使用 GMock 的 EXPECT_DEATH - 失败

Question

1. 我在 my_inet.cpp 文件中创建了一个外部套接字 API 的模拟。
2. 该套接字 api 的 GMock 函数位于 mock.h 文件中。
3. 我在server.cpp 文件中使用我创建的my_inet 套接字API。
4. 测试写在gtest.cpp。

我想通过exit(1) 成功执行一个死亡案例，但 GMock 说“死亡失败”。

为什么？

gtest.cpp

TEST(MyTest, SocketConnectionFail)
{
    MockMyTCPAPI obj_myTCP;

    Server obj_server( &obj_myTCP );

    EXPECT_DEATH( obj_server.InitializeSocket(), "No socket connection!");
}

服务器.cpp

int Server::InitializeSocket()
{
  if( ret_val_socket == -1 )
  {
        ret_val_socket = myTCPAPI->socket( PF_INET, SOCK_STREAM, 0 );

        if( ret_val_socket == -1 )
        {
            printf( "\nNo socket connection!" );
            exit(1);
        }
        return ret_val_socket;
  }
  else
  {
        printf( "Warning! Attempting to create socket again. %d" , ret_val_socket);
        return 2;
  }

  return 0;
}

my_inet.cpp

int MyTCPAPI::socket( int arg1, int arg2, int arg3 )
{
        return -1;
}

输出：

[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from MyTest
[ RUN      ] MyTest.SocketConnectionFail

[WARNING] /usr/src/gtest/src/gtest-death-test.cc:825:: Death tests use fork(), which is unsafe particularly in a threaded context. For this test, Google Test couldn't detect the number of threads.

GMOCK WARNING:
Uninteresting mock function call - returning default value.
    Function call: socket(1, 0, 0)
          Returns: 0
Stack trace:
/home/anisha/Documents/office/tdd/tcp/server/gtest.cpp:56: Failure
Death test: obj_server.InitializeSocket()
    Result: failed to die.
 Error msg:
[  DEATH   ] 
[  FAILED  ] MyTest.SocketConnectionFail (3 ms)
[----------] 1 test from MyTest (3 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (3 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] MyTest.SocketConnectionFail

 1 FAILED TEST

Answer 1

输出解释了问题：

GMOCK WARNING:
Uninteresting mock function call - returning default value.
    Function call: socket(1, 0, 0)
          Returns: 0

这意味着myTCPAPI->socket(PF_INET, SOCK_STREAM, 0) 返回 0，而不是 -1。

由于MockMyTCPAPI obj_myTCP 是一个模拟对象（不是MyTCPAPI），它不会运行MyTCPAPI::socket()。您需要指定其返回值。类似以下的内容应该会有所帮助：

EXPECT_CALL(obj_myTCP, socket(_, _, _))
  .WillRepeatedly(Return(-1));

或者在您的测试中使用MyTCPAPI 而不是MockMyTCPAPI。