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 | {
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27 | var ee = new EventEmitter();
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28 | var events_new_listener_emitted = [];
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29 | var listeners_new_listener_emitted = [];
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30 |
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31 | // Sanity check
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32 | assert.strictEqual(ee.addListener, ee.on);
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33 |
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34 | ee.on('newListener', function(event, listener) {
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35 | // Don't track newListener listeners.
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36 | if (event === 'newListener')
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37 | return;
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38 |
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39 | events_new_listener_emitted.push(event);
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40 | listeners_new_listener_emitted.push(listener);
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41 | });
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42 |
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43 | var hello = common.mustCall(function(a, b) {
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44 | assert.strictEqual('a', a);
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45 | assert.strictEqual('b', b);
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46 | });
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47 |
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48 | ee.once('newListener', function(name, listener) {
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49 | assert.strictEqual(name, 'hello');
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50 | assert.strictEqual(listener, hello);
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51 |
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52 | var listeners = this.listeners('hello');
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53 | assert.ok(Array.isArray(listeners));
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54 | assert.strictEqual(listeners.length, 0);
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55 | });
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56 |
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57 | ee.on('hello', hello);
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58 | ee.once('foo', assert.fail);
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59 |
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60 | assert.ok(Array.isArray(events_new_listener_emitted));
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61 | assert.strictEqual(events_new_listener_emitted.length, 2);
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62 | assert.strictEqual(events_new_listener_emitted[0], 'hello');
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63 | assert.strictEqual(events_new_listener_emitted[1], 'foo');
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64 |
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65 | assert.ok(Array.isArray(listeners_new_listener_emitted));
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66 | assert.strictEqual(listeners_new_listener_emitted.length, 2);
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67 | assert.strictEqual(listeners_new_listener_emitted[0], hello);
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68 | assert.strictEqual(listeners_new_listener_emitted[1], assert.fail);
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69 |
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70 | ee.emit('hello', 'a', 'b');
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71 | }
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72 |
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73 | // just make sure that this doesn't throw:
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74 | {
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75 | var f = new EventEmitter();
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76 |
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77 | f.setMaxListeners(0);
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78 | }
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79 |
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80 | {
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81 | var listen1 = function() {};
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82 | var listen2 = function() {};
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83 | var ee = new EventEmitter();
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84 |
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85 | ee.once('newListener', function() {
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86 | var listeners = ee.listeners('hello');
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87 | assert.ok(Array.isArray(listeners));
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88 | assert.strictEqual(listeners.length, 0);
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89 | ee.once('newListener', function() {
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90 | var listeners = ee.listeners('hello');
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91 | assert.ok(Array.isArray(listeners));
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92 | assert.strictEqual(listeners.length, 0);
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93 | });
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94 | ee.on('hello', listen2);
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95 | });
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96 | ee.on('hello', listen1);
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97 | // The order of listeners on an event is not always the order in which the
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98 | // listeners were added.
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99 | var listeners = ee.listeners('hello');
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100 | assert.ok(Array.isArray(listeners));
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101 | assert.strictEqual(listeners.length, 2);
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102 | assert.strictEqual(listeners[0], listen2);
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103 | assert.strictEqual(listeners[1], listen1);
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104 | }
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105 |
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106 | // Verify that the listener must be a function
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107 | assert.throws(function() {
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108 | var ee = new EventEmitter();
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109 |
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110 | ee.on('foo', null);
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111 | }, /^TypeError: The "listener" argument must be of type Function. Received type object$/);
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