Простое тестирование

#ifndef _concat_H_
#define _concat_H_
 
char* analog_strcat(char* arg1, const char* arg2)
{
    char* rdest = arg1;
 
    while (*arg1)
        arg1++;
    while (*arg1++ = *arg2++)
        ;
    return rdest;
}
 
#endif

#include <iostream>
#include "concat.h"
 
using namespace std;
 
const int size_char = 25;
 
struct Test {
    char arg1[size_char];
    char arg2[size_char];
    char out[size_char];
};
 
void testFunc(Test &CStyleString) {
    cout << "Test string #1: " << CStyleString.arg1 << endl;
    cout << "Test string #2: " << CStyleString.arg2 << endl;
    cout << "Expected Result: " << CStyleString.out << endl;
    analog_strcat(CStyleString.arg1, CStyleString.arg2);
    if (strcmp(CStyleString.arg1, CStyleString.out)) {
        cout << "Test ended with an error.\n" << endl;
    }
    else {
        cout << "Test Сompleted Successfully!\n" << endl;
    }
}
 
int main()
{
    Test test_1{"My first ", "test", "My first test"};
    Test test_2{"Never wrote ", "tests in C++", "Never wrote tests in C++"};
    Test test_3{"I am working ", "in Python", "I am working in Python"};
 
    testFunc(test_1);
    testFunc(test_2);
    testFunc(test_3);
 
}