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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 = Object.create(null);
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', () => {
let foo = () => {};
inst.on('foo', foo);
expect(events).to.have.property('foo').that.deep.equals([foo]);
});
it('should register handlers for any type strings', () => {
let foo = () => {};
inst.on('constructor', foo);
expect(events).to.have.property('constructor').that.deep.equals([foo]);
});
it('should append handler for existing type', () => {
let foo = () => {};
let bar = () => {};
inst.on('foo', foo);
inst.on('foo', bar);
expect(events).to.have.property('foo').that.deep.equals([foo, bar]);
});
it('should NOT normalize case', () => {
let foo = () => {};
inst.on('FOO', foo);
inst.on('Bar', foo);
inst.on('baz:baT!', foo);
expect(events).to.have.property('FOO').that.deep.equals([foo]);
expect(events).to.not.have.property('foo');
expect(events).to.have.property('Bar').that.deep.equals([foo]);
expect(events).to.not.have.property('bar');
expect(events).to.have.property('baz:baT!').that.deep.equals([foo]);
});
});
describe('off()', () => {
it('should be a function', () => {
expect(inst)
.to.have.property('off')
.that.is.a('function');
});
it('should remove handler for type', () => {
let foo = () => {};
inst.on('foo', foo);
inst.off('foo', foo);
expect(events).to.have.property('foo').that.is.empty;
});
it('should NOT normalize case', () => {
let 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).to.have.property('FOO').that.is.empty;
expect(events).to.not.have.property('foo');
expect(events).to.have.property('Bar').that.is.empty;
expect(events).to.not.have.property('bar');
expect(events).to.have.property('baz:bat!').with.length(1);
});
});
describe('emit()', () => {
it('should be a function', () => {
expect(inst)
.to.have.property('emit')
.that.is.a('function');
});
it('should invoke handler for type', () => {
let 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', () => {
let onFoo = spy(),
onFOO = spy();
events.Foo = [onFoo];
events.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', () => {
let star = spy(),
ea = { a: 'a' },
eb = { b: 'b' };
events['*'] = [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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