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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( () => {
inst = mitt();
events = inst.all;
});
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 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!').that.is.empty;
});
});
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 invoke handler with multiple (max 2) arguments', () => {
inst.on('foo', (aaa, bbb) => {
expect(aaa).to.be.equal(111);
expect(bbb).to.be.equal(222);
});
inst.emit('foo', 111, 222);
});
it('should NOT ignore case', () => {
let foo = spy(),
bar = spy(),
num = 123;
events.Foo = [foo];
events.FOO = [bar];
inst.emit('FOO', num);
inst.emit('Foo', num);
let args1 = foo.args[0];
let args2 = bar.args[0];
expect(foo).to.have.been.calledOnce;
expect(bar).to.have.been.calledOnce;
expect(args1).to.be.deep.equal([num, undefined]);
expect(args2).to.be.deep.equal([num, undefined]);
});
it('should invoke * handlers', () => {
let star = spy(),
aa = 'bb';
events['*'] = [star];
inst.emit('foo', aa);
inst.emit('bar', aa);
let args1 = star.args[0],
args2 = star.args[1];
expect(star).to.have.been.calledTwice;
expect(args1).to.deep.equal(['foo', aa, undefined]);
expect(args2).to.deep.equal(['bar', aa, undefined]);
});
});
});
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