public async Task ConfirmForMatch_ShouldNotConfirm_WhenMatchDoesNotExist() { // Arrange var responseMessage = "Specified match doesn't exist!"; _unitOfWorkMock.Setup(x => x.Matchdays.GetById(It.IsAny <int>())) .ReturnsAsync(() => null); // Act var result = await _sut.ConfirmForMatch(It.IsAny <int>(), It.IsAny <int>()); // Assert Assert.Equal(responseMessage, result.Value); }