如何解决Web API Controller中的Mapper函数在单元测试期间返回null
我正在制作ASP.NET核心Web API,并且使用了Entity Framework Core。我正在尝试使用N-Unit对控制器进行单元测试 我在嘲笑映射器和存储库。这些API可以正常工作,我什至创建了前端或API,但是我在单元测试中遇到了问题。
控制器代码-
[AllowAnonymous]
[HttpGet("{id}")]
public async Task<IActionResult> GetMovie(int id)
{
var movie = await _repo.GetMovie(id);
if (movie == null)
{
return BadRequest("Object with Id not found");
}
var movieToReturn = _mapper.Map<MovieForDetailedDto>(movie);
return Ok(movieToReturn);
}
[AllowAnonymous]
[HttpPost()]
public async Task<IActionResult> AddMovie(MovieForDetailedDto movieForDetailedDto)
{
if (await _repo.MovieExists(movieForDetailedDto.ATitle))
return BadRequest("movie already exists");
else if(!ModelState.IsValid || movieForDetailedDto.ATitle == null || movieForDetailedDto.APrice == null || movieForDetailedDto.AMovieDescription ==null)
{
return BadRequest("movie details not valid");
}
var movieToCreate = _mapper.Map<TblMovie>(movieForDetailedDto);
var createdMovie = await _repo.AddMovie(movieToCreate);
return Ok(createdMovie);
}
在我所有的函数中,在将DTO映射到模型的那一行中,该行在单元测试期间返回一个空对象,但在单元测试之外它们仍然可以正常工作。
控制器的我的单元测试代码-
[TestFixture]
public class MoviesControllerTests
{
private Mock<IMovieRepository> _mockMovieRepository;
private Mock<IMapper> _mockMovieMapper;
private MoviesController _moviesController;
[Test]
public async Task CallGetRequest_WhenCalledWithId_ReturnsTheMovieWithTheSameId()
{
getMoviesHelper getMoviesHelper = new getMoviesHelper();
List<TblMovie> movieList = getMoviesHelper.getMovieFromList();
var movie = getMoviesHelper.movieById(3);
_mockMovieRepository = new Mock<IMovieRepository>();
_mockMovieMapper = new Mock<IMapper>();
_mockMovieMapper.Setup(mapper => mapper.Map<TblMovie>(It.IsAny<MovieForDetailedDto>()))
.Returns(getMoviesHelper.movieById(3));
_mockMovieRepository.Setup(repo => repo.GetMovie(3))
.ReturnsAsync(getMoviesHelper.movieById(3));
_moviesController = new MoviesController(_mockMovieRepository.Object,_mockMovieMapper.Object);
var tblMovie = await _moviesController.GetMovie(3);
var okResult = tblMovie as OkObjectResult;
//Assert.AreEqual(200,okResult.StatusCode);
Assert.NotNull(tblMovie);
Assert.IsAssignableFrom<OkObjectResult>(tblMovie);
var result = ((OkObjectResult)tblMovie).Value;
var resultValue = ((OkObjectResult)tblMovie).Value as TblMovie;
Assert.AreEqual(resultValue.ATitle,"Raging Bull");
Assert.NotNull(result);
Assert.IsAssignableFrom<TblOrder>(result);
}
[Test]
public async Task GivenAValidMovie_WhenIPostANewMovie_ThenItReturnsOkWithResponse()
{
_mockMovieRepository = new Mock<IMovieRepository>();
_mockMovieMapper = new Mock<IMapper>();
_mockMovieMapper.Setup(mapper => mapper.Map<TblMovie>(It.IsAny<MovieForDetailedDto>()))
.Returns(new TblMovie());
_mockMovieRepository.Setup(repo => repo.AddMovie(It.IsAny<TblMovie>()))
.ReturnsAsync((TblMovie movie) => movie);
_moviesController = new MoviesController(_mockMovieRepository.Object,_mockMovieMapper.Object);
var tblMovie = await _moviesController.AddMovie(new MovieForDetailedDto
{
AMovieId = 55,ATitle = "redemption",AMovieDescription = "An action comedy adventure about brilliant robotics prodigy Hiro Hamada,who finds himself in the grips of a criminal plot that threatens to destroy the fast-paced,high-tech city of San Fransokyo. With the help of his closest companion-a robot named Baymax-Hiro joins forces with a reluctant team of first-time crime fighters on a mission to save their city.",ADuration = "105 min",APrice = "10",APurchasePrice = "25",ARating = 5,AImageLink = "http://upload.wikimedia.org/wikipedia/en/4/4b/Big_Hero_6_%28film%29_poster.jpg",ATrailerLink = "//www.youtube.com/embed/z3biFxZIJOQ",AGenre = "Comedy",AWideImage = "https://github.com/tushar23091998/MovieRentalApp-FrontEnd/blob/master/src/app/images/bighero6.jpg?raw=true"
});
var okResult = tblMovie as OkObjectResult;
Assert.AreEqual(200,okResult.StatusCode);
Assert.NotNull(okResult);
Assert.IsAssignableFrom<OkObjectResult>(tblMovie);
var result = ((OkObjectResult)tblMovie).Value;
Assert.NotNull(result);
Assert.IsAssignableFrom<TblMovie>(result);
}
在测试用例和其他测试用例中,回购设置都可以正常工作,但是在定义控制器后,当我调用控制器函数获取值时,在调试中发现控制器代码中的映射器行返回null
我不确定现在如何设置模拟映射器,以及如何传递值。
解决方法
使用AutoMapper时,我们在单元测试中所做的不是模拟它,而是对其进行初始化,如此处所述:https://kenbonny.net/2018/01/15/injecting-automapper-profiles-in-tests/ 我看到这样做的缺点是,由于映射问题,您的测试可能会失败,并且未严格测试该方法。 以您的示例为例,您的设置不正确。 对于get方法测试,您应该设置为TblMovie返回MovieForDetailedDto,但是您要执行相反的操作:
_mockMovieMapper.Setup(mapper => mapper.Map<TblMovie>(It.IsAny<MovieForDetailedDto>())).Returns(getMoviesHelper.movieById(3));
应该是这样的:
var expectedMovieDto = new MovieForDetailedDto(){//insert values here}
_mockMovieMapper.Setup(mapper => mapper.Map<MovieForDetailedDto>(It.IsAny<TblMovie>())).Returns(expectedMovieDto);
对于POST方法,您将其设置为返回新的TblMovie(因此所有属性均设置为其默认值)
_mockMovieMapper.Setup(mapper => mapper.Map<TblMovie>(It.IsAny<MovieForDetailedDto>())) .Returns(new TblMovie());
应为:
var expectedMovie = new TblMovie()
{
ADuration = "some value",AGenre = "some value"
//other }
_mockMovieMapper.Setup(mapper => mapper.Map<TblMovie>(It.IsAny<MovieForDetailedDto>())).Returns(expectedMovie);
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