使用谷歌模擬無效的指針錯誤

Question

我正在使用谷歌Mock框架來執行串口管理器類的單元測試。我使用的類圖

一個我爲了測試串口管理準備測試的是：

TEST(SerialPortManagerTest,AllPortsAreClosedAtInit){ 

MockSerialPort port1; 
EXPECT_CALL(port1, IsOpen()).Times(Exactly(1)).WillOnce(Return(false)); 

MockSerialPort port2; 
EXPECT_CALL(port2, IsOpen()).Times(Exactly(1)).WillOnce(Return(false)); 

MockSerialPort port3; 
EXPECT_CALL(port3, IsOpen()).Times(Exactly(1)).WillOnce(Return(false)); 

SerialPortInterface* port1Ptr=&port1; 
SerialPortInterface* port2Ptr=&port2; 
SerialPortInterface* port3Ptr=&port3; 

MockSerialPortFactory portFactory; 
EXPECT_CALL(portFactory, CreateSerialPort(_)).Times(3). 
     WillOnce(ReturnPointee(&port1Ptr)). 
     WillOnce(ReturnPointee(&port2Ptr)). 
     WillOnce(ReturnPointee(&port3Ptr)); 

SerialPortFactoryInterface* portFactoryPtr=&portFactory; 

SerialPortManager* serialPortManager =new SerialPortManager(portFactoryPtr); 

EXPECT_FALSE(serialPortManager->GetPort(COM1)->IsOpen()); 
EXPECT_FALSE(serialPortManager->GetPort(COM2)->IsOpen()); 
EXPECT_FALSE(serialPortManager->GetPort(COM3)->IsOpen()); 
} 

當我執行的測試返回無效指針錯誤：

free(): invalid pointer: 0xbfc8d8e4 *** 

看問題，我發現，如果我評論說，刪除serialPortFactory在SerialPortManag線路沒有返回錯誤呃破壞者。

SerialPortManager::~SerialPortManager() { 
    for (int i = 0; i < PORT_COUNT; i++) { 
     delete ports[i]; 
    } 
    //delete serialPortFactory; 
} 

¿我該如何模擬serialPortFactory而不會收到此無效指針錯誤？

Answer 1

由於在測試中串行端口被刪除兩次，所以發生錯誤。第一次發生在MockSerialPort超出您的測試範圍。第二次發生在SerialPortManager的析構函數內部。如果您的意圖是讓SerialPortManager刪除串口，那麼您必須在您的測試中聲明堆上的串口：

TEST(SerialPortManagerTest,AllPortsAreClosedAtInit){ 

MockSerialPort* port1 = new MockSerialPort; 
EXPECT_CALL(*port1, IsOpen()).Times(Exactly(1)).WillOnce(Return(false)); 

// Same for the other two serial ports. 

MockSerialPortFactory portFactory; 
EXPECT_CALL(portFactory, CreateSerialPort(_)).Times(3). 
     WillOnce(Return(port1)). 
     WillOnce(Return(port2)). 
     WillOnce(Return(port3)); 

// Same as before 
}