import substractFromArray from '../helpers/substractFromArray';

describe('substractFromArray', () => {
  it('keeps the same array if item doesnt exist', () => {
    const arr = [1, 2, 3];
    expect(substractFromArray(arr, 4)).toEqual([1, 2, 3]);
  });

  it('removes the item if already exists', () => {
    const arr = [1, 2, 3];
    expect(substractFromArray(arr, 1)).toEqual([2, 3]);
    // Should not affect the original array
    expect(arr).toEqual(arr);
  });

  it('returns an empty array if is not array', () => {
    expect(substractFromArray(null, 'whatever'))
      .toEqual([]);
  });

  it('removes an existing item for objects', () => {
    const arr = [{ a: 1 }, { b: '2' }, { three: '3' }];
    expect(substractFromArray(arr, { b: '2' }))
      .toEqual([{ a: 1 }, { three: '3' }]);
  });
});