模擬DataReader並獲取Rhino.Mocks.Exceptions.ExpectationViolationException：IDisposable.Dispose（）;預計＃0，實際＃1

Question

我試圖嘲弄一個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(); 

，但我不斷收到一個Rhino.Mocks.Exceptions.ExpectationViolationException：IDisposable.Dispose（）;預期＃0，我方法中的實際＃1錯誤

 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); 
       }      
      }    
     } 

我錯過了什麼？

Answer 1

我會使用AAA的語法和使用接口（IDataReader），而不是具體類型（SqlDataReader）建議你測試的改寫：

// 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); 
...