转换IQueryable< T>到DbSet< T> [英] Converting an IQueryable<T> to a DbSet<T>
问题描述
我不确定这是否可行,但是我试图对使用DbSet的存储库进行单元测试.我以为最简单的解决方案就是创建一个Enumerable,然后用它替换DbSet,这是我的尝试.
I'm not sure that this is possible, but I'm trying to unit test a repository that uses a DbSet. I thought the easiest solution would just be to make an Enumerable, and replace the DbSet with that, this is my attempt.
我正在使用C#,EntityFramework,XUnit和Moq
I'm using C#, EntityFramework, XUnit, and 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
}
引发的错误是它无法将EnumerableQuery类型转换为模拟上下文.返回语句上的DbSet.
The error that gets thrown is it can't convert type EnumerableQuery to a DbSet on the mockContext.Returns statement.
这与界面的外观相似.
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>();
}
...
}
推荐答案
您可以做的是将Linq表达式从存储库移到业务逻辑中,然后模拟存储库.
What you can do is to move the Linq expression from your repository into the business logic and mock the repository instead.
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);
}
}
现在重写测试以验证业务逻辑.
Now rewrite your test to validate the business logic.
[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
}
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