title: Mocking DbSet.toList
body: <p>I want to mock the method <code>DbSet.toList</code> but I get always a exception because the <code>toList</code> method is declared in <code>IEnumerable</code>. </p>
  
  <p>Test method SocialSWT.Tests.Repository.RepositoryTest.GetCallsListOfEntities threw exception: 
  System.NotSupportedException: Expression references a method that does not belong to the mocked object: foo => foo.ToList()</p>
  
  <p><code>dbSet.Setup(foo =&gt; foo.ToList()).Returns(mockList);</code></p>