将 Google Mock 与 boost::bind 一起使用
我有一个类，其构造函数采用 Boost 函数，我想用 Google Mock 测试它。以下代码显示了一个示例类以及我对其进行测试的尝试：
MyClass.h:
#include <boost/function.hpp>
class MyClass
{
public:
MyClass(boost::function<void()> callback);
void callCallback();
private:
boost::function<void()> m_callback;
};
MyClassTest.cpp:
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <boost/bind.hpp>
#include "MyClass.h"
class CallbackMock
{
public:
MOCK_METHOD0(callback, void());
};
TEST(MyClassShould, CallItsCallback)
{
CallbackMock callbackMock;
MyClass myClass(boost::bind(&CallbackMock::callback, callbackMock));
EXPECT_CALL(callbackMock, callback()).Times(1);
myClass.callCallback();
}
Attempting to compiling MyClassTest.cpp in Visual Studio 2008给出以下错误：
...gmock/gmock-generate-function-mockers.h(76) ：错误C2248： '测试::内部::FunctionMockerBase::FunctionMockerBase' : 无法访问私有成员 在课堂上声明 '测试::内部::FunctionMockerBase' 1>与 1> [ 1>
F＝void(空洞)1＞ ] 1>
.../gmock-spec-builders.h(1656) ：参见 声明 '测试::内部::FunctionMockerBase::FunctionMockerBase' 1>与 1> [ 1>
F＝void(空洞)1＞ ] 1>
该诊断发生在 编译器生成的函数 '测试::内部::FunctionMocker::FunctionMocker(const 测试::内部::FunctionMocker &)'1>与 1> [ 1>
函数＝void(void)1> ]
该错误源于包含 boost::bind 的行。用 void callback(){} 替换模拟方法可以消除编译错误（但也消除了 Google Mock 的使用，达不到目的）。我想要做的事情可以在不修改测试类的情况下实现吗？
I have a class whose constructor takes a Boost function, and I'd like to test it with Google Mock. The following code shows a sample class and my attempt to test it:
MyClass.h:
#include <boost/function.hpp>
class MyClass
{
public:
MyClass(boost::function<void()> callback);
void callCallback();
private:
boost::function<void()> m_callback;
};
MyClassTest.cpp:
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <boost/bind.hpp>
#include "MyClass.h"
class CallbackMock
{
public:
MOCK_METHOD0(callback, void());
};
TEST(MyClassShould, CallItsCallback)
{
CallbackMock callbackMock;
MyClass myClass(boost::bind(&CallbackMock::callback, callbackMock));
EXPECT_CALL(callbackMock, callback()).Times(1);
myClass.callCallback();
}
Attempting to compile MyClassTest.cpp in Visual Studio 2008 gives the following error:
...gmock/gmock-generated-function-mockers.h(76)
: error C2248:
'testing::internal::FunctionMockerBase::FunctionMockerBase'
: cannot access private member
declared in class
'testing::internal::FunctionMockerBase'
1> with 1> [ 1>
F=void (void) 1> ] 1>
.../gmock-spec-builders.h(1656) : see
declaration of
'testing::internal::FunctionMockerBase::FunctionMockerBase'
1> with 1> [ 1>
F=void (void) 1> ] 1>
This diagnostic occurred in the
compiler generated function
'testing::internal::FunctionMocker::FunctionMocker(const
testing::internal::FunctionMocker
&)' 1> with 1> [ 1>
Function=void (void) 1> ]
The error stems from the line containing boost::bind. Replacing the mocked method with void callback(){} eliminates the compile error (but also eliminates the use of Google Mock, defeating the purpose). Is what I'm trying to do possible without modifying the tested class?
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评论（2）
原因是 Google Mock 模拟不可复制——这是设计使然。当您尝试按值将其传递给
boost::bind时，编译器无法生成复制构造函数。您应该在将模拟的地址传递给bind时获取它：The reason is that Google Mock mocks are not copyable - that is by design. When you try to pass it into
boost::bindby value, the compiler fails to generate the copy constructor. You should take the mock's address when passing it intobind:我认为这一行是错误的：
MyClass myClass(boost::bind(&CallbackMock::callback, callbackMock));最后一个参数应该是
&callbackMockI think this line is wrong:
MyClass myClass(boost::bind(&CallbackMock::callback, callbackMock));The last parameter should be
&callbackMock