telegraph/test.js at master · dubrowgn/telegraph · GitHub

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
var assert = require('assert');

console.log('do not pollute node globals');
    var telegraph = 17;
    require('./index');
    assert.strictEqual(telegraph, 17);

    // emitter for tests
    var telegraph = require('./index');
    var emitter = {};
    assert.strictEqual(emitter, telegraph(emitter));

console.log('emiting one event listener');
    var event1count = 0;
    var event1handler = function() { event1count++; };
    assert.strictEqual(emitter, emitter.on('event1', event1handler));

    assert.strictEqual(true, emitter.emit('event1'));
    assert.equal(event1count, 1);

    assert.strictEqual(true, emitter.emit('event1'));
    assert.equal(event1count, 2);

    assert.strictEqual(emitter, emitter.off('event1', event1handler));
    assert.strictEqual(true, emitter.emit('event1'));
    assert.equal(event1count, 2);

console.log('emiting three event listeners');
    var event2count1 = 0;
    var event2count2 = 0;
    var event2count3 = 0;
    var event2handler1 = function() { event2count1++; };
    var event2handler2 = function() { event2count2++; };
    var event2handler3 = function() { event2count3++; };
    assert.strictEqual(emitter, emitter.on('event2', event2handler1));
    assert.strictEqual(emitter, emitter.on('event2', event2handler2));
    assert.strictEqual(emitter, emitter.on('event2', event2handler3));

    assert.strictEqual(true, emitter.emit('event2'));
    assert.equal(event2count1, 1);
    assert.equal(event2count2, 1);
    assert.equal(event2count3, 1);

    assert.strictEqual(true, emitter.emit('event2'));
    assert.equal(event2count1, 2);
    assert.equal(event2count2, 2);
    assert.equal(event2count3, 2);

    assert.strictEqual(emitter, emitter.off('event2', event2handler1));
    assert.strictEqual(true, emitter.emit('event2'));
    assert.equal(event2count1, 2);
    assert.equal(event2count2, 3);
    assert.equal(event2count3, 3);

    assert.strictEqual(emitter, emitter.off('event2', event2handler3));
    assert.strictEqual(true, emitter.emit('event2'));
    assert.equal(event2count1, 2);
    assert.equal(event2count2, 4);
    assert.equal(event2count3, 3);

    assert.strictEqual(emitter, emitter.off('event2', event2handler2));
    assert.strictEqual(true, emitter.emit('event2'));
    assert.equal(event2count1, 2);
    assert.equal(event2count2, 4);
    assert.equal(event2count3, 3);

console.log('emiting one event listener and passing args to it');
    var event3count = 0;
    var event3handler = function(arg1) { assert.equal(arg1, 'one'); event3count++; };
    assert.strictEqual(emitter, emitter.on('event3', event3handler));

    assert.strictEqual(true, emitter.emit('event3', 'one'));
    assert.equal(event3count, 1);

    // listener expects an arg, so throws an error if you do not send one
    assert.throws(function() {
    assert.strictEqual(true, emitter.emit('event3'));
    },'AssertionError: "undefined" == "one"');

console.log('once function');
    var event4count = 0;
    var event4handler = function() { event4count++; };
    assert.strictEqual(emitter, emitter.once('event4', event4handler));

    assert.strictEqual(true, emitter.emit('event4'));
    assert.equal(event4count, 1);

    assert.strictEqual(true, emitter.emit('event4'));
    assert.equal(event4count, 1);

console.log('removing all listeners for an event');
    var event5count1 = 0;
    var event5count2 = 0;
    var event5count3 = 0;
    var event5handler1 = function() { event5count1++; };
    var event5handler2 = function() { event5count2++; };
    var event5handler3 = function() { event5count3++; };
    assert.strictEqual(emitter, emitter.on('event5', event5handler1));
    assert.strictEqual(emitter, emitter.on('event5', event5handler2));
    assert.strictEqual(emitter, emitter.on('event5', event5handler3));

    assert.strictEqual(true, emitter.emit('event5'));
    assert.equal(event5count1, 1);
    assert.equal(event5count2, 1);
    assert.equal(event5count3, 1);

    assert.strictEqual(emitter, emitter.off('event5'));
    assert.strictEqual(true, emitter.emit('event5'));
    assert.equal(event5count1, 1);
    assert.equal(event5count2, 1);
    assert.equal(event5count3, 1);

console.log('resetting');
    var event6count = 0;
    var event7count = 0;
    var event8count = 0;
    var event6handler = function() { event6count++; };
    var event7handler = function() { event7count++; };
    var event8handler = function() { event8count++; };
    assert.strictEqual(emitter, emitter.on('event6', event6handler));
    assert.strictEqual(emitter, emitter.on('event7', event7handler));
    assert.strictEqual(emitter, emitter.on('event8', event8handler));

    assert.strictEqual(true, emitter.emit('event6'));
    assert.equal(event6count, 1);
    assert.equal(event7count, 0);
    assert.equal(event8count, 0);

    assert.strictEqual(true, emitter.emit('event7'));
    assert.equal(event6count, 1);
    assert.equal(event7count, 1);
    assert.equal(event8count, 0);

    assert.strictEqual(true, emitter.emit('event8'));
    assert.equal(event6count, 1);
    assert.equal(event7count, 1);
    assert.equal(event8count, 1);

    assert.strictEqual(emitter, telegraph(emitter));
    assert.strictEqual(true, emitter.emit('event6'));
    assert.strictEqual(true, emitter.emit('event7'));
    assert.strictEqual(true, emitter.emit('event8'));
    assert.equal(event6count, 1);
    assert.equal(event7count, 1);
    assert.equal(event8count, 1);

console.log('cancelling');
    var event9count = 0;
    var event9handler = function() { event9count++; };
    var event9cancelhandler = function() { return false; };
    assert.strictEqual(emitter, emitter.on('event9', event9handler));
    assert.strictEqual(emitter, emitter.on('event9', event9cancelhandler));
    assert.strictEqual(emitter, emitter.on('event9', event9handler));

    assert.strictEqual(false, emitter.emit('event9'));
    assert.equal(event9count, 1);

    assert.strictEqual(emitter, emitter.off('event9', event9cancelhandler));
    assert.strictEqual(true, emitter.emit('event9'));
    assert.equal(event9count, 3);

console.log('constructor paradigm');
    var event9count = 0;

    function Obj() {
        telegraph(this);
    }
    var obj = new Obj();

    var event9handler = function() { event9count++; };
    assert.strictEqual(obj, obj.on('event9', event9handler));

    assert.strictEqual(true, obj.emit('event9'));
    assert.equal(event9count, 1);

    assert.strictEqual(true, obj.emit('event9'));
    assert.equal(event9count, 2);

    assert.strictEqual(obj, obj.off('event9', event9handler));
    assert.strictEqual(true, obj.emit('event9'));
    assert.equal(event9count, 2);

(function() {
    console.log('mutate during emit');

    var emitter = telegraph();

    var i = 0;
    var count = function() { i++; };
    var countAndAdd = function() {
        i++;
        assert.strictEqual(emitter, emitter.on('mut', countAndAdd));
    };

    assert.strictEqual(emitter, emitter.on('mut', count));
    assert.strictEqual(emitter, emitter.on('mut', countAndAdd));

    assert.strictEqual(true, emitter.emit('mut'));
    assert.strictEqual(2, i);

    assert.strictEqual(true, emitter.emit('mut'));
    assert.strictEqual(5, i);

    assert.strictEqual(true, emitter.emit('mut'));
    assert.strictEqual(10, i);
})();