purchase-let/node_modules/tiny-emitter/test/index.js

218 lines
4.7 KiB
JavaScript

var Emitter = require('../index');
var emitter = require('../instance');
var test = require('tape');
test('subscribes to an event', function (t) {
var emitter = new Emitter();
emitter.on('test', function () {});
t.equal(emitter.e.test.length, 1, 'subscribed to event');
t.end();
});
test('subscribes to an event with context', function (t) {
var emitter = new Emitter();
var context = {
contextValue: true
};
emitter.on('test', function () {
t.ok(this.contextValue, 'is in context');
t.end();
}, context);
emitter.emit('test');
});
test('subscibes only once to an event', function (t) {
var emitter = new Emitter();
emitter.once('test', function () {
t.notOk(emitter.e.test, 'removed event from list');
t.end();
});
emitter.emit('test');
});
test('keeps context when subscribed only once', function (t) {
var emitter = new Emitter();
var context = {
contextValue: true
};
emitter.once('test', function () {
t.ok(this.contextValue, 'is in context');
t.notOk(emitter.e.test, 'not subscribed anymore');
t.end();
}, context);
emitter.emit('test');
});
test('emits an event', function (t) {
var emitter = new Emitter();
emitter.on('test', function () {
t.ok(true, 'triggered event');
t.end();
});
emitter.emit('test');
});
test('passes all arguments to event listener', function (t) {
var emitter = new Emitter();
emitter.on('test', function (arg1, arg2) {
t.equal(arg1, 'arg1', 'passed the first argument');
t.equal(arg2, 'arg2', 'passed the second argument');
t.end();
});
emitter.emit('test', 'arg1', 'arg2');
});
test('unsubscribes from all events with name', function (t) {
var emitter = new Emitter();
emitter.on('test', function () {
t.fail('should not get called');
});
emitter.off('test');
emitter.emit('test')
process.nextTick(function () {
t.end();
});
});
test('unsubscribes single event with name and callback', function (t) {
var emitter = new Emitter();
var fn = function () {
t.fail('should not get called');
}
emitter.on('test', fn);
emitter.off('test', fn);
emitter.emit('test')
process.nextTick(function () {
t.end();
});
});
// Test added by https://github.com/lazd
// From PR: https://github.com/scottcorgan/tiny-emitter/pull/6
test('unsubscribes single event with name and callback when subscribed twice', function (t) {
var emitter = new Emitter();
var fn = function () {
t.fail('should not get called');
};
emitter.on('test', fn);
emitter.on('test', fn);
emitter.off('test', fn);
emitter.emit('test');
process.nextTick(function () {
t.notOk(emitter.e['test'], 'removes all events');
t.end();
});
});
test('unsubscribes single event with name and callback when subscribed twice out of order', function (t) {
var emitter = new Emitter();
var calls = 0;
var fn = function () {
t.fail('should not get called');
};
var fn2 = function () {
calls++;
};
emitter.on('test', fn);
emitter.on('test', fn2);
emitter.on('test', fn);
emitter.off('test', fn);
emitter.emit('test');
process.nextTick(function () {
t.equal(calls, 1, 'callback was called');
t.end();
});
});
test('removes an event inside another event', function (t) {
var emitter = new Emitter();
emitter.on('test', function () {
t.equal(emitter.e.test.length, 1, 'event is still in list');
emitter.off('test');
t.notOk(emitter.e.test, 0, 'event is gone from list');
t.end();
});
emitter.emit('test');
});
test('event is emitted even if unsubscribed in the event callback', function (t) {
var emitter = new Emitter();
var calls = 0;
var fn = function () {
calls += 1;
emitter.off('test', fn);
};
emitter.on('test', fn);
emitter.on('test', function () {
calls += 1;
});
emitter.on('test', function () {
calls += 1;
});
process.nextTick(function () {
t.equal(calls, 3, 'all callbacks were called');
t.end();
});
emitter.emit('test');
});
test('calling off before any events added does nothing', function (t) {
var emitter = new Emitter();
emitter.off('test', function () {});
t.end();
});
test('emitting event that has not been subscribed to yet', function (t) {
var emitter = new Emitter();
emitter.emit('some-event', 'some message');
t.end();
});
test('unsubscribes single event with name and callback which was subscribed once', function (t) {
var emitter = new Emitter();
var fn = function () {
t.fail('event not unsubscribed');
}
emitter.once('test', fn);
emitter.off('test', fn);
emitter.emit('test');
t.end();
});
test('exports an instance', function (t) {
t.ok(emitter, 'exports an instance')
t.ok(emitter instanceof Emitter, 'an instance of the Emitter class');
t.end();
});