// Copyright 2007, Google Inc.

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

//     * Neither the name of Google Inc. nor the names of its

// contributors may be used to endorse or promote products derived from

// this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Author: wan@google.com (Zhanyong Wan)

// Google Mock - a framework for writing C++ mock classes.

//

// This file tests the function mocker classes.

#include "gmock/gmock-generated-function-mockers.h"

#if GTEST_OS_WINDOWS

// MSDN says the header file to be included for STDMETHOD is BaseTyps.h but

// we are getting compiler errors if we use basetyps.h, hence including

// objbase.h for definition of STDMETHOD.

# include <objbase.h>

#endif  // GTEST_OS_WINDOWS

#include <map>

#include <string>

#include "gmock/gmock.h"

#include "gtest/gtest.h"

// There is a bug in MSVC (fixed in VS 2008) that prevents creating a

// mock for a function with const arguments, so we don't test such

// cases for MSVC versions older than 2008.

#if !GTEST_OS_WINDOWS || (_MSC_VER >= 1500)

# define GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

#endif  // !GTEST_OS_WINDOWS || (_MSC_VER >= 1500)

namespace testing {

namespace gmock_generated_function_mockers_test {

using testing::internal::string;

using testing::_;

using testing::A;

using testing::An;

using testing::AnyNumber;

using testing::Const;

using testing::DoDefault;

using testing::Eq;

using testing::Lt;

using testing::MockFunction;

using testing::Ref;

using testing::Return;

using testing::ReturnRef;

using testing::TypedEq;

class FooInterface {

 public:

  virtual ~FooInterface() {}

  virtual void VoidReturning(int x) = 0;

  virtual int Nullary() = 0;

  virtual bool Unary(int x) = 0;

  virtual long Binary(short x, int y) = 0;  // NOLINT

  virtual int Decimal(bool b, char c, short d, int e, long f,  // NOLINT

                      float g, double h, unsigned i, char* j, const string& k)

      = 0;

  virtual bool TakesNonConstReference(int& n) = 0;  // NOLINT

  virtual string TakesConstReference(const int& n) = 0;

#ifdef GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

  virtual bool TakesConst(const int x) = 0;

#endif  // GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

  virtual int OverloadedOnArgumentNumber() = 0;

  virtual int OverloadedOnArgumentNumber(int n) = 0;

  virtual int OverloadedOnArgumentType(int n) = 0;

  virtual char OverloadedOnArgumentType(char c) = 0;

  virtual int OverloadedOnConstness() = 0;

  virtual char OverloadedOnConstness() const = 0;

  virtual int TypeWithHole(int (*func)()) = 0;

  virtual int TypeWithComma(const std::map<int, string>& a_map) = 0;

#if GTEST_OS_WINDOWS

  STDMETHOD_(int, CTNullary)() = 0;

  STDMETHOD_(bool, CTUnary)(int x) = 0;

  STDMETHOD_(int, CTDecimal)(bool b, char c, short d, int e, long f,  // NOLINT

      float g, double h, unsigned i, char* j, const string& k) = 0;

  STDMETHOD_(char, CTConst)(int x) const = 0;

#endif  // GTEST_OS_WINDOWS

};

// Const qualifiers on arguments were once (incorrectly) considered

// significant in determining whether two virtual functions had the same

// signature. This was fixed in Visual Studio 2008. However, the compiler

// still emits a warning that alerts about this change in behavior.

#ifdef _MSC_VER

# pragma warning(push)

# pragma warning(disable : 4373)

#endif

class MockFoo : public FooInterface {

 public:

  MockFoo() {}

  // Makes sure that a mock function parameter can be named.

  MOCK_METHOD1(VoidReturning, void(int n));  // NOLINT

  MOCK_METHOD0(Nullary, int());  // NOLINT

  // Makes sure that a mock function parameter can be unnamed.

  MOCK_METHOD1(Unary, bool(int));  // NOLINT

  MOCK_METHOD2(Binary, long(short, int));  // NOLINT

  MOCK_METHOD10(Decimal, int(bool, char, short, int, long, float,  // NOLINT

                             double, unsigned, char*, const string& str));

  MOCK_METHOD1(TakesNonConstReference, bool(int&);;  // NOLINT

  MOCK_METHOD1(TakesConstReference, string(const int&);;

#ifdef GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

  MOCK_METHOD1(TakesConst, bool(const int));  // NOLINT

#endif

  // Tests that the function return type can contain unprotected comma.

  MOCK_METHOD0(ReturnTypeWithComma, std::map<int, string>());

  MOCK_CONST_METHOD1(ReturnTypeWithComma,

                     std::map<int, string>(int));  // NOLINT

  MOCK_METHOD0(OverloadedOnArgumentNumber, int());  // NOLINT

  MOCK_METHOD1(OverloadedOnArgumentNumber, int(int));  // NOLINT

  MOCK_METHOD1(OverloadedOnArgumentType, int(int));  // NOLINT

  MOCK_METHOD1(OverloadedOnArgumentType, char(char));  // NOLINT

  MOCK_METHOD0(OverloadedOnConstness, int());  // NOLINT

  MOCK_CONST_METHOD0(OverloadedOnConstness, char());  // NOLINT

  MOCK_METHOD1(TypeWithHole, int(int (*)()));  // NOLINT

  MOCK_METHOD1(TypeWithComma, int(const std::map<int, string>&);;  // NOLINT

#if GTEST_OS_WINDOWS

  MOCK_METHOD0_WITH_CALLTYPE(STDMETHODCALLTYPE, CTNullary, int());

  MOCK_METHOD1_WITH_CALLTYPE(STDMETHODCALLTYPE, CTUnary, bool(int));

  MOCK_METHOD10_WITH_CALLTYPE(STDMETHODCALLTYPE, CTDecimal, int(bool b, char c,

      short d, int e, long f, float g, double h, unsigned i, char* j,

      const string& k));

  MOCK_CONST_METHOD1_WITH_CALLTYPE(STDMETHODCALLTYPE, CTConst, char(int));

  // Tests that the function return type can contain unprotected comma.

  MOCK_METHOD0_WITH_CALLTYPE(STDMETHODCALLTYPE, CTReturnTypeWithComma,

                             std::map<int, string>());

#endif  // GTEST_OS_WINDOWS

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockFoo);

};

#ifdef _MSC_VER

# pragma warning(pop)

#endif

class FunctionMockerTest : public testing::Test {

 protected:

  FunctionMockerTest() : foo_(&mock_foo_) {}

  FooInterface* const foo_;

  MockFoo mock_foo_;

};

// Tests mocking a void-returning function.

TEST_F(FunctionMockerTest, MocksVoidFunction) {

  EXPECT_CALL(mock_foo_, VoidReturning(Lt(100)));

  foo_->VoidReturning(0);

}

// Tests mocking a nullary function.

TEST_F(FunctionMockerTest, MocksNullaryFunction) {

  EXPECT_CALL(mock_foo_, Nullary())

      .WillOnce(DoDefault())

      .WillOnce(Return(1));

  EXPECT_EQ(0, foo_->Nullary());

  EXPECT_EQ(1, foo_->Nullary());

}

// Tests mocking a unary function.

TEST_F(FunctionMockerTest, MocksUnaryFunction) {

  EXPECT_CALL(mock_foo_, Unary(Eq(2)))

      .Times(2)

      .WillOnce(Return(true));

  EXPECT_TRUE(foo_->Unary(2));

  EXPECT_FALSE(foo_->Unary(2));

}

// Tests mocking a binary function.

TEST_F(FunctionMockerTest, MocksBinaryFunction) {

  EXPECT_CALL(mock_foo_, Binary(2, _))

      .WillOnce(Return(3));

  EXPECT_EQ(3, foo_->Binary(2, 1));

}

// Tests mocking a decimal function.

TEST_F(FunctionMockerTest, MocksDecimalFunction) {

  EXPECT_CALL(mock_foo_, Decimal(true, 'a', 0, 0, 1L, A<float>(),

                                 Lt(100), 5U, NULL, "hi"))

      .WillOnce(Return(5));

  EXPECT_EQ(5, foo_->Decimal(true, 'a', 0, 0, 1, 0, 0, 5, NULL, "hi"));

}

// Tests mocking a function that takes a non-const reference.

TEST_F(FunctionMockerTest, MocksFunctionWithNonConstReferenceArgument) {

  int a = 0;

  EXPECT_CALL(mock_foo_, TakesNonConstReference(Ref(a)))

      .WillOnce(Return(true));

  EXPECT_TRUE(foo_->TakesNonConstReference(a));

}

// Tests mocking a function that takes a const reference.

TEST_F(FunctionMockerTest, MocksFunctionWithConstReferenceArgument) {

  int a = 0;

  EXPECT_CALL(mock_foo_, TakesConstReference(Ref(a)))

      .WillOnce(Return("Hello"));

  EXPECT_EQ("Hello", foo_->TakesConstReference(a));

}

#ifdef GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

// Tests mocking a function that takes a const variable.

TEST_F(FunctionMockerTest, MocksFunctionWithConstArgument) {

  EXPECT_CALL(mock_foo_, TakesConst(Lt(10)))

      .WillOnce(DoDefault());

  EXPECT_FALSE(foo_->TakesConst(5));

}

#endif  // GMOCK_ALLOWS_CONST_PARAM_FUNCTIONS

// Tests mocking functions overloaded on the number of arguments.

TEST_F(FunctionMockerTest, MocksFunctionsOverloadedOnArgumentNumber) {

  EXPECT_CALL(mock_foo_, OverloadedOnArgumentNumber())

      .WillOnce(Return(1));

  EXPECT_CALL(mock_foo_, OverloadedOnArgumentNumber(_))

      .WillOnce(Return(2));

  EXPECT_EQ(2, foo_->OverloadedOnArgumentNumber(1));

  EXPECT_EQ(1, foo_->OverloadedOnArgumentNumber());

}

// Tests mocking functions overloaded on the types of argument.

TEST_F(FunctionMockerTest, MocksFunctionsOverloadedOnArgumentType) {

  EXPECT_CALL(mock_foo_, OverloadedOnArgumentType(An<int>()))

      .WillOnce(Return(1));

  EXPECT_CALL(mock_foo_, OverloadedOnArgumentType(TypedEq<char>('a')))

      .WillOnce(Return('b'));

  EXPECT_EQ(1, foo_->OverloadedOnArgumentType(0));

  EXPECT_EQ('b', foo_->OverloadedOnArgumentType('a'));

}

// Tests mocking functions overloaded on the const-ness of this object.

TEST_F(FunctionMockerTest, MocksFunctionsOverloadedOnConstnessOfThis) {

  EXPECT_CALL(mock_foo_, OverloadedOnConstness());

  EXPECT_CALL(Const(mock_foo_), OverloadedOnConstness())

      .WillOnce(Return('a'));

  EXPECT_EQ(0, foo_->OverloadedOnConstness());

  EXPECT_EQ('a', Const(*foo_).OverloadedOnConstness());

}

TEST_F(FunctionMockerTest, MocksReturnTypeWithComma) {

  const std::map<int, string> a_map;

  EXPECT_CALL(mock_foo_, ReturnTypeWithComma())

      .WillOnce(Return(a_map));

  EXPECT_CALL(mock_foo_, ReturnTypeWithComma(42))

      .WillOnce(Return(a_map));

  EXPECT_EQ(a_map, mock_foo_.ReturnTypeWithComma());

  EXPECT_EQ(a_map, mock_foo_.ReturnTypeWithComma(42));

}

#if GTEST_OS_WINDOWS

// Tests mocking a nullary function with calltype.

TEST_F(FunctionMockerTest, MocksNullaryFunctionWithCallType) {

  EXPECT_CALL(mock_foo_, CTNullary())

      .WillOnce(Return(-1))

      .WillOnce(Return(0));

  EXPECT_EQ(-1, foo_->CTNullary());

  EXPECT_EQ(0, foo_->CTNullary());

}

// Tests mocking a unary function with calltype.

TEST_F(FunctionMockerTest, MocksUnaryFunctionWithCallType) {

  EXPECT_CALL(mock_foo_, CTUnary(Eq(2)))

      .Times(2)

      .WillOnce(Return(true))

      .WillOnce(Return(false));

  EXPECT_TRUE(foo_->CTUnary(2));

  EXPECT_FALSE(foo_->CTUnary(2));

}

// Tests mocking a decimal function with calltype.

TEST_F(FunctionMockerTest, MocksDecimalFunctionWithCallType) {

  EXPECT_CALL(mock_foo_, CTDecimal(true, 'a', 0, 0, 1L, A<float>(),

                                   Lt(100), 5U, NULL, "hi"))

      .WillOnce(Return(10));

  EXPECT_EQ(10, foo_->CTDecimal(true, 'a', 0, 0, 1, 0, 0, 5, NULL, "hi"));

}

// Tests mocking functions overloaded on the const-ness of this object.

TEST_F(FunctionMockerTest, MocksFunctionsConstFunctionWithCallType) {

  EXPECT_CALL(Const(mock_foo_), CTConst(_))

      .WillOnce(Return('a'));

  EXPECT_EQ('a', Const(*foo_).CTConst(0));

}

TEST_F(FunctionMockerTest, MocksReturnTypeWithCommaAndCallType) {

  const std::map<int, string> a_map;

  EXPECT_CALL(mock_foo_, CTReturnTypeWithComma())

      .WillOnce(Return(a_map));

  EXPECT_EQ(a_map, mock_foo_.CTReturnTypeWithComma());

}

#endif  // GTEST_OS_WINDOWS

class MockB {

 public:

  MockB() {}

  MOCK_METHOD0(DoB, void());

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockB);

};

// Tests that functions with no EXPECT_CALL() ruls can be called any

// number of times.

TEST(ExpectCallTest, UnmentionedFunctionCanBeCalledAnyNumberOfTimes) {

  {

    MockB b;

  }

  {

    MockB b;

    b.DoB();

  }

  {

    MockB b;

    b.DoB();

    b.DoB();

  }

}

// Tests mocking template interfaces.

template <typename T>

class StackInterface {

 public:

  virtual ~StackInterface() {}

  // Template parameter appears in function parameter.

  virtual void Push(const T& value) = 0;

  virtual void Pop() = 0;

  virtual int GetSize() const = 0;

  // Template parameter appears in function return type.

  virtual const T& GetTop() const = 0;

};

template <typename T>

class MockStack : public StackInterface<T> {

 public:

  MockStack() {}

  MOCK_METHOD1_T(Push, void(const T& elem));

  MOCK_METHOD0_T(Pop, void());

  MOCK_CONST_METHOD0_T(GetSize, int());  // NOLINT

  MOCK_CONST_METHOD0_T(GetTop, const T&());

  // Tests that the function return type can contain unprotected comma.

  MOCK_METHOD0_T(ReturnTypeWithComma, std::map<int, int>());

  MOCK_CONST_METHOD1_T(ReturnTypeWithComma, std::map<int, int>(int));  // NOLINT

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockStack);

};

// Tests that template mock works.

TEST(TemplateMockTest, Works) {

  MockStack<int> mock;

  EXPECT_CALL(mock, GetSize())

      .WillOnce(Return(0))

      .WillOnce(Return(1))

      .WillOnce(Return(0));

  EXPECT_CALL(mock, Push(_));

  int n = 5;

  EXPECT_CALL(mock, GetTop())

      .WillOnce(ReturnRef(n));

  EXPECT_CALL(mock, Pop())

      .Times(AnyNumber());

  EXPECT_EQ(0, mock.GetSize());

  mock.Push(5);

  EXPECT_EQ(1, mock.GetSize());

  EXPECT_EQ(5, mock.GetTop());

  mock.Pop();

  EXPECT_EQ(0, mock.GetSize());

}

TEST(TemplateMockTest, MethodWithCommaInReturnTypeWorks) {

  MockStack<int> mock;

  const std::map<int, int> a_map;

  EXPECT_CALL(mock, ReturnTypeWithComma())

      .WillOnce(Return(a_map));

  EXPECT_CALL(mock, ReturnTypeWithComma(1))

      .WillOnce(Return(a_map));

  EXPECT_EQ(a_map, mock.ReturnTypeWithComma());

  EXPECT_EQ(a_map, mock.ReturnTypeWithComma(1));

}

#if GTEST_OS_WINDOWS

// Tests mocking template interfaces with calltype.

template <typename T>

class StackInterfaceWithCallType {

 public:

  virtual ~StackInterfaceWithCallType() {}

  // Template parameter appears in function parameter.

  STDMETHOD_(void, Push)(const T& value) = 0;

  STDMETHOD_(void, Pop)() = 0;

  STDMETHOD_(int, GetSize)() const = 0;

  // Template parameter appears in function return type.

  STDMETHOD_(const T&, GetTop)() const = 0;

};

template <typename T>

class MockStackWithCallType : public StackInterfaceWithCallType<T> {

 public:

  MockStackWithCallType() {}

  MOCK_METHOD1_T_WITH_CALLTYPE(STDMETHODCALLTYPE, Push, void(const T& elem));

  MOCK_METHOD0_T_WITH_CALLTYPE(STDMETHODCALLTYPE, Pop, void());

  MOCK_CONST_METHOD0_T_WITH_CALLTYPE(STDMETHODCALLTYPE, GetSize, int());

  MOCK_CONST_METHOD0_T_WITH_CALLTYPE(STDMETHODCALLTYPE, GetTop, const T&());

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockStackWithCallType);

};

// Tests that template mock with calltype works.

TEST(TemplateMockTestWithCallType, Works) {

  MockStackWithCallType<int> mock;

  EXPECT_CALL(mock, GetSize())

      .WillOnce(Return(0))

      .WillOnce(Return(1))

      .WillOnce(Return(0));

  EXPECT_CALL(mock, Push(_));

  int n = 5;

  EXPECT_CALL(mock, GetTop())

      .WillOnce(ReturnRef(n));

  EXPECT_CALL(mock, Pop())

      .Times(AnyNumber());

  EXPECT_EQ(0, mock.GetSize());

  mock.Push(5);

  EXPECT_EQ(1, mock.GetSize());

  EXPECT_EQ(5, mock.GetTop());

  mock.Pop();

  EXPECT_EQ(0, mock.GetSize());

}

#endif  // GTEST_OS_WINDOWS

#define MY_MOCK_METHODS1_ \

    MOCK_METHOD0(Overloaded, void()); \

    MOCK_CONST_METHOD1(Overloaded, int(int n)); \

    MOCK_METHOD2(Overloaded, bool(bool f, int n))

class MockOverloadedOnArgNumber {

 public:

  MockOverloadedOnArgNumber() {}

  MY_MOCK_METHODS1_;

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockOverloadedOnArgNumber);

};

TEST(OverloadedMockMethodTest, CanOverloadOnArgNumberInMacroBody) {

  MockOverloadedOnArgNumber mock;

  EXPECT_CALL(mock, Overloaded());

  EXPECT_CALL(mock, Overloaded(1)).WillOnce(Return(2));

  EXPECT_CALL(mock, Overloaded(true, 1)).WillOnce(Return(true));

  mock.Overloaded();

  EXPECT_EQ(2, mock.Overloaded(1));

  EXPECT_TRUE(mock.Overloaded(true, 1));

}

#define MY_MOCK_METHODS2_ \

    MOCK_CONST_METHOD1(Overloaded, int(int n)); \

    MOCK_METHOD1(Overloaded, int(int n));

class MockOverloadedOnConstness {

 public:

  MockOverloadedOnConstness() {}

  MY_MOCK_METHODS2_;

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MockOverloadedOnConstness);

};

TEST(OverloadedMockMethodTest, CanOverloadOnConstnessInMacroBody) {

  MockOverloadedOnConstness mock;

  const MockOverloadedOnConstness* const_mock = &moc;;

  EXPECT_CALL(mock, Overloaded(1)).WillOnce(Return(2));

  EXPECT_CALL(*const_mock, Overloaded(1)).WillOnce(Return(3));

  EXPECT_EQ(2, mock.Overloaded(1));

  EXPECT_EQ(3, const_mock->Overloaded(1));

}

TEST(MockFunctionTest, WorksForVoidNullary) {

  MockFunction<void()> foo;

  EXPECT_CALL(foo, Call());

  foo.Call();

}

TEST(MockFunctionTest, WorksForNonVoidNullary) {

  MockFunction<int()> foo;

  EXPECT_CALL(foo, Call())

      .WillOnce(Return(1))

      .WillOnce(Return(2));

  EXPECT_EQ(1, foo.Call());

  EXPECT_EQ(2, foo.Call());

}

TEST(MockFunctionTest, WorksForVoidUnary) {

  MockFunction<void(int)> foo;

  EXPECT_CALL(foo, Call(1));

  foo.Call(1);

}

TEST(MockFunctionTest, WorksForNonVoidBinary) {

  MockFunction<int(bool, int)> foo;

  EXPECT_CALL(foo, Call(false, 42))

      .WillOnce(Return(1))

      .WillOnce(Return(2));

  EXPECT_CALL(foo, Call(true, Ge(100)))

      .WillOnce(Return(3));

  EXPECT_EQ(1, foo.Call(false, 42));

  EXPECT_EQ(2, foo.Call(false, 42));

  EXPECT_EQ(3, foo.Call(true, 120));

}

TEST(MockFunctionTest, WorksFor10Arguments) {

  MockFunction

                   int a5, int a6, char a7, int a8, bool a9)> foo;

  EXPECT_CALL(foo, Call(_, 'a', _, _, _, _, _, _, _, _))

      .WillOnce(Return(1))

      .WillOnce(Return(2));

  EXPECT_EQ(1, foo.Call(false, 'a', 0, 0, 0, 0, 0, 'b', 0, true));

  EXPECT_EQ(2, foo.Call(true, 'a', 0, 0, 0, 0, 0, 'b', 1, false));

}

#if GTEST_HAS_STD_FUNCTION_

TEST(MockFunctionTest, AsStdFunction) {

  MockFunction<int(int)> foo;

  auto call = [](const std::function<int(int)> &f, int i) {

    return f(i);

  };

  EXPECT_CALL(foo, Call(1)).WillOnce(Return(-1));

  EXPECT_CALL(foo, Call(2)).WillOnce(Return(-2));

  EXPECT_EQ(-1, call(foo.AsStdFunction(), 1));

  EXPECT_EQ(-2, call(foo.AsStdFunction(), 2));

}

TEST(MockFunctionTest, AsStdFunctionReturnsReference) {

  MockFunction<int&()> foo;

  int value = 1;

  EXPECT_CALL(foo, Call()).WillOnce(ReturnRef(value));

  int& ref = foo.AsStdFunction()();

  EXPECT_EQ(1, ref);

  value = 2;

  EXPECT_EQ(2, ref);

}

#endif  // GTEST_HAS_STD_FUNCTION_

}  // namespace gmock_generated_function_mockers_test

}  // namespace testing