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import mitt from '../src';
import chai, { expect } from 'chai';
import { spy } from 'sinon';
import sinonChai from 'sinon-chai';
chai.use(sinonChai);
it('should default export be a function', () => {
expect(mitt).to.be.a('function');
});
describe('mitt#', () => {
let events, inst;
beforeEach( () => {
events = new Map();
inst = mitt(events);
});
describe('on()', () => {
it('should be a function', () => {
expect(inst)
.to.have.property('on')
.that.is.a('function');
});
it('should register handler for new type', () => {
const foo = () => {};
inst.on('foo', foo);
expect(events.get('foo')).to.deep.equal([foo]);
});
it('should register handlers for any type strings', () => {
const foo = () => {};
inst.on('constructor', foo);
expect(events.get('constructor')).to.deep.equal([foo]);
});
it('should append handler for existing type', () => {
const foo = () => {};
const bar = () => {};
inst.on('foo', foo);
inst.on('foo', bar);
expect(events.get('foo')).to.deep.equal([foo, bar]);
});
it('should NOT normalize case', () => {
const foo = () => {};
inst.on('FOO', foo);
inst.on('Bar', foo);
inst.on('baz:baT!', foo);
expect(events.get('FOO')).to.deep.equal([foo]);
expect(events.has('foo')).to.equal(false);
expect(events.get('Bar')).to.deep.equal([foo]);
expect(events.has('bar')).to.equal(false);
expect(events.get('baz:baT!')).to.deep.equal([foo]);
});
it('can take symbols for event types', () => {
const foo = () => {};
const eventType = Symbol('eventType');
inst.on(eventType, foo);
expect(events.get(eventType)).to.deep.equal([foo]);
});
});
describe('off()', () => {
it('should be a function', () => {
expect(inst)
.to.have.property('off')
.that.is.a('function');
});
it('should remove handler for type', () => {
const foo = () => {};
inst.on('foo', foo);
inst.off('foo', foo);
expect(events.get('foo')).to.be.empty;
});
it('should NOT normalize case', () => {
const foo = () => {};
inst.on('FOO', foo);
inst.on('Bar', foo);
inst.on('baz:bat!', foo);
inst.off('FOO', foo);
inst.off('Bar', foo);
inst.off('baz:baT!', foo);
expect(events.get('FOO')).to.be.empty;
expect(events.has('foo')).to.equal(false);
expect(events.get('Bar')).to.be.empty;
expect(events.has('bar')).to.equal(false);
expect(events.get('baz:bat!')).to.have.lengthOf(1);
});
});
describe('emit()', () => {
it('should be a function', () => {
expect(inst)
.to.have.property('emit')
.that.is.a('function');
});
it('should invoke handler for type', () => {
const event = { a: 'b' };
inst.on('foo', (one, two) => {
expect(one).to.deep.equal(event);
expect(two).to.be.an('undefined');
});
inst.emit('foo', event);
});
it('should NOT ignore case', () => {
const onFoo = spy(),
onFOO = spy();
events.set('Foo', [onFoo]);
events.set('FOO', [onFOO]);
inst.emit('Foo', 'Foo arg');
inst.emit('FOO', 'FOO arg');
expect(onFoo).to.have.been.calledOnce.and.calledWith('Foo arg');
expect(onFOO).to.have.been.calledOnce.and.calledWith('FOO arg');
});
it('should invoke * handlers', () => {
const star = spy(),
ea = { a: 'a' },
eb = { b: 'b' };
events.set('*', [star]);
inst.emit('foo', ea);
expect(star).to.have.been.calledOnce.and.calledWith('foo', ea);
star.reset();
inst.emit('bar', eb);
expect(star).to.have.been.calledOnce.and.calledWith('bar', eb);
});
});
});
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