Google Mock Destructor

Question

I'm trying to become familiar with Google's mocking framework so I can more easily apply some TDD to my C++ development. I have the following interface:

#include <string>

class Symbol {
public:
    Symbol (std::string name, unsigned long address) {}
    virtual ~Symbol() {}
    virtual std::string getName() const = 0;
    virtual unsigned long getAddress() const = 0;
    virtual void setAddress(unsigned long address) = 0;
};

I want to verify that the destructor is called when an instance is deleted. So I have the following MockSymbol class:

#include "gmock/gmock.h"
#include "symbol.h"

class MockSymbol : public Symbol {
    public:
        MockSymbol(std::string name, unsigned long address = 0) :
            Symbol(name, address) {}
        MOCK_CONST_METHOD0(getName, std::string());
        MOCK_CONST_METHOD0(getAddress, unsigned long());
        MOCK_METHOD1(setAddress, void(unsigned long address));
        MOCK_METHOD0(Die, void());
        virtual ~MockSymbol() { Die(); }
};

Note: I've omitted the include guards in the above but they are in my header files.

I haven't been able to get to a point where I'm actually testing anything yet. I have the following:

#include "gmock/gmock.h"
#include "MockSymbol.h"

TEST(SymbolTableTests, DestructorDeletesAllSymbols) {
    ::testing::FLAGS_gmock_verbose = "info";
    MockSymbol *mockSymbol = new MockSymbol("mockSymbol");
    EXPECT_CALL(*mockSymbol, Die());
}

When I execute my test runner, my other tests execute and pass as I expect them to. However, when the above test executes I get the following error:

SymbolTableTests.cpp:11: EXPECT_CALL(*mockSymbol, Die()) invoked Segmentation fault (core dumped)

I've spent the last few hours searching Google and trying different things, but to know avail. Does anyone have any suggestions?

Astrophotography

There's no (Default) action specified for Die() or any of the other mocked methods ... – Horn

According to the documentation, I shouldn't need to specify a default action, since all of my methods use one of the primitive types. Am I missing something? – Astrophotography

I'm running Cygwin on Windows 7. After some digging, I found that setting gtest_disable_pthreads to ON in my build config solves the problem. – Astrophotography

Google: "Hey, destructor, your mother wears combat boots!" Destructor: "sob". – Sava

maybe your mockSymbol object was not created properly? You can add EXPECT_TRUE(mockSymbol != NULL) to check – Cheju

@user1743952 If you have solved this problem, you should post the answer as an answer, not a comment. – Goy

@Kazark I couldn't do that when I originally posted the question due to new account restrictions. – Astrophotography

It is probably not the cause of the crash, but you should add a call to delete MockSymbol. Otherwise, your destructor will never be called. – Amatol

Answer 1

I found that setting gtest_disable_pthreads to ON in my build config solves the problem.

Astrophotography