如何解决使用 Googlemock 进行依赖注入和模拟的实际示例
我正在寻找一个简单的完整剪切和粘贴示例,用于使用 Googlemock 进行依赖注入和模拟。我发现了一些关于代码片段问题的理论讨论,这些代码片段解释了它是如何工作的,但无法找到完整的运行示例来剪切和粘贴并尝试。有什么可用的吗?
解决方法
为了了解它如何与 Googlemock 配合使用,我制作了这个完整的示例,我想与该主题的其他初学者分享。根据其他问答理论背景假设。我在 Debian Bullseye 系统上运行它。
虚构库中有一个类 Mylib
,该方法只返回 123
。在测试中,它被模拟为返回 456
。真实类和模拟类都继承自接口类。这确保了由注入器(TEST(..){..}
宏)注入到应用程序 Myapp
的不同对象具有相同的方法调用。例子如下:
~$ cat test_myapp.cpp
#include "gtest/gtest.h"
#include "gmock/gmock.h"
#include <iostream>
class MylibInterface {
public:
virtual ~MylibInterface() {}
virtual int func() = 0;
};
class Mylib : public MylibInterface {
public:
virtual ~Mylib() {}
int func() override {
return 123;
}
};
class MylibMock : public MylibInterface {
public:
virtual ~MylibMock() {}
MOCK_METHOD(int,func,(),(override));
};
class Myapp {
// this pointer will be injected by the injector either with pointing
// to the real object or to the mock object. The interface ensures that both
// objects have the same method calls.
MylibInterface* m_mylib;
public:
Myapp(MylibInterface* mylib) : m_mylib(mylib) {}
bool func() {
int ret = m_mylib->func();
std::cout << "mylib.func returns: '" << ret << "'\n";
return true;
}
};
TEST(MylibTestSuite,mock_mylib_func)
// this test macro can be seen as the injector. It determins what object
// is injected to myapp.
{
using ::testing::Return;
// inject a real mylib object to myapp and exersize it
Mylib mylib;
Myapp myapp(&mylib);
std::cout << " real ";
EXPECT_TRUE(myapp.func());
// inject a mocked mylib object to myapp
MylibMock mylib_mock;
Myapp myapp_mock(&mylib_mock);
EXPECT_CALL(mylib_mock,func())
.WillOnce(Return(456));
// and exersize it
std::cout << "mocked ";
EXPECT_TRUE(myapp_mock.func());
}
int main(int argc,char** argv) {
::testing::InitGoogleMock(&argc,argv);
return RUN_ALL_TESTS();
}
我编译它:
~$ /usr/bin/g++ -std=c++11 -pedantic-errors -Wall -o test_myapp.a -I$BUILD_DIR/googletest-src/googletest/include -I$BUILD_DIR/googletest-src/googlemock/include test_myapp.cpp $BUILD_DIR/lib/libgtestd.a $BUILD_DIR/lib/libgmockd.a -lpthread
执行测试时,它应该如下所示:
~$ ./test_myapp.a
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from MylibTestSuite
[ RUN ] MylibTestSuite.mock_mylib_func
real mylib.func returns: '123'
mocked mylib.func returns: '456'
[ OK ] MylibTestSuite.mock_mylib_func (0 ms)
[----------] 1 test from MylibTestSuite (0 ms total)
[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[ PASSED ] 1 test.
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