1 | // Copyright Joyent, Inc. and other Node contributors.
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2 | //
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3 | // Permission is hereby granted, free of charge, to any person obtaining a
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4 | // copy of this software and associated documentation files (the
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5 | // "Software"), to deal in the Software without restriction, including
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6 | // without limitation the rights to use, copy, modify, merge, publish,
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7 | // distribute, sublicense, and/or sell copies of the Software, and to permit
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8 | // persons to whom the Software is furnished to do so, subject to the
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9 | // following conditions:
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10 | //
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11 | // The above copyright notice and this permission notice shall be included
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12 | // in all copies or substantial portions of the Software.
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13 | //
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14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 | // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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16 | // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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17 | // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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18 | // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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19 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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20 | // USE OR OTHER DEALINGS IN THE SOFTWARE.
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21 |
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22 | require('./common');
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23 | var assert = require('assert');
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24 | var events = require('../');
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25 | var util = require('util');
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26 |
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27 | function listener() {}
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28 | function listener2() {}
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29 | function listener3() {
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30 | return 0;
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31 | }
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32 | function listener4() {
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33 | return 1;
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34 | }
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35 |
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36 | function TestStream() {}
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37 | util.inherits(TestStream, events.EventEmitter);
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38 |
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39 | {
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40 | var ee = new events.EventEmitter();
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41 | ee.on('foo', listener);
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42 | var fooListeners = ee.listeners('foo');
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43 |
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44 | var listeners = ee.listeners('foo');
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45 | assert.ok(Array.isArray(listeners));
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46 | assert.strictEqual(listeners.length, 1);
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47 | assert.strictEqual(listeners[0], listener);
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48 |
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49 | ee.removeAllListeners('foo');
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50 | listeners = ee.listeners('foo');
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51 | assert.ok(Array.isArray(listeners));
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52 | assert.strictEqual(listeners.length, 0);
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53 |
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54 | assert.ok(Array.isArray(fooListeners));
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55 | assert.strictEqual(fooListeners.length, 1);
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56 | assert.strictEqual(fooListeners[0], listener);
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57 | }
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58 |
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59 | {
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60 | var ee = new events.EventEmitter();
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61 | ee.on('foo', listener);
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62 |
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63 | var eeListenersCopy = ee.listeners('foo');
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64 | assert.ok(Array.isArray(eeListenersCopy));
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65 | assert.strictEqual(eeListenersCopy.length, 1);
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66 | assert.strictEqual(eeListenersCopy[0], listener);
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67 |
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68 | var listeners = ee.listeners('foo');
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69 | assert.ok(Array.isArray(listeners));
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70 | assert.strictEqual(listeners.length, 1);
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71 | assert.strictEqual(listeners[0], listener);
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72 |
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73 | eeListenersCopy.push(listener2);
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74 | listeners = ee.listeners('foo');
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75 |
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76 | assert.ok(Array.isArray(listeners));
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77 | assert.strictEqual(listeners.length, 1);
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78 | assert.strictEqual(listeners[0], listener);
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79 |
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80 | assert.strictEqual(eeListenersCopy.length, 2);
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81 | assert.strictEqual(eeListenersCopy[0], listener);
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82 | assert.strictEqual(eeListenersCopy[1], listener2);
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83 | }
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84 |
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85 | {
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86 | var ee = new events.EventEmitter();
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87 | ee.on('foo', listener);
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88 | var eeListenersCopy = ee.listeners('foo');
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89 | ee.on('foo', listener2);
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90 |
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91 | var listeners = ee.listeners('foo');
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92 | assert.ok(Array.isArray(listeners));
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93 | assert.strictEqual(listeners.length, 2);
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94 | assert.strictEqual(listeners[0], listener);
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95 | assert.strictEqual(listeners[1], listener2);
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96 |
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97 | assert.ok(Array.isArray(eeListenersCopy));
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98 | assert.strictEqual(eeListenersCopy.length, 1);
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99 | assert.strictEqual(eeListenersCopy[0], listener);
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100 | }
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101 |
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102 | {
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103 | var ee = new events.EventEmitter();
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104 | ee.once('foo', listener);
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105 | var listeners = ee.listeners('foo');
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106 | assert.ok(Array.isArray(listeners));
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107 | assert.strictEqual(listeners.length, 1);
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108 | assert.strictEqual(listeners[0], listener);
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109 | }
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110 |
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111 | {
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112 | var ee = new events.EventEmitter();
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113 | ee.on('foo', listener);
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114 | ee.once('foo', listener2);
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115 |
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116 | var listeners = ee.listeners('foo');
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117 | assert.ok(Array.isArray(listeners));
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118 | assert.strictEqual(listeners.length, 2);
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119 | assert.strictEqual(listeners[0], listener);
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120 | assert.strictEqual(listeners[1], listener2);
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121 | }
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122 |
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123 | {
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124 | var ee = new events.EventEmitter();
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125 | ee._events = undefined;
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126 | var listeners = ee.listeners('foo');
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127 | assert.ok(Array.isArray(listeners));
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128 | assert.strictEqual(listeners.length, 0);
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129 | }
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130 |
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131 | {
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132 | var s = new TestStream();
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133 | var listeners = s.listeners('foo');
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134 | assert.ok(Array.isArray(listeners));
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135 | assert.strictEqual(listeners.length, 0);
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136 | }
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137 |
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138 |
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139 | {
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140 | var ee = new events.EventEmitter();
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141 | ee.on('foo', listener);
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142 | var wrappedListener = ee.rawListeners('foo');
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143 | assert.strictEqual(wrappedListener.length, 1);
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144 | assert.strictEqual(wrappedListener[0], listener);
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145 | assert.notStrictEqual(wrappedListener, ee.rawListeners('foo'));
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146 | ee.once('foo', listener);
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147 | var wrappedListeners = ee.rawListeners('foo');
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148 | assert.strictEqual(wrappedListeners.length, 2);
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149 | assert.strictEqual(wrappedListeners[0], listener);
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150 | assert.notStrictEqual(wrappedListeners[1], listener);
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151 | assert.strictEqual(wrappedListeners[1].listener, listener);
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152 | assert.notStrictEqual(wrappedListeners, ee.rawListeners('foo'));
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153 | ee.emit('foo');
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154 | assert.strictEqual(wrappedListeners.length, 2);
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155 | assert.strictEqual(wrappedListeners[1].listener, listener);
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156 | }
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157 |
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158 | {
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159 | var ee = new events.EventEmitter();
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160 | ee.once('foo', listener3);
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161 | ee.on('foo', listener4);
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162 | var rawListeners = ee.rawListeners('foo');
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163 | assert.strictEqual(rawListeners.length, 2);
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164 | assert.strictEqual(rawListeners[0](), 0);
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165 | var rawListener = ee.rawListeners('foo');
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166 | assert.strictEqual(rawListener.length, 1);
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167 | assert.strictEqual(rawListener[0](), 1);
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168 | }
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