1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
'use strict';
const { on, once, off, emit, count, amass } = require('api-utils/event/core');
const { Loader } = require('./helpers');
exports['test add a listener'] = function(assert) {
let events = [ { name: 'event#1' }, 'event#2' ];
let target = { name: 'target' };
on(target, 'message', function(message) {
assert.equal(this, target, 'this is a target object');
assert.equal(message, events.shift(), 'message is emitted event');
});
emit(target, 'message', events[0]);
emit(target, 'message', events[0]);
};
exports['test that listener is unique per type'] = function(assert) {
let actual = []
let target = {}
function listener() { actual.push(1) }
on(target, 'message', listener);
on(target, 'message', listener);
on(target, 'message', listener);
on(target, 'foo', listener);
on(target, 'foo', listener);
emit(target, 'message');
assert.deepEqual([ 1 ], actual, 'only one message listener added');
emit(target, 'foo');
assert.deepEqual([ 1, 1 ], actual, 'same listener added for other event');
};
exports['test event type matters'] = function(assert) {
let target = { name: 'target' }
on(target, 'message', function() {
assert.fail('no event is expected');
});
on(target, 'done', function() {
assert.pass('event is emitted');
});
emit(target, 'foo')
emit(target, 'done');
};
exports['test all arguments are pasesd'] = function(assert) {
let foo = { name: 'foo' }, bar = 'bar';
let target = { name: 'target' };
on(target, 'message', function(a, b) {
assert.equal(a, foo, 'first argument passed');
assert.equal(b, bar, 'second argument passed');
});
emit(target, 'message', foo, bar);
};
exports['test no side-effects in emit'] = function(assert) {
let target = { name: 'target' };
on(target, 'message', function() {
assert.pass('first listener is called');
on(target, 'message', function() {
assert.fail('second listener is called');
});
});
emit(target, 'message');
};
exports['test order of propagation'] = function(assert) {
let actual = [];
let target = { name: 'target' };
on(target, 'message', function() { actual.push(1); });
on(target, 'message', function() { actual.push(2); });
on(target, 'message', function() { actual.push(3); });
emit(target, 'message');
assert.deepEqual([ 1, 2, 3 ], actual, 'called in order they were added');
};
exports['test remove a listener'] = function(assert) {
let target = { name: 'target' };
let actual = [];
on(target, 'message', function listener() {
actual.push(1);
on(target, 'message', function() {
off(target, 'message', listener);
actual.push(2);
})
});
emit(target, 'message');
assert.deepEqual([ 1 ], actual, 'first listener called');
emit(target, 'message');
assert.deepEqual([ 1, 1, 2 ], actual, 'second listener called');
emit(target, 'message');
assert.deepEqual([ 1, 1, 2, 2, 2 ], actual, 'first listener removed');
};
exports['test remove all listeners for type'] = function(assert) {
let actual = [];
let target = { name: 'target' }
on(target, 'message', function() { actual.push(1); });
on(target, 'message', function() { actual.push(2); });
on(target, 'message', function() { actual.push(3); });
on(target, 'bar', function() { actual.push('b') });
off(target, 'message');
emit(target, 'message');
emit(target, 'bar');
assert.deepEqual([ 'b' ], actual, 'all message listeners were removed');
};
exports['test remove all listeners'] = function(assert) {
let actual = [];
let target = { name: 'target' }
on(target, 'message', function() { actual.push(1); });
on(target, 'message', function() { actual.push(2); });
on(target, 'message', function() { actual.push(3); });
on(target, 'bar', function() { actual.push('b') });
off(target);
emit(target, 'message');
emit(target, 'bar');
assert.deepEqual([], actual, 'all listeners events were removed');
};
exports['test falsy arguments are fine'] = function(assert) {
let type, listener, actual = [];
let target = { name: 'target' }
on(target, 'bar', function() { actual.push(0) });
off(target, 'bar', listener);
emit(target, 'bar');
assert.deepEqual([ 0 ], actual, '3rd bad ard will keep listeners');
off(target, type);
emit(target, 'bar');
assert.deepEqual([ 0, 0 ], actual, '2nd bad arg will keep listener');
off(target, type, listener);
emit(target, 'bar');
assert.deepEqual([ 0, 0, 0 ], actual, '2nd&3rd bad args will keep listener');
};
exports['test error handling'] = function(assert) {
let target = Object.create(null);
let error = Error('boom!');
on(target, 'message', function() { throw error; })
on(target, 'error', function(boom) {
assert.equal(boom, error, 'thrown exception causes error event');
});
emit(target, 'message');
};
exports['test unhandled errors'] = function(assert) {
let exceptions = [];
let loader = Loader(module);
let { emit, on } = loader.require('api-utils/event/core');
Object.defineProperties(loader.sandbox('api-utils/event/core'), {
console: { value: {
exception: function(e) {
exceptions.push(e)
}
}}
});
let target = {};
let boom = Error('Boom!');
let drax = Error('Draax!!');
on(target, 'message', function() { throw boom; });
emit(target, 'message');
assert.ok(~String(exceptions[0]).indexOf('Boom!'),
'unhandled exception is logged');
on(target, 'error', function() { throw drax; });
emit(target, 'message');
assert.ok(~String(exceptions[1]).indexOf('Draax!'),
'error in error handler is logged');
};
exports['test count'] = function(assert) {
let target = {};
assert.equal(count(target, 'foo'), 0, 'no listeners for "foo" events');
on(target, 'foo', function() {});
assert.equal(count(target, 'foo'), 1, 'listener registered');
on(target, 'foo', function() {}, 2, 'another listener registered');
off(target)
assert.equal(count(target, 'foo'), 0, 'listeners unregistered');
};
exports['test emit.lazy'] = function(assert) {
let target = {}, boom = Error('boom!'), errors = [], actual = []
on(target, 'error', function error(e) errors.push(e))
on(target, 'a', function() 1);
on(target, 'a', function() {});
on(target, 'a', function() 2);
on(target, 'a', function() { throw boom });
on(target, 'a', function() 3);
for each (let value in emit.lazy(target, 'a'))
actual.push(value);
assert.deepEqual(actual, [ 1, undefined, 2, 3 ],
'all results were collected');
assert.deepEqual(errors, [ boom ], 'errors reporetd');
};
require('test').run(exports);
|
