在使用 googletest 进行模拟时，如何为重载方法指定 internal::AnythingMatcher 的参数类型？

Question

初始问题

在使用 googletest 进行测试时，我使用了一个模拟 class，其中包含一个重载方法，其中一个参数的类型不同。

当我这样做时，这会导致模棱两可的函数调用

EXPECT_CALL(mockedClass,mockedMethod(_,_)).WillOnce(Return(true));

我试图通过用 An<type>()、TypedEq<type>(_) 或 Matcher<type>(_) 替换有问题的参数以及写一些东西来将 internal::AnythingMatcher 下划线与类型规范结合起来喜欢：

Matcher<type> customAnythingMatcher = _;
EXPECT_CALL(mockedClass,mockedMethod(_,customAnythingMatcher)).WillOnce(Return(true));

一切都无济于事。任何提示如何消除该调用的歧义？

更新#1

根据要求，我通过提供一个最小的工作——或者在这种情况下是一个非工作——示例来详细说明我正在努力实现的目标：

myInterfaceToMock.h

#ifndef MYINTERFACETOMOCK_H
#define MYINTERFACETOMOCK_H

#include <QVariant>
#include <QtGlobal>
class MyInterfaceToMock {
  virtual bool myMethod(QVariant &firstArgument,
                        const quint8 secondArgument) const = 0;
  virtual bool myMethod(QByteArray &firstArgument,
                        const quint16 secondArgument) const = 0;
  virtual bool myOtherMethod(quint8 firstAndOnlyArgument) const = 0;
};

#endif  // MYINTERFACETOMOCK_H

myMock.h

#ifndef MYMOCK_H
#define MYMOCK_H

#include <gmock/gmock.h>

#include <QtCore/QObject>

#include "myInterfaceToMock.h"
class MyMock : public MyInterfaceToMock {
 public:
  // virtual bool myMethod(QVariant &firstArgument, const quint8 secondArgument)
  // const = 0;
  MOCK_METHOD(bool, myMethod, (QVariant &, const quint8), (const, override));
  // virtual bool myMethod(QByteArray &firstArgument, const quint16
  // secondArgument) const = 0;
  MOCK_METHOD(bool, myMethod, (QByteArray &, const quint16), (const, override));
  // virtual bool myOtherMethod(quint8 firstAndOnlyArgument) const = 0;
  MOCK_METHOD(bool, myOtherMethod, (quint8), (const, override));
};

#endif  // MYMOCK_H

main.cpp

#include <gmock/gmock-matchers.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <QCoreApplication>
#include <QTimer>

class Tester : public QObject {
  Q_OBJECT
 public:
  Tester(QObject *parent = nullptr) : QObject(parent) {}

 public slots:
  void run() {
    ::testing::InitGoogleTest();
    emit(result(RUN_ALL_TESTS()));
  }

 signals:
  void result(int res);
};

#include "main.moc"

int main(int argc, char *argv[]) {
  QCoreApplication app(argc, argv);

  ::testing::InitGoogleMock(&argc, argv);

  Tester *tester = new Tester(&app);

  QObject::connect(tester, &Tester::result, &app, &QCoreApplication::exit);

  QTimer::singleShot(0, tester, SLOT(run()));

  return app.exec();
}

#include "myMock.h"
TEST(myTest, testMockOverload) {
  using namespace testing;
  MyMock mock;
  // Reference method, which does work all the time
  EXPECT_CALL(mock, myOtherMethod(_)).WillRepeatedly(Return(false));
  // Using a defined value as argument
  QVariant myVariant;
  EXPECT_CALL(mock, myMethod(myVariant, 3)).WillOnce(Return(true));
  bool result = mock.myMethod(myVariant, 3);
  ASSERT_TRUE(result);
  // Anything matcher for the unambiguous argument
  EXPECT_CALL(mock, myMethod(myVariant, _)).WillOnce(Return(true));
  result = mock.myMethod(myVariant, 3);
  ASSERT_TRUE(result);
  // Trying to match any passed qvariant
  EXPECT_CALL(mock, myMethod(An<QVariant>(), _)).WillOnce(Return(true));
}

最后一行发出编译器错误：

..\googlemock_disambiguate\main.cpp(55): error C2664: 'testing::internal::MockSpec<bool (QByteArray &,quint16)> MyMock::gmock_myMethod(const testing::internal::WithoutMatchers &,const testing::internal::Function<bool (QByteArray &,quint16)> *) const': cannot convert argument 1 from 'testing::Matcher<QVariant>' to 'const testing::Matcher<QVariant &> &'
..\googlemock_disambiguate\main.cpp(55): note: Reason: cannot convert from 'testing::Matcher<QVariant>' to 'const testing::Matcher<QVariant &>'
..\googlemock_disambiguate\main.cpp(55): note: No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

我猜它可能有某事。与方法的常量性有关，但我仍然不明白该错误的含义...

Answer 1

使用 An<type> 是正确的解决方案。

EXPECT_CALL(mockedClass,mockedMethod(_, An<type>())).WillOnce(Return(true));

如果它对您不起作用，则问题出在其他地方。也许你可以详细说明一下？

Answer 2

自己回答问题：

我只是没有正确指定类型，因为我希望通过引用。我总是尝试使用 An<type>() 之类的东西，而我应该使用 An<type&>() 来代替。

所以，根据我上面的例子，正确的行是：

EXPECT_CALL(mock, myMethod(An<QVariant&>(), _)).WillOnce(Return(true));

在使用 googletest 进行模拟时，如何为重载方法指定 internal::AnythingMatcher 的参数类型？

While mocking with googletest, how to specify the argument type of an internal::AnythingMatcher for overloaded methods?

c++

mocking

googletest

overload-resolution

googlemock

初始问题

更新#1

myInterfaceToMock.h

myMock.h

main.cpp