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import nitt from '.';
it('should default export be a function', () => {
expect(nitt).toBeInstanceOf(Function);
});
describe('nitt#', () => {
let events, inst;
beforeEach(() => {
events = Object.create(null);
inst = nitt(events);
});
describe('on()', () => {
it('should be a function', () => {
expect(inst).toHaveProperty('on');
expect(inst.on).toBeInstanceOf(Function);
});
it('should register handler for new type', () => {
let foo = () => {};
inst.on('foo', foo);
expect(events).toHaveProperty('foo');
expect(events.foo).toEqual([foo]);
});
it('should register handlers for any type strings', () => {
let foo = () => {};
inst.on('constructor', foo);
expect(events).toHaveProperty('constructor');
expect(events.constructor).toEqual([foo]);
});
it('should append handler for existing type', () => {
let foo = () => {};
let bar = () => {};
inst.on('foo', foo);
inst.on('foo', bar);
expect(events).toHaveProperty('foo');
expect(events.foo).toEqual([foo, bar]);
});
it('should NOT normalize case', () => {
let foo = () => {};
inst.on('FOO', foo);
inst.on('Bar', foo);
inst.on('baz:baT!', foo);
expect(events).toHaveProperty('FOO');
expect(events.FOO).toEqual([foo]);
expect(events).not.toHaveProperty('foo');
expect(events).toHaveProperty('Bar');
expect(events.Bar).toEqual([foo]);
expect(events).not.toHaveProperty('bar');
expect(events).toHaveProperty('baz:baT!');
expect(events['baz:baT!']).toEqual([foo]);
});
});
describe('once()', () => {
it('should execute handler just once', () => {
let foo = jest.fn();
inst.once('foo', foo);
inst.emit('foo', 1);
inst.emit('foo', 2);
expect(foo).toBeCalledTimes(1);
expect(foo).toBeCalledWith(1);
});
it('should remove the handler once is executed', () => {
let foo = jest.fn();
inst.once('foo', foo);
expect(events.foo).toHaveLength(1);
inst.emit('foo', 1);
expect(events.foo).toHaveLength(0);
});
});
describe('when()', () => {
it('should return a promise', () => {
let foo = jest.fn();
const result = inst.when('foo');
expect(result).toBeInstanceOf(Promise);
});
it('should resolve with the event', async () => {
const promise = inst.when('foo');
inst.emit('foo', 'event data');
expect(await promise).toEqual('event data');
});
});
describe('off()', () => {
it('should be a function', () => {
expect(inst).toHaveProperty('off');
expect(inst.off).toBeInstanceOf(Function);
});
it('should remove handler for type', () => {
let foo = () => {};
inst.on('foo', foo);
inst.off('foo', foo);
expect(events).toHaveProperty('foo');
expect(events.foo).toHaveLength(0);
});
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).toHaveProperty('FOO');
expect(events.FOO).toHaveLength(0);
expect(events).not.toHaveProperty('foo');
expect(events).toHaveProperty('Bar');
expect(events.Bar).toHaveLength(0);
expect(events).not.toHaveProperty('bar');
expect(events).toHaveProperty('baz:bat!');
expect(events['baz:bat!']).toHaveLength(1);
});
});
describe('emit()', () => {
it('should be a function', () => {
expect(inst).toHaveProperty('emit');
expect(inst.emit).toBeInstanceOf(Function);
});
it('should invoke handler for type', () => {
let event = { a: 'b' };
inst.on('foo', (one, two) => {
expect(one).toEqual(event);
expect(two).toBe(undefined);
});
inst.emit('foo', event);
});
it('should NOT ignore case', () => {
let onFoo = jest.fn(),
onFOO = jest.fn();
events.Foo = [onFoo];
events.FOO = [onFOO];
inst.emit('Foo', 'Foo arg');
inst.emit('FOO', 'FOO arg');
expect(onFoo).toHaveBeenCalledTimes(1);
expect(onFoo).toHaveBeenCalledWith('Foo arg');
expect(onFOO).toHaveBeenCalledTimes(1);
expect(onFOO).toHaveBeenCalledWith('FOO arg');
});
it('should invoke * handlers', () => {
let star = jest.fn(),
ea = { a: 'a' },
eb = { b: 'b' };
events['*'] = [star];
inst.emit('foo', ea);
expect(star).toHaveBeenCalledTimes(1);
expect(star).toHaveBeenCalledWith('foo', ea);
star.mockReset();
inst.emit('bar', eb);
expect(star).toHaveBeenCalledTimes(1);
expect(star).toHaveBeenCalledWith('bar', eb);
});
});
});
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