I am using ASP.NET Core 2.2, EF Core and MOQ. When I run the test I am getting this error:
Message: System.NotSupportedException : Invalid setup on a non-virtual (overridable in VB) member: x => x.Movies
What I am doing wrong?
public class MovieRepositoryTest
{
private readonly MovieRepository _sut;
public MovieRepositoryTest()
{
var moviesMock = CreateDbSetMock(GetFakeListOfMovies());
var mockDbContext = new Mock<MovieDbContext>();
mockDbContext.Setup(x => x.Movies).Returns(moviesMock.Object);
_sut = new MovieRepository(mockDbContext.Object);
}
[Fact]
public void GetAll_WhenCalled_ReturnsAllItems()
{
//Act
var items = _sut.GetAll();
//Assert
Assert.Equal(3, items.Count());
}
private IEnumerable<Movie> GetFakeListOfMovies()
{
var movies = new List<Movie>
{
new Movie {Id = 1, Title = "Movie 1", YearOfRelease = 2018, Genre = "Action"},
new Movie {Id = 2, Title = "Movie 2", YearOfRelease = 2018, Genre = "Action"},
new Movie {Id = 3, Title = "Movie 3", YearOfRelease = 2019, Genre = "Action"}
};
return movies;
}
private static Mock<DbSet<T>> CreateDbSetMock<T>(IEnumerable<T> elements) where T : class
{
var elementsAsQueryable = elements.AsQueryable();
var dbSetMock = new Mock<DbSet<T>>();
dbSetMock.As<IQueryable<T>>().Setup(m => m.Provider).Returns(elementsAsQueryable.Provider);
dbSetMock.As<IQueryable<T>>().Setup(m => m.Expression).Returns(elementsAsQueryable.Expression);
dbSetMock.As<IQueryable<T>>().Setup(m => m.ElementType).Returns(elementsAsQueryable.ElementType);
dbSetMock.As<IQueryable<T>>().Setup(m => m.GetEnumerator()).Returns(elementsAsQueryable.GetEnumerator());
return dbSetMock;
}
}
And this is my DB Context, with the Movie
dbSet:
public class MovieDbContext: DbContext
{
public MovieDbContext(DbContextOptions<MovieDbContext> options) : base(options)
{
}
public DbSet<Movie> Movies { get; set; }
}
And the Repository with the method GetAll
to be tested:
public class MovieRepository: IMovieRepository
{
private readonly MovieDbContext _moviesDbContext;
public MovieRepository(MovieDbContext moviesDbContext)
{
_moviesDbContext = moviesDbContext;
}
public IEnumerable<Movie> GetAll()
{
return _moviesDbContext.Movies;
}
}
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