轉換IQueryable <T> 到DbSet <T>

Question

我不確定這是否可行，但我正在嘗試對使用DbSet的存儲庫進行單元測試。 我認為最簡單的解決方案就是制作一個Enumerable，然后用它替換DbSet，這是我的嘗試。

我正在使用C＃，EntityFramework，XUnit和Moq

[Fact]
public void SomeTest() 
{
    //arrange
    var mockContext = new Mock<MyDbContext>();
    var mockData = new List<Person>
        {
            new Person { Name = "Jim", Age = 47 }
        };
    mockContext.Setup(db => db.Persons).Returns((DbSet<Person>)mockData.AsQueryable());

    var repo = PersonRepository(mockContext.Object); 

    //act
    var result = repo.GetByFirstName("Jim");

    //assert
    //do some assertion
}

拋出的錯誤是它無法將類型EnumerableQuery轉換為mockContext.Returns語句中的DbSet。

這與接口的外觀類似。

PersonRepository.cs

public class PersonRepository: EFRepository<Person>, IPersonRepository
{
    public PersonRepository(DbContext dbContext) : base(dbContext)
    {
    }

    public IQueryable<Link> GetByFirstName(string name)
    {
        return DbSet.Where(p => p.FirstName == name);
    }
}

IPersonRepository.cs

public interface IPersonRepository: IRepository<Person>
{
    IQueryable<Person> GetByFirstName(string name);
}

IRepository.cs

public interface IRepository<T> where T : class 
{
    IQueryable<T> GetAll();
    T GetById(int id);
    void Add(T entity);
    void Delete(T entity);
    void Delete(int id);
    void Update(T entity);
}

EFRepository.cs

public class EFRepository<T> : IRepository<T> where T : class
{
    protected DbContext DbContext { get; set; }
    public IDbSet<T> DbSet { get; set; }

    public EFRepository(DbContext dbContext)
    {
        if (dbContext == null)
            throw new ArgumentNullException("dbContext");

        DbContext = dbContext;
        DbSet = DbContext.Set<T>();
    }
    ...
}

Answer 1

您可以做的是將Linq表達式從存儲庫移動到業​​務邏輯中，然后模擬存儲庫。

public interface IPersonRepository : IRepository<Person>
{
    IQueryable<Person> GetAll { get; }
}

public class PersonRepository : EFRepository<Person>, IPersonRepository
{
    // ...

    public IQueryable<Person> GetAll
    {
        get { return DbSet; }
    }
}

public class SomeBusinessLogicClass
{
    private readonly IPersonRepository _people;

    public SomeBusinessLogicClass(IPersonRepository people)
    {
        _people = people;
    }

    public IEnumerable<Person> GetByFirstName(string name)
    {
        return _people.GetAll.Where(p => p.FirstName == name);
    }
}

現在重寫測試以驗證業務邏輯。

[Fact]
public void SomeTest() 
{
    //arrange
    var mockRepository = new Mock<IPersonRepository>();
    var mockData = new List<Person>
        {
            new Person { Name = "Jim", Age = 47 }
        };
    mockRepository.Setup(x => x.GetAll).Returns(mockData);

    var bl = new SomeBusinessLogicClass(mockRepository.Object); 

    //act
    var result = bl.GetByFirstName("Jim");

    //assert
    //do some assertion
}