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6473e9c13d
PR-URL: https://github.com/nodejs/node/pull/46523 Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
54 lines
1.8 KiB
JavaScript
54 lines
1.8 KiB
JavaScript
'use strict';
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const common = require('../common');
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const EventEmitter = require('events');
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const assert = require('assert');
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const EE = new EventEmitter();
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const handler = common.mustCall(undefined, 3);
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const anotherHandler = common.mustCall();
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assert.strictEqual(EE.listenerCount('event'), 0);
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assert.strictEqual(EE.listenerCount('event', handler), 0);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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EE.on('event', handler);
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assert.strictEqual(EE.listenerCount('event'), 1);
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assert.strictEqual(EE.listenerCount('event', handler), 1);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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EE.once('event', anotherHandler);
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assert.strictEqual(EE.listenerCount('event'), 2);
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assert.strictEqual(EE.listenerCount('event', handler), 1);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 1);
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assert.strictEqual(EE.listenerCount('another-event'), 0);
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assert.strictEqual(EE.listenerCount('another-event', handler), 0);
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assert.strictEqual(EE.listenerCount('another-event', anotherHandler), 0);
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EE.once('event', handler);
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assert.strictEqual(EE.listenerCount('event'), 3);
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assert.strictEqual(EE.listenerCount('event', handler), 2);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 1);
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EE.emit('event');
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assert.strictEqual(EE.listenerCount('event'), 1);
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assert.strictEqual(EE.listenerCount('event', handler), 1);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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EE.emit('event');
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assert.strictEqual(EE.listenerCount('event'), 1);
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assert.strictEqual(EE.listenerCount('event', handler), 1);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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EE.off('event', handler);
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assert.strictEqual(EE.listenerCount('event'), 0);
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assert.strictEqual(EE.listenerCount('event', handler), 0);
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assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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