overleaf-cep/services/web/test/frontend/utils/EventEmitterTests.js
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GitOrigin-RevId: 79c5a2d1101fcd520f3116f0f4af29d974189d94
2025-01-16 09:05:36 +00:00

79 lines
1.9 KiB
JavaScript

import { expect } from 'chai'
import sinon from 'sinon'
import EventEmitter from '@/utils/EventEmitter'
describe('EventEmitter', function () {
beforeEach(function () {
this.eventEmitter = new EventEmitter()
})
it('calls listeners', function () {
const cb1 = sinon.stub()
const cb2 = sinon.stub()
this.eventEmitter.on('foo', cb1)
this.eventEmitter.on('bar', cb2)
this.eventEmitter.trigger('foo')
expect(cb1).to.have.been.called
expect(cb2).to.not.have.been.called
})
it('calls multiple listeners', function () {
const cb1 = sinon.stub()
const cb2 = sinon.stub()
this.eventEmitter.on('foo', cb1)
this.eventEmitter.on('foo', cb2)
this.eventEmitter.trigger('foo')
expect(cb1).to.have.been.called
expect(cb2).to.have.been.called
})
it('calls listeners with namespace', function () {
const cb1 = sinon.stub()
const cb2 = sinon.stub()
this.eventEmitter.on('foo', cb1)
this.eventEmitter.on('foo.bar', cb2)
this.eventEmitter.trigger('foo')
expect(cb1).to.have.been.called
expect(cb2).to.have.been.called
})
it('removes listeners', function () {
const cb = sinon.stub()
this.eventEmitter.on('foo', cb)
this.eventEmitter.off('foo')
this.eventEmitter.trigger('foo')
expect(cb).to.not.have.been.called
})
it('removes namespaced listeners', function () {
const cb = sinon.stub()
this.eventEmitter.on('foo.bar', cb)
this.eventEmitter.off('foo.bar')
this.eventEmitter.trigger('foo')
expect(cb).to.not.have.been.called
})
it('does not remove unnamespaced listeners if off called with namespace', function () {
const cb1 = sinon.stub()
const cb2 = sinon.stub()
this.eventEmitter.on('foo', cb1)
this.eventEmitter.on('foo.bar', cb2)
this.eventEmitter.off('foo.bar')
this.eventEmitter.trigger('foo')
expect(cb1).to.have.been.called
expect(cb2).to.not.have.been.called
})
})