c# - 模拟 DataReader 并获取 Rhino.Mocks.Exceptions.ExpectationViolationException : IDisposable. Dispose();预期#0，实际#1

Question

我正在尝试模拟一个 SqlDataReader

 SqlDataReader reader = mocks.CreateMock<SqlDataReader>();
 Expect.Call(reader.Read()).Return(true).Repeat.Times(1);
 Expect.Call(reader.Read()).Return(false);
 Expect.Call(reader.HasRows).Return(true);
 Expect.Call(reader.Dispose);
 Expect.Call(reader["City"]).Return("Boise");
 Expect.Call(reader["State"]).Return("State");
 Expect.Call(reader["LAT"]).Return(100);
 Expect.Call(reader["LON"]).Return(-100);
 mocks.ReplayAll();

但我不断收到 Rhino.Mocks.Exceptions.ExpectationViolationException: IDisposable.Dispose();我的方法中预期错误 #0，实际错误 #1

        using (reader)
        {
            if (reader.HasRows)
            {
                while (reader.Read())
                {
                    CityState myCity = new CityState
                       {
                           City = reader["City"].ToString(),
                           State = reader["State"].ToString(),
                           Lat = Convert.ToInt32(reader["LAT"]),
                           Lon = Convert.ToInt32(reader["LON"])
                       };
                    myCities.Add(myCity);
                }                    
            }               
        }

我错过了什么吗？

Answer 1

我建议您使用 AAA 语法重写测试并使用接口(interface) (IDataReader) 而不是具体类型 (SqlDataReader):

// Arrange
IDataReader reader = MockRepository.GenerateStub<IDataReader>();
reader.Stub(x => x.Read()).Repeat.Once().Return(true);
reader.Stub(x => x.Read()).Return(false);
reader.Stub(x => x["City"]).Return("Boise");
reader.Stub(x => x["State"]).Return("State");
reader.Stub(x => x["LAT"]).Return(100);
reader.Stub(x => x["LON"]).Return(-100);

// Act
var myCities = new List<CityState>();
using (reader)
{
    while (reader.Read())
    {
        CityState myCity = new CityState
        {
            City = reader["City"].ToString(),
            State = reader["State"].ToString(),
            Lat = Convert.ToInt32(reader["LAT"]),
            Lon = Convert.ToInt32(reader["LON"])
        };
        myCities.Add(myCity);
    }
}

// Assert
Assert.AreEqual(1, myCities.Count);
Assert.AreEqual("Boise", myCities[0].City);
...