public async Task Post_User_Rating_With_Created_Response()
{
// Arrange
const int articleId = 1;
var mockUserRating = new UserRating();
_articleRepository.Setup(x => x.ExistsAsync(It.IsAny <int>())).ReturnsAsync(true);
_articleRepository.Setup(x => x.AddUserRatingAsync(It.IsAny <int>(), It.IsAny <UserRating>()))
.Returns(Task.FromResult(mockUserRating));
// Act
var articlesController = new ArticlesController(_articleRepository.Object);
var actionResult = await articlesController.PostArticleUserRatingAsync(articleId, mockUserRating);
// Assert
Assert.IsType <CreatedAtActionResult>(actionResult);
}