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);
}