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'use strict';
const common = require('../common');
const EventEmitter = require('events');
const assert = require('assert');
const EE = new EventEmitter();
const handler = common.mustCall(undefined, 3);
const anotherHandler = common.mustCall();
assert.strictEqual(EE.listenerCount('event'), 0);
assert.strictEqual(EE.listenerCount('event', handler), 0);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
EE.on('event', handler);
assert.strictEqual(EE.listenerCount('event'), 1);
assert.strictEqual(EE.listenerCount('event', handler), 1);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
EE.once('event', anotherHandler);
assert.strictEqual(EE.listenerCount('event'), 2);
assert.strictEqual(EE.listenerCount('event', handler), 1);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 1);
assert.strictEqual(EE.listenerCount('another-event'), 0);
assert.strictEqual(EE.listenerCount('another-event', handler), 0);
assert.strictEqual(EE.listenerCount('another-event', anotherHandler), 0);
EE.once('event', handler);
assert.strictEqual(EE.listenerCount('event'), 3);
assert.strictEqual(EE.listenerCount('event', handler), 2);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 1);
EE.emit('event');
assert.strictEqual(EE.listenerCount('event'), 1);
assert.strictEqual(EE.listenerCount('event', handler), 1);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
EE.emit('event');
assert.strictEqual(EE.listenerCount('event'), 1);
assert.strictEqual(EE.listenerCount('event', handler), 1);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
EE.off('event', handler);
assert.strictEqual(EE.listenerCount('event'), 0);
assert.strictEqual(EE.listenerCount('event', handler), 0);
assert.strictEqual(EE.listenerCount('event', anotherHandler), 0);
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