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[英]How to Mock A Method(non-virtual) To Return Particular Value Using GMock in C++?
[英]Mock non-virtual method C++ (gmock)
我有課
class CSumWnd : public CBaseWnd
{
private:
bool MethodA()
}
請你能幫助如何模擬MethodA()
而不做虛擬,我不明白hi-perf依賴注入的概念
這意味着您必須模擬生產代碼。 使用你的例子:
CSumWind
類定義:
class CSumWnd : public CBaseWnd
{
private:
bool MethodA()
};
模擬CSumWnd
類定義:
class MockCSumWnd : public CBaseWnd
{
private:
MOCK_METHOD(MethodA, bool());
};
生產類必須使用CSumWind
類CSumWind
進行測試。 現在,在測試中提供在生產代碼和MockCSumWnd
類中使用CSumWind
類的模板。
template <class CSumWndClass>
class TestedClass {
//...
void useSumWnd(const CSumWndClass &a);
private:
CSumWndClass sumWnd;
};
在生產中實例化TestedClass
:
TestedClass <CSumWnd> obj;
測試可執行文件中TestedClass
對象的實例化:
TestedClass <MockCSumWnd> testObj;
如果您不想更改現有代碼,這里是我正在開發的VC ++的特定解決方案( https://github.com/mazong1123/injectorpp )。 簡短的步驟是:
我們把關鍵代碼放在這里。
檢索方法的符號和類的地址。 以下是實施的關鍵思路。 完整的源代碼可以在https://github.com/mazong1123/injectorpp/blob/master/injectorpp/ClassResolver.cpp上找到。
// Retrieve class symbol. if (SymGetTypeFromName(this->m_hProcess, modBase, className.c_str(), classSymbol) == FALSE) { throw; } // Get children of class - which are methods. DWORD numChildren = 0; if (SymGetTypeInfo(this->m_hProcess, classSymbol->ModBase, classSymbol->TypeIndex, TI_GET_CHILDRENCOUNT, &numChildren) == FALSE) { throw; } // Get methods info. if (SymGetTypeInfo(this->m_hProcess, classSymbol->ModBase, classSymbol->TypeIndex, TI_FINDCHILDREN, methods) == FALSE) { throw; } // Retrieve all methods. for (DWORD i = 0; i < numChildren; ++i) { ULONG curChild = methods->ChildId[i]; // Resolve function. Function resolvedFunction; this->m_functionResolver->Resolve(classSymbol->ModBase, curChild, resolvedFunction); // Add the resolved function to the output. resolvedMethods.push_back(resolvedFunction); }
第2步很簡單。 它只是文本比較和處理。
如何注入magic asm來改變方法行為:(完整的源代碼可以在https://github.com/mazong1123/injectorpp/blob/master/injectorpp/BehaviorChanger.cpp上找到 )
// A magic function to change the function behavior at runtime // // funcAddress - The address of the function to be changed from. // expectedReturnValue - The return value should be changed to. void BehaviorChanger::ChangeFunctionReturnValue(ULONG64 funcAddress, int expectedReturnValue) { // The purpose of this method is to change the return value // to what ever int value we expected. // Therefore, we just need to inject below asm to the header of specific function: // // mov eax, expectedValue // ret // // Above asm code tells the function to return expectedValue immediately. // Now let's prepare the asm command. byte asmCommand[6]; // mov asmCommand[0] = 0xB8; // The value. asmCommand[1] = expectedReturnValue & 0xFF; asmCommand[2] = (expectedReturnValue >> 8) & 0xFF; asmCommand[3] = (expectedReturnValue >> 16) & 0xFF; asmCommand[4] = (expectedReturnValue >> 24) & 0xFF; // ret asmCommand[5] = 0xC3; WriteProcessMemory((HANDLE)-1, (void*)funcAddress, asmCommand, 6, 0); }
試試CppFreeMock和這里提到的其他一些。
例:
string func() {
return "Non mocked.";
}
TEST(HelloWorld, First) {
EXPECT_CALL(*MOCKER(func), MOCK_FUNCTION()).Times(Exactly(1))
.WillOnce(Return("Hello world."));
EXPECT_EQ("Hello world.", func());
}
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