EXPECT_DEATH with GMock - failed to die - c++

Question

I have created a mock of an external socket api in my_inet.cpp file.
GMock functions for that socket api is in mock.h file.
I am using my created socket api of my_inet in server.cpp file.
The test is written in gtest.cpp.
I want to execute a death case successfully through exit(1) but GMock says that "failed to die".
Why?
gtest.cpp
TEST(MyTest, SocketConnectionFail)
{
MockMyTCPAPI obj_myTCP;
Server obj_server( &obj_myTCP );
EXPECT_DEATH( obj_server.InitializeSocket(), "No socket connection!");
}
server.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;
}
Output:
[==========] 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

The output explains the issue:
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: socket(1, 0, 0)
Returns: 0
Which means myTCPAPI->socket(PF_INET, SOCK_STREAM, 0) returns 0, not -1.
Since MockMyTCPAPI obj_myTCP is a mock object (not MyTCPAPI), it won't run MyTCPAPI::socket(). You need to specify its return value. Something like the following should help:
EXPECT_CALL(obj_myTCP, socket(_, _, _))
.WillRepeatedly(Return(-1));
Or use MyTCPAPI instead of MockMyTCPAPI in your test.