C++ 구문 및 디자인 패턴에 대한 단위 테스트 모범 사례

class Singleton {
private:
    static Singleton* instance;
    Singleton() {}
public:
    static Singleton* getInstance() {
        if (instance == nullptr) {
            instance = new Singleton();
        }
        return instance;
    }
};

#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_CASE(Singleton_Creation) {
    Singleton* instance1 = Singleton::getInstance();
    BOOST_TEST(instance1 != nullptr);
    Singleton* instance2 = Singleton::getInstance();
    BOOST_TEST(instance1 == instance2);
}

#include <gmock/gmock.h>

class MockSingleton : public Singleton {
public:
    MOCK_METHOD0(getInstance, static Singleton*());
};

TEST(Singleton_Test, IntentionalTest) {
    MockSingleton mockSingleton;
    EXPECT_CALL(mockSingleton, getInstance())
        .Times(1)
        .WillOnce(::testing::Return(new MockSingleton));
    Singleton* instance = Singleton::getInstance();
    EXPECT_TRUE(instance != nullptr);  // 测试单例是否创建
    EXPECT_TRUE(dynamic_cast<MockSingleton*>(instance) != nullptr);  // 测试是否为 MockSingleton 对象
}