacks ' + counter + ' expected ' + expectedCount);
}
if (counter > expectedCount) {
test.fail('We are getting too many callbacks ' + counter + ' expected ' + expectedCount);
}
completed();
}, 10);
});
Tinytest.addAsync('emitter - test one listener', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 7;
var knownListener = function() {
counter++;
}
emitterA.on('test', knownListener);
emitterA.once('test', knownListener);
emitterA.on('test', function() {
counter++;
});
emitterA.once('test', function() {
counter++;
});
emitterA.emit('test', 'Hello'); // 4
emitterA.emit('test', 'Hello'); // 2
emitterA.removeListener('test', knownListener);
emitterA.emit('test', 'Hello'); // 1
// wait for result
Meteor.setTimeout(function() {
if (counter < expectedCount) {
test.fail('We are missing some callbacks ' + counter + ' expected ' + expectedCount);
}
if (counter > expectedCount) {
test.fail('We are getting too many callbacks ' + counter + ' expected ' + expectedCount);
}
completed();
}, 10);
});
Tinytest.addAsync('emitter - test only add known listener once', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 19;
var knownListener = function() {
counter++;
};
emitterA.on('test', knownListener); // 1
emitterA.on('test', knownListener); // 2
emitterA.on('test', knownListener); // 3
emitterA.on('test', knownListener); // 4
emitterA.on('test', knownListener); // 5
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
emitterA.emit('test', 'Hello'); // 2 (10)
emitterA.emit('test', 'Hello'); // 1 (5)
emitterA.removeListener('test', knownListener);
emitterA.emit('test', 'Hello'); // 0 (4)
// wait for result
Meteor.setTimeout(function() {
if (counter < expectedCount) {
test.fail('We are missing some callbacks ' + counter + ' expected ' + expectedCount);
}
if (counter > expectedCount) {
test.fail('We are getting too many callbacks ' + counter + ' expected ' + expectedCount);
}
completed();
}, 10);
});
Tinytest.addAsync('emitter - test when got a failing listener', function(test, completed) {
var emitterA = new EventEmitter();
var counter = 0;
var expectedCount = 2;
var knownListener = function() {
counter++;
};
var failListener = function() {
throw new Error('Failing listener');
// counter++;
};
emitterA.on('test', knownListener); // 1
emitterA.on('test', knownListener); // 2
emitterA.on('test', failListener); // 3
emitterA.on('test', knownListener); // 4
emitterA.on('test', knownListener); // 5
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
emitterA.once('test', failListener);
emitterA.once('test', knownListener);
emitterA.once('test', knownListener);
try {
emitterA.emit('test', 'Hello');
test.fail("tests needs to be failed!");
} catch(ex) {
test.equal(counter, expectedCount);
completed();
}
});
Tinytest.addAsync('emitter - test listener scope #7', function(test, completed) {
var em = new EventEmitter();
em.addListener('testScope', function() {
test.instanceOf(this, EventEmitter);
test.isTrue(this === em, 'Listener scope should be the eventemitter instance');
completed();
});
em.emit('testScope');
});
//Test API:
//test.isFalse(v, msg)
//test.isTrue(v, msg)
//test.equal(actual, expected, message, not)
//test.length(obj, len)
//test.include(s, v)
//test.isNaN(v, msg)
//test.isUndefined(v, msg)
//test.isNotNull
//test.isNull
//test.throws(func)
//test.instanceOf(obj, klass)
//test.notEqual(actual, expected, message)
//test.runId()
//test.exception(exception)
//test.expect_fail()
//test.ok(doc)
//test.fail(doc)