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 | var common = require('./common');
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23 | var assert = require('assert');
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24 | var EventEmitter = require('../');
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25 |
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26 | var listener1 = function listener1() {};
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27 | var listener2 = function listener2() {};
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28 |
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29 | {
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30 | var ee = new EventEmitter();
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31 | ee.on('hello', listener1);
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32 | ee.on('removeListener', common.mustCall(function(name, cb) {
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33 | assert.strictEqual(name, 'hello');
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34 | assert.strictEqual(cb, listener1);
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35 | }));
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36 | ee.removeListener('hello', listener1);
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37 | var listeners = ee.listeners('hello');
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38 | assert.ok(Array.isArray(listeners));
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39 | assert.strictEqual(listeners.length, 0);
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40 | }
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41 |
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42 | {
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43 | var ee = new EventEmitter();
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44 | ee.on('hello', listener1);
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45 | ee.on('removeListener', common.mustNotCall());
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46 | ee.removeListener('hello', listener2);
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47 |
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48 | var listeners = ee.listeners('hello');
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49 | assert.ok(Array.isArray(listeners));
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50 | assert.strictEqual(listeners.length, 1);
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51 | assert.strictEqual(listeners[0], listener1);
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52 | }
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53 |
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54 | {
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55 | var ee = new EventEmitter();
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56 | ee.on('hello', listener1);
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57 | ee.on('hello', listener2);
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58 |
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59 | var listeners;
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60 | ee.once('removeListener', common.mustCall(function(name, cb) {
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61 | assert.strictEqual(name, 'hello');
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62 | assert.strictEqual(cb, listener1);
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63 | listeners = ee.listeners('hello');
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64 | assert.ok(Array.isArray(listeners));
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65 | assert.strictEqual(listeners.length, 1);
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66 | assert.strictEqual(listeners[0], listener2);
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67 | }));
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68 | ee.removeListener('hello', listener1);
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69 | listeners = ee.listeners('hello');
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70 | assert.ok(Array.isArray(listeners));
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71 | assert.strictEqual(listeners.length, 1);
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72 | assert.strictEqual(listeners[0], listener2);
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73 | ee.once('removeListener', common.mustCall(function(name, cb) {
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74 | assert.strictEqual(name, 'hello');
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75 | assert.strictEqual(cb, listener2);
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76 | listeners = ee.listeners('hello');
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77 | assert.ok(Array.isArray(listeners));
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78 | assert.strictEqual(listeners.length, 0);
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79 | }));
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80 | ee.removeListener('hello', listener2);
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81 | listeners = ee.listeners('hello');
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82 | assert.ok(Array.isArray(listeners));
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83 | assert.strictEqual(listeners.length, 0);
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84 | }
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85 |
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86 | {
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87 | var ee = new EventEmitter();
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88 |
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89 | function remove1() {
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90 | assert.fail('remove1 should not have been called');
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91 | }
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92 |
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93 | function remove2() {
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94 | assert.fail('remove2 should not have been called');
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95 | }
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96 |
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97 | ee.on('removeListener', common.mustCall(function(name, cb) {
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98 | if (cb !== remove1) return;
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99 | this.removeListener('quux', remove2);
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100 | this.emit('quux');
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101 | }, 2));
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102 | ee.on('quux', remove1);
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103 | ee.on('quux', remove2);
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104 | ee.removeListener('quux', remove1);
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105 | }
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106 |
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107 | {
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108 | var ee = new EventEmitter();
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109 | ee.on('hello', listener1);
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110 | ee.on('hello', listener2);
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111 |
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112 | var listeners;
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113 | ee.once('removeListener', common.mustCall(function(name, cb) {
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114 | assert.strictEqual(name, 'hello');
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115 | assert.strictEqual(cb, listener1);
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116 | listeners = ee.listeners('hello');
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117 | assert.ok(Array.isArray(listeners));
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118 | assert.strictEqual(listeners.length, 1);
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119 | assert.strictEqual(listeners[0], listener2);
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120 | ee.once('removeListener', common.mustCall(function(name, cb) {
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121 | assert.strictEqual(name, 'hello');
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122 | assert.strictEqual(cb, listener2);
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123 | listeners = ee.listeners('hello');
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124 | assert.ok(Array.isArray(listeners));
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125 | assert.strictEqual(listeners.length, 0);
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126 | }));
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127 | ee.removeListener('hello', listener2);
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128 | listeners = ee.listeners('hello');
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129 | assert.ok(Array.isArray(listeners));
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130 | assert.strictEqual(listeners.length, 0);
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131 | }));
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132 | ee.removeListener('hello', listener1);
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133 | listeners = ee.listeners('hello');
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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 | var ee = new EventEmitter();
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140 | var listener3 = common.mustCall(function() {
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141 | ee.removeListener('hello', listener4);
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142 | }, 2);
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143 | var listener4 = common.mustCall();
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144 |
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145 | ee.on('hello', listener3);
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146 | ee.on('hello', listener4);
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147 |
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148 | // listener4 will still be called although it is removed by listener 3.
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149 | ee.emit('hello');
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150 | // This is so because the interal listener array at time of emit
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151 | // was [listener3,listener4]
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152 |
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153 | // Interal listener array [listener3]
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154 | ee.emit('hello');
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155 | }
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156 |
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157 | {
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158 | var ee = new EventEmitter();
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159 |
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160 | ee.once('hello', listener1);
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161 | ee.on('removeListener', common.mustCall(function(eventName, listener) {
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162 | assert.strictEqual(eventName, 'hello');
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163 | assert.strictEqual(listener, listener1);
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164 | }));
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165 | ee.emit('hello');
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166 | }
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167 |
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168 | {
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169 | var ee = new EventEmitter();
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170 |
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171 | assert.strictEqual(ee, ee.removeListener('foo', function() {}));
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172 | }
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173 |
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174 | // Verify that the removed listener must be a function
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175 | assert.throws(function() {
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176 | var ee = new EventEmitter();
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177 |
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178 | ee.removeListener('foo', null);
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179 | }, /^TypeError: The "listener" argument must be of type Function\. Received type object$/);
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180 |
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181 | {
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182 | var ee = new EventEmitter();
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183 | var listener = function() {};
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184 | ee._events = undefined;
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185 | var e = ee.removeListener('foo', listener);
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186 | assert.strictEqual(e, ee);
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187 | }
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188 |
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189 | {
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190 | var ee = new EventEmitter();
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191 |
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192 | ee.on('foo', listener1);
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193 | ee.on('foo', listener2);
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194 | var listeners = ee.listeners('foo');
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195 | assert.ok(Array.isArray(listeners));
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196 | assert.strictEqual(listeners.length, 2);
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197 | assert.strictEqual(listeners[0], listener1);
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198 | assert.strictEqual(listeners[1], listener2);
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199 |
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200 | ee.removeListener('foo', listener1);
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201 | assert.strictEqual(ee._events.foo, listener2);
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202 |
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203 | ee.on('foo', listener1);
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204 | listeners = ee.listeners('foo');
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205 | assert.ok(Array.isArray(listeners));
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206 | assert.strictEqual(listeners.length, 2);
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207 | assert.strictEqual(listeners[0], listener2);
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208 | assert.strictEqual(listeners[1], listener1);
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209 |
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210 | ee.removeListener('foo', listener1);
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211 | assert.strictEqual(ee._events.foo, listener2);
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212 | }
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