HippoMocks - 在C++中模拟COM接口？

Question

The latest version of Hippo Mocks（在它的Git仓库中）看起来增加了对COM接口的支持。我试着嘲笑一个ADO连接对象;其中采取了一些调整Hippo Mocks来正确构建（似乎COM版本的代码没有更新其他Hippo Mocks中的更改）。我现在建立，但下面的测试失败：

MockRepository mocks; 
auto pConn = mocks.Mock<ADONS::_Connection>(); 
mocks.OnCall(pConn, ADONS::_Connection::AddRef).Return(1); 

ADONS::_ConnectionPtr conn = pConn; 

智能指针做的第一件事是AddRef接口。我的模拟不应该在意引用计数，所以我添加了一个简单返回1的调用期望值。但是，只要AddRef被调用，就会抛出HippoMocks::NotImplementedException。

有没有人成功地用Hippo Mocks嘲笑COM接口？

Answer 1

我有同样的问题，并解决它。 hippomocks的实际版本现已发布在GitHub上：

https://github.com/dascandy/hippomocks

的提供的链接，这有助于找到一个固定的想法伟大的赞赏。

UPDATE，有关我的实施和添加的COM支持的详细信息。

首先，我做这工作，这下面的测试表明

class ICom 
{ 
public: 
    virtual ~ICom() {} 
    virtual long __stdcall A(void) = 0; 
    virtual long __stdcall B(int) = 0; 
    virtual long __stdcall C(int, int) = 0; 
    ... 
}; 


TEST(checkStdCallBase) 
{ 
    MockRepository mocks; 

    ICom* ic = mocks.Mock<ICom>(); 
    mocks.ExpectCall(ic, ICom::A) 
     .Return(1); 

    long actual = ic->A(); 
    EQUALS(1, actual); 
} 

为了使其工作，我不得不修补在hippomocks.h几个地方，最重要的virtual_function_index方法。该更正确保了接口上的呼叫的正确地址计算。

其次，我为COM对象添加了一些常用设置助手，为AddRef，Release和QueryInterface提供了标准的行为。

试验表明如何使用它：在一个单独的头“comsupport.h”提供

MIDL_INTERFACE("4745C05E-23E6-4c6d-B9F2-E483359A8B89") 
COMInterface1 : public IUnknown 
{ 
public: 
    virtual HRESULT STDMETHODCALLTYPE getTObjectCount( 
     /* [out] */ unsigned long *pCount) = 0; 
}; 

typedef GUID ESTypeID; 

MIDL_INTERFACE("356D44D9-980A-4149-A586-C5CB8B191437") 
COMInterface2 : public IUnknown 
{ 
public: 
    virtual HRESULT STDMETHODCALLTYPE getMappablePackages( 
     /* [out] */ long *pSize, 
     /* [size_is][size_is][out] */ ESTypeID **pIdList) = 0; 
}; 

     TEST(CheckThat_AddCommExpectations_Stubs_QueryInterface_AddRef_Release) 
{ 
    MockRepository mocks; 
    COMInterface1* deviceMock = mocks.Mock<COMInterface1>(); 

    AddComExpectations(mocks, deviceMock); 

    { 
     CComPtr<IUnknown> pUnk = deviceMock; 
     CComQIPtr<COMInterface1> pDevice = pUnk; 

     CHECK(pDevice == pUnk); 

     IUnknown* p = NULL; 
     pDevice->QueryInterface(__uuidof(IUnknown), (void**)&p); 

     CHECK(p == deviceMock); 
    } 
} 

TEST(CheckThat_ConnectComInterfaces_Stubs_QueryInterface_ToEachOther) 
{ 
    MockRepository mocks; 
    COMInterface1* deviceMock = mocks.Mock<COMInterface1>(); 
    COMInterface2* devMappingMock = mocks.Mock<COMInterface2>(); 

    ConnectComInterfaces(mocks, deviceMock, devMappingMock); 

    { 
     //Com objects can reach each other 
     CComQIPtr<COMInterface2> pDevMapping = deviceMock; 

     CHECK(pDevMapping != NULL); 
     CHECK(pDevMapping == devMappingMock); 

     CComQIPtr<COMInterface1> pDevNavigate = devMappingMock; 

     CHECK(pDevNavigate != NULL); 
     CHECK(pDevNavigate == deviceMock); 
    } 

} 

的辅助方法AddComExpectations和ConnectComInterfaces。标题是Hippomocks的附加组件：

template <typename T> 
void AddComExpectations(HM_NS MockRepository& mocks, T* m) 
{ 
    mocks.OnCall(m, T::AddRef) 
     .Return(1); 
    mocks.OnCall(m, T::Release) 
     .Return(1); 
    mocks.OnCall(m, T::QueryInterface) 
     .With(__uuidof(T), Out((void**)m)) 
     .Return(S_OK); 

    mocks.OnCall(m, T::QueryInterface) 
     .With(__uuidof(IUnknown), Out((void**)m)) 
     .Return(S_OK); 

} 

template <typename T1, typename T2> 
void ConnectComInterfaces(HM_NS MockRepository& mocks, T1* m1, T2* m2) 
{ 
    //from T1 to T2 
    mocks.OnCall(m1, T1::QueryInterface) 
     .With(__uuidof(T2), Out((void**)m2)) 
     .Return(S_OK); 
    //from T2 to T1 
    mocks.OnCall(m2, T2::QueryInterface) 
     .With(__uuidof(T1), Out((void**)m1)) 
     .Return(S_OK); 

    AddComExpectations(mocks, m1); 
    AddComExpectations(mocks, m2); 

    //no support for interface hierarchies 
    //no Base IUnknown -> do it yourself if you really need that special case 
}