import {afterAll, beforeEach, describe, expect, it, mock} from 'bun:test';
import {EventEmitter} from '../../src/events';

describe(`When emitting an event`, () => {
  const eventEmitter: EventEmitter<string> = new EventEmitter<string>();

  describe(`Given a callback is subscribed`, () => {
    const mockListener = mock(() => undefined);
    const subscription = eventEmitter.subscribe(mockListener);

    describe(`Given an event is emitted`, () => {
      beforeEach(() => eventEmitter.emit('mock event'));

      it(`notifies the callback with the event`, () => expect(mockListener).toHaveBeenCalled());
    });

    afterAll(() => subscription.dispose());
  });
});