public void Retrieve_NoParameters_ReturnsIDataReader()
{
_command.Setup(x => x.ExecuteReader()).Returns(new Mock <IDataReader>().Object);
var commandText = "test";
var result = _data.Retrieve(commandText);
Assert.IsAssignableFrom <IDataReader>(result);
_command.VerifySet(x => x.CommandText = commandText, Times.Once());
_command.VerifySet(x => x.CommandType = CommandType.StoredProcedure, Times.Never());
_command.Verify(x => x.CreateParameter(), Times.Never());
_command.Verify(x => x.Parameters.Add(It.IsAny <IDbDataParameter>()), Times.Never());
_connection.Verify(x => x.Open(), Times.Once());
_command.Verify(x => x.ExecuteReader(), Times.Once());
}