nestjs ts-jest - When function is called with a mock, toHaveBeenCalledWith() always succeed even when it should not

ts-jest - When function is called with a mock, toHaveBeenCalledWith() always succeed even when it should not

Open maxime-dupuis opened this issue 1 year ago • 5 comments

it('mock called with another mock', async () => {
  class Cheese {
    constructor(public name: string) {}
  }
  class Potato {
    private cheese: Cheese;
    public applyCheese(cheese: Cheese) {
      this.cheese = cheese;
    }
  }
  const mockPotato = createMock<Potato>();
  const mockCheese = createMock<Cheese>();

  mockPotato.applyCheese(mockCheese);

  expect(mockPotato.applyCheese).toHaveBeenCalledTimes(1);
  // These all pass, but they should fail because applyCheese wasn't called with these values
  expect(mockPotato.applyCheese).toHaveBeenCalledWith('kaboom');
  expect(mockPotato.applyCheese).toHaveBeenCalledWith(42);
  expect(mockPotato.applyCheese).toHaveBeenCalledWith(null);
  // This one should pass (and does)
  expect(mockPotato.applyCheese).toHaveBeenCalledWith(mockCheese);
});