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POTrying to Mock a data Service which returns a IDataReader
 

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    <p>I'm trying to mock (using Rhino.Mocks) a DataService which returns an IDataReader. I Can mock the IDataReader (<a href="https://stackoverflow.com/questions/1792984/mocking-a-datareader-and-getting-a-rhino-mocks-exceptions-expectationviolationex">StackOverFlow Q 1792984</a>) but if I then Stub out A Data Service which returns this DataReader and inject it into the method I am trying to test it the stub returns only a null Data Reader.</p> <p>IDataService</p> <pre><code>public interface IDataService { SqlDataReader ExecuteReader(string cmdText, CommandType commandType); &lt;rest of definition ommited } </code></pre> <p>Unit test</p> <pre><code> [TestMethod] public void GetCustomer_Pass() { //Arrange var customer = new Customer() { Id = 1, FirstName = "Patrick", LastName = "Hastings", ProfilePictureURL = "" }; var mockDataService = MockRepository.GenerateStub&lt;IDataService&gt;(); var reader = MockRepository.GenerateStub&lt;IDataReader&gt;(); reader.Stub(x =&gt; x.Read()).Repeat.Once().Return(true); reader.Stub(x =&gt; x.Read()).Return(false); reader.Stub(x =&gt; x["Id"]).Return(customer.Id); reader.Stub(x =&gt; x["FirstName"]).Return(customer.FirstName); reader.Stub(x =&gt; x["LastName"]).Return(customer.LastName); reader.Stub(x =&gt; x["ProfilePictureURL"]).Return(customer.ProfilePictureURL); mockDataService.Stub( s =&gt; s.ExecuteReader(string.Format("select FirstName, LastName,ProfilePictureURL from customer where Id = {0}", customer.Id), CommandType.Text)) .Return(reader as SqlDataReader); var custRepository = new CustomerRepository(mockDataService); //Act var customer2 = custRepository.GetCustomer(1); //Assert Assert.AreEqual(customer.FirstName, customer2.FirstName,"FirstName Mismatch"); Assert.AreEqual(customer.LastName, customer2.LastName, "LastName Mismatch"); } </code></pre> <p>Method UnderTest</p> <pre><code> public CustomerRepository(IDataService dataService) //Constructor { if (dataService == null) throw new ArgumentNullException("dataService", "dataService cannot be null."); this.dataService = dataService; } public Customer GetCustomer(int id) { var sql =string.Format("select FirstName, LastName, ProfilePictureURL from customer where Id = {0}",id); var dr = dataService.ExecuteReader(sql, CommandType.Text); Customer customer ; using (dr) { if (!dr.Read()){return null;} customer = new Customer { FirstName = dr["FirstName"].ToString(), LastName = dr["LastName"].ToString(), ProfilePictureURL = dr["ProfilePictureURL"].ToString() }; } return customer; } </code></pre> <p>This issue that I get is that when "dataService.ExecuteReader(sql, CommandType.Text);" should return the mocked IDataReader but instead returns Null - any pointers as to what I am doing wrong would be gratefully appreciated.</p>
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