import { Binder } from './binder';

describe('binder tests', () => {
  let binder;

  beforeEach(() => {
    binder = new Binder();
  });

  it('should return an empty array for non existing extension points', () => {
    const extensions = binder.getExtensions('hitchhiker');
    expect(extensions).toEqual([]);
  });

  it('should return the binded extensions', () => {
    binder.bind('hitchhicker.trillian', 'heartOfGold');
    binder.bind('hitchhicker.trillian', 'earth');

    const extensions = binder.getExtensions('hitchhicker.trillian');
    expect(extensions).toEqual(['heartOfGold', 'earth']);
  });

  it('should return the first bound extension', () => {
    binder.bind('hitchhicker.trillian', 'heartOfGold');
    binder.bind('hitchhicker.trillian', 'earth');

    expect(binder.getExtension('hitchhicker.trillian')).toBe('heartOfGold');
  });

  it('should return null if no extension was bound', () => {
    expect(binder.getExtension('hitchhicker.trillian')).toBe(null);
  });

  it('should return true, if an extension is bound', () => {
    binder.bind('hitchhicker.trillian', 'heartOfGold');
    expect(binder.hasExtension('hitchhicker.trillian')).toBe(true);
  });

  it('should return false, if no extension is bound', () => {
    expect(binder.hasExtension('hitchhicker.trillian')).toBe(false);
  });

  it('should return only extensions which predicates matches', () => {
    binder.bind(
      'hitchhicker.trillian',
      'heartOfGold',
      (props: object) => props.category === 'a',
    );
    binder.bind(
      'hitchhicker.trillian',
      'earth',
      (props: object) => props.category === 'b',
    );
    binder.bind(
      'hitchhicker.trillian',
      'earth2',
      (props: object) => props.category === 'a',
    );

    const extensions = binder.getExtensions('hitchhicker.trillian', {
      category: 'b',
    });
    expect(extensions).toEqual(['earth']);
  });
});