c++ 單元測試打樁技巧總結(stub、mock)
阿新 • • 發佈:2019-01-24
說明:
- 只適用linux,和windows的x86、x64架構
- access private function相關方法基於C++11(參考:https://github.com/martong/access_private)
- replace function相關方法基於C++03
- windows和linux的用法會稍微不同,原因是獲取不同型別函式地址的方法不同,且呼叫約定有時不一樣
不可以打樁的情況:
- 不可以對exit函式打樁,編譯器做了特殊優化
- 不可以對純虛擬函式打樁,純虛擬函式沒有地址
- static宣告的普通內部函式不能打樁,內部函式地址不可見(解析ELF或許可以獲得函式地址)
普通函式打樁(非static)
//for linux and windows
#include<iostream>
#include "stub.h"
using namespace std;
int foo(int a)
{
cout<<"I am foo"<<endl;
return 0;
}
int foo_stub(int a)
{
cout<<"I am foo_stub"<<endl;
return 0;
}
int main()
{
Stub stub;
stub.set (foo, foo_stub);
foo(1);
return 0;
}
例項成員函式打樁
//for linux,__cdecl
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int i;
public:
int foo(int a){
cout<<"I am A_foo"<<endl;
return 0;
}
};
int foo_stub(void* obj, int a)
{
A* o= (A*)obj;
cout <<"I am foo_stub"<<endl;
return 0;
}
int main()
{
Stub stub;
stub.set(ADDR(A,foo), foo_stub);
A a;
a.foo(1);
return 0;
}
//for windows,__thiscall
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int i;
public:
int foo(int a){
cout<<"I am A_foo"<<endl;
return 0;
}
};
class B{
public:
int foo_stub(int a){
cout<<"I am foo_stub"<<endl;
return 0;
}
};
int main()
{
Stub stub;
stub.set(ADDR(A,foo), ADDR(B,foo_stub));
A a;
a.foo(1);
return 0;
}
靜態成員函式打樁
//for linux and windows
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int i;
public:
static int foo(int a){
cout<<"I am A_foo"<<endl;
return 0;
}
};
int foo_stub(int a)
{
cout<<"I am foo_stub"<<endl;
return 0;
}
int main()
{
Stub stub;
stub.set(ADDR(A,foo), foo_stub);
A::foo(1);
return 0;
}
模板函式打樁
//for linux,__cdecl
#include<iostream>
#include "stub.h"
using namespace std;
class A{
public:
template<typename T>
int foo(T a)
{
cout<<"I am A_foo"<<endl;
return 0;
}
};
int foo_stub(void* obj, int x)
{
A* o= (A*)obj;
cout<<"I am foo_stub"<<endl;
return 0;
}
int main()
{
Stub stub;
stub.set((int(A::*)(int))ADDR(A,foo), foo_stub);
A a;
a.foo(5);
return 0;
}
//for windows,__thiscall
#include<iostream>
#include "stub.h"
using namespace std;
class A{
public:
template<typename T>
int foo(T a)
{
cout<<"I am A_foo"<<endl;
return 0;
}
};
class B {
public:
int foo_stub(int a) {
cout << "I am foo_stub" << endl;
return 0;
}
};
int main()
{
Stub stub;
stub.set((int(A::*)(int))ADDR(A,foo), ADDR(B, foo_stub));
A a;
a.foo(5);
return 0;
}
過載函式打樁
//for linux,__cdecl
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int i;
public:
int foo(int a){
cout<<"I am A_foo_int"<<endl;
return 0;
}
int foo(double a){
cout<<"I am A_foo-double"<<endl;
return 0;
}
};
int foo_stub_int(void* obj,int a)
{
A* o= (A*)obj;
cout<<"I am foo_stub_int"<< a << endl;
return 0;
}
int foo_stub_double(void* obj,double a)
{
A* o= (A*)obj;
cout<<"I am foo_stub_double"<< a << endl;
return 0;
}
int main()
{
Stub stub;
stub.set((int(A::*)(int))ADDR(A,foo), foo_stub_int);
stub.set((int(A::*)(double))ADDR(A,foo), foo_stub_double);
A a;
a.foo(5);
a.foo(1.1);
return 0;
}
//for windows,__thiscall
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int i;
public:
int foo(int a){
cout<<"I am A_foo_int"<<endl;
return 0;
}
int foo(double a){
cout<<"I am A_foo-double"<<endl;
return 0;
}
};
class B{
int i;
public:
int foo_stub_int(int a)
{
cout << "I am foo_stub_int" << a << endl;
return 0;
}
int foo_stub_double(double a)
{
cout << "I am foo_stub_double" << a << endl;
return 0;
}
};
int main()
{
Stub stub;
stub.set((int(A::*)(int))ADDR(A,foo), ADDR(B, foo_stub_int));
stub.set((int(A::*)(double))ADDR(A,foo), ADDR(B, foo_stub_double));
A a;
a.foo(5);
a.foo(1.1);
return 0;
}
虛擬函式打樁
//for linux
#include<iostream>
#include "stub.h"
using namespace std;
class A{
public:
virtual int foo(int a){
cout<<"I am A_foo"<<endl;
return 0;
}
};
int foo_stub(void* obj,int a)
{
A* o= (A*)obj;
cout<<"I am foo_stub"<<endl;
return 0;
}
int main()
{
typedef int (*fptr)(A*,int);
fptr A_foo = (fptr)(&A::foo); //獲取虛擬函式地址
Stub stub;
stub.set(A_foo, foo_stub);
A a;
a.foo();
return 0;
}
//for windows x86(32位)
#include<iostream>
#include "stub.h"
using namespace std;
class A {
public:
virtual int foo(int a) {
cout << "I am A_foo" << endl;
return 0;
}
};
class B {
public:
int foo_stub(int a)
{
cout << "I am foo_stub" << endl;
return 0;
}
};
int main()
{
unsigned long addr;
_asm {mov eax, A::foo}
_asm {mov addr, eax}
Stub stub;
stub.set(addr, ADDR(B, foo_stub));
A a;
a.foo(1);
return 0;
}
//for windows x64(64位),VS編譯器不支援內嵌彙編。有解決方案自行搜尋。
行內函數打樁
//for linux
//新增-fno-inline編譯選項,禁止內聯,能獲取到函式地址,打樁參考上面。
//for windows
//新增/Ob0禁用內聯展開。
第三方庫私有成員函式打樁
//for linux
//被測程式碼新增-fno-access-private編譯選項,禁用訪問許可權控制,成員函式都為公有的
//無原始碼的動態庫或靜態庫無法自己編譯,需要特殊技巧獲取函式地址
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int a;
int foo(int x){
cout<<"I am A_foo "<< a << endl;
return 0;
}
static int b;
static int bar(int x){
cout<<"I am A_bar "<< b << endl;
return 0;
}
};
ACCESS_PRIVATE_FIELD(A, int, a);
ACCESS_PRIVATE_FUN(A, int(int), foo);
ACCESS_PRIVATE_STATIC_FIELD(A, int, b);
ACCESS_PRIVATE_STATIC_FUN(A, int(int), bar);
int foo_stub(void* obj, int x)
{
A* o= (A*)obj;
cout<<"I am foo_stub"<<endl;
return 0;
}
int bar_stub(int x)
{
cout<<"I am bar_stub"<<endl;
return 0;
}
int main()
{
A a;
auto &A_a = access_private_field::Aa(a);
auto &A_b = access_private_static_field::A::Ab();
A_a = 1;
A_b = 10;
call_private_fun::Afoo(a,1);
call_private_static_fun::A::Abar(1);
auto A_foo= get_private_fun::Afoo();
auto A_bar = get_private_static_fun::A::Abar();
Stub stub;
stub.set(A_foo, foo_stub);
stub.set(A_bar, bar_stub);
call_private_fun::Afoo(a,1);
call_private_static_fun::A::Abar(1);
return 0;
}
//for windows,__thiscall
#include<iostream>
#include "stub.h"
using namespace std;
class A{
int a;
int foo(int x){
cout<<"I am A_foo "<< a << endl;
return 0;
}
static int b;
static int bar(int x){
cout<<"I am A_bar "<< b << endl;
return 0;
}
};
ACCESS_PRIVATE_FIELD(A, int, a);
ACCESS_PRIVATE_FUN(A, int(int), foo);
ACCESS_PRIVATE_STATIC_FIELD(A, int, b);
ACCESS_PRIVATE_STATIC_FUN(A, int(int), bar);
class B {
public:
int foo_stub(int x)
{
cout << "I am foo_stub" << endl;
return 0;
}
};
int bar_stub(int x)
{
cout<<"I am bar_stub"<<endl;
return 0;
}
int main()
{
A a;
auto &A_a = access_private_field::Aa(a);
auto &A_b = access_private_static_field::A::Ab();
A_a = 1;
A_b = 10;
call_private_fun::Afoo(a,1);
call_private_static_fun::A::Abar(1);
auto A_foo= get_private_fun::Afoo();
auto A_bar = get_private_static_fun::A::Abar();
Stub stub;
stub.set(A_foo, ADDR(B,foo_stub));
stub.set(A_bar, bar_stub);
call_private_fun::Afoo(a,1);
call_private_static_fun::A::Abar(1);
return 0;
}