public async Task UpdateAuthor_WhenCallingValidRequest_ShouldReturnOk()
{
// Arrange
_authorServiceMock.Setup(a =>
a.UpdateAuthor(It.IsAny <Guid>(), It.IsAny <AuthorDto>()));
// Act
IActionResult actionResult = await _authorsApiController
.UpdateAuthor(new Guid(), new AuthorDto());
NoContentResult result = actionResult as NoContentResult; // null if cast fails
// Assert
Assert.IsNotNull(actionResult);
Assert.IsNotNull(result);
}