我正在使用gmock来模拟一个底层库，同时我正在测试我的包装器。我注意到gmock要求mock对象必须是预定义的，我想传递一个指向mock对象的指针。我想要的是传递一个指向mock对象的指针。如果这个对象是动态创建的，那就不行了，因为测试错误处理需要这个对象。
参考: gmockgoogle-mock发出警告，并以嘲讽异常的方式导致测试失败。编码。
testmock_turtle_test.cc
#include "mock_turtle.h"
#include "../painter.h"
#include <gtest/gtest.h>
using ::testing::_;
using ::testing::AtLeast;
using ::testing::Return;
ACTION(MyException)
{
throw(error_k());
}
TEST(PainterTest, CanDrawSomething) {
Painter painter;
EXPECT_CALL(*(painter.getTurtle()), PenDown())
.Times(AtLeast(1))
.WillOnce(MyException())
.WillRepeatedly(Return(5));
EXPECT_TRUE(painter.DrawCircle(0, 0, 10));
}
int main(int argc, char **argv) {
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
incmock_turtle.h
#pragma once
#include <cstdlib>
#include "turtle.h"
#include <gmock/gmock.h>
class Turtle : public FakeTurtle{
public:
using FakeTurtle::FakeTurtle;
MOCK_METHOD((void), PenUp, ());
MOCK_METHOD((int), PenDown, ());
MOCK_METHOD((void), Forward, (int distance));
MOCK_METHOD((void), Turn, (int degrees));
MOCK_METHOD((void), GoTo, (int x, int y));
MOCK_METHOD((int), GetX, ());
MOCK_METHOD((int), GetY, ());
};
incturtle.h
#pragma once
class FakeTurtle {
public:
virtual ~FakeTurtle() {}
virtual void PenUp() {};
virtual int PenDown() {};
virtual void Forward(int distance) {};
virtual void Turn(int degrees) {};
virtual void GoTo(int x, int y) {};
virtual int GetX() const {};
virtual int GetY() const {};
};
画家.h
#pragma once
#include "turtle.h"
#include <cerrno>
class error_k
{
public:
error_k() : errnum(EAGAIN){}
int num() const
{
return errnum;
}
private:
int errnum;
};
class Painter
{
Turtle* turtle;
public:
Painter() : turtle(new Turtle){}
//Painter(){}
Turtle** getTurtle(){
return &turtle;
}
bool DrawCircle(int, int, int){
int rep = 10;
int ret = 0;
delete turtle;
turtle = new Turtle;
do{
try{
std::cout << "calling PenDown() : rep = " <<
rep << " , ret = " << ret << std::endl;
ret = turtle->PenDown();
if(ret > 0)
return true;
}catch(error_k err )
{
std::cout << "Caught Exception (" <<
err.num() << "): rep = " <<
rep << " , ret = " << ret << std::endl;
delete turtle;
turtle = new Turtle();
}
}while(rep-- > 0 && ret == 0);
return false;
}
~Painter(){
delete turtle;
}
};
CmakeLists.txt
cmake_minimum_required(VERSION 2.6)
# Locate GTest
find_package(GTest REQUIRED)
find_package(PkgConfig)
message(STATUS "gtest found: " ${GTEST_FOUND})
pkg_check_modules(GMOCK "gmock" REQUIRED)
message(STATUS "gmock found: " ${GMOCK_FOUND})
include_directories(${GTEST_INCLUDE_DIRS})
# Link runTests with what we want to test and the GTest and pthread library
add_executable(runTests test/mock_turtle_test.cc)
target_link_libraries(runTests ${GTEST_LIBRARIES} ${GMOCK_LIBRARIES} gmock gmock_main gtest gtest_main)
target_include_directories(runTests SYSTEM PRIVATE inc)
add_test(NAME runTests COMMAND runTests)
enable_testing()
输出。
$ make ; ./runTests
Scanning dependencies of target runTests
[ 50%] Building CXX object CMakeFiles/runTests.dir/test/mock_turtle_test.cc.o
[100%] Linking CXX executable runTests
[100%] Built target runTests
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from PainterTest
[ RUN ] PainterTest.CanDrawSomething
/home/preetam/Desktop/gmock/cpp_mock_ptr/test/mock_turtle_test.cc:16: Failure
Actual function call count doesn't match EXPECT_CALL(**tt, PenDown())...
Expected: to be called at least once
Actual: never called - unsatisfied and active
calling PenDown() : rep = 10 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 9 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 8 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 7 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 6 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 5 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 4 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 3 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 2 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 1 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
calling PenDown() : rep = 0 , ret = 0
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: PenDown()
Returns: 0
NOTE: You can safely ignore the above warning unless this call should not happen. Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call. See https://github.com/google/googletest/blob/master/googlemock/docs/cook_book.md#knowing-when-to-expect for details.
/home/preetam/Desktop/gmock/cpp_mock_ptr/test/mock_turtle_test.cc:20: Failure
Value of: painter.DrawCircle(0, 0, 10)
Actual: false
Expected: true
[ FAILED ] PainterTest.CanDrawSomething (0 ms)
[----------] 1 test from PainterTest (0 ms total)
[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (1 ms total)
[ PASSED ] 0 tests.
[ FAILED ] 1 test, listed below:
[ FAILED ] PainterTest.CanDrawSomething
1 FAILED TEST
你可以创建一个类型为 FakeTurtle 并使用依赖注入技术（见 用unique_ptr注入依赖关系来模拟。 如果 Painter 需要成为被注入对象的所有者；但首先要尝试重构你的代码，使其能在 Painter 接受对Turtle的引用，例如 Turtle& 在它的构造函数中--这样更容易）。)
GoogleMock框架要求创建一个mock对象，并且所有的期望都设置在这个对象上（而不是其他对象）。
附注：我会将 Turtle 一个纯虚拟的接口。