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POConverting an IQueryable<T> to a DbSet<T>
 

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  1. POConverting an IQueryable<T> to a DbSet<T>
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    <p>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.</p> <p>I'm using C#, EntityFramework, XUnit, and Moq</p> <pre><code>[Fact] public void SomeTest() { //arrange var mockContext = new Mock&lt;MyDbContext&gt;(); var mockData = new List&lt;Person&gt; { new Person { Name = "Jim", Age = 47 } }; mockContext.Setup(db =&gt; db.Persons).Returns((DbSet&lt;Person&gt;)mockData.AsQueryable()); var repo = PersonRepository(mockContext.Object); //act var result = repo.GetByFirstName("Jim"); //assert //do some assertion } </code></pre> <p>The error that gets thrown is it can't convert type EnumerableQuery to a DbSet on the mockContext.Returns statement.</p> <p>Here is something similar to what the interfaces look like.</p> <p><strong>PersonRepository.cs</strong></p> <pre><code>public class PersonRepository: EFRepository&lt;Person&gt;, IPersonRepository { public PersonRepository(DbContext dbContext) : base(dbContext) { } public IQueryable&lt;Link&gt; GetByFirstName(string name) { return DbSet.Where(p =&gt; p.FirstName == name); } } </code></pre> <p><strong>IPersonRepository.cs</strong></p> <pre><code>public interface IPersonRepository: IRepository&lt;Person&gt; { IQueryable&lt;Person&gt; GetByFirstName(string name); } </code></pre> <p><strong>IRepository.cs</strong></p> <pre><code>public interface IRepository&lt;T&gt; where T : class { IQueryable&lt;T&gt; GetAll(); T GetById(int id); void Add(T entity); void Delete(T entity); void Delete(int id); void Update(T entity); } </code></pre> <p><strong>EFRepository.cs</strong></p> <pre><code>public class EFRepository&lt;T&gt; : IRepository&lt;T&gt; where T : class { protected DbContext DbContext { get; set; } public IDbSet&lt;T&gt; DbSet { get; set; } public EFRepository(DbContext dbContext) { if (dbContext == null) throw new ArgumentNullException("dbContext"); DbContext = dbContext; DbSet = DbContext.Set&lt;T&gt;(); } ... } </code></pre>
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    1. PO
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    1. USKyle Gobel
    1. USKyle Gobel
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    1. VO
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      1. POConverting an IQueryable<T> to a DbSet<T>
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      1. VTUpMod
    2. VO
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      1. POConverting an IQueryable<T> to a DbSet<T>
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      1. VTUpMod
    1. COIf you have a look at the definition of DbSet<TEntity> you will see that it inherits from IEnumerable<TEntity>, so you may need to do the abstraction at the interface (IEnumerable<Entity>) level.
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      1. POConverting an IQueryable<T> to a DbSet<T>
      1. USacarlon
    2. COIt also inherits from IQueryable and IEnumerable.
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      1. POConverting an IQueryable<T> to a DbSet<T>
      1. USacarlon
 

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