如何对C进行单元测试(借助代码块)？

void ServerUserWrite(int Command)  //Command "1" prints an extra row into server. For example addinga new user. it expects that the extra row with the correct data is already exisTing in the structure.
{
        FILE *UserDataBase;
        int i,j;
        UserDataBase=fopen(UserDatabasePath,"w");
        if(Command==1)
        {ServerUserCount=ServerUserCount+1;}
        fprintf(UserDataBase,"%d\n",ServerUserCount);
        if(ServerUserCount>0)
        {
                for(i=0;i<ServerUserCount;i++)
                {
                        fprintf(UserDataBase,"%d ",UserDB[i].UserID);
                        fprintf(UserDataBase,"%s ",UserDB[i].User);
                        fprintf(UserDataBase,UserDB[i].UserpasswordLength);
                        fprintf(UserDataBase,UserDB[i].Encrypter);
                        for (j=0;j<UserDB[i].UserpasswordLength;j++)
                        {fprintf(UserDataBase,UserDB[i].Pass[j]);}
                        fprintf(UserDataBase,UserDB[i].BACkgroundColor);
                        fprintf(UserDataBase,UserDB[i].ForegroundColor);
                        fprintf(UserDataBase,UserDB[i].Unreadmessages);
                        fprintf(UserDataBase,UserDB[i].UnreadTweets);
                }
        }
        fclose(UserDataBasE);
}

那么问题是：
是否有任何单元测试框架与代码块结合？
怎么做？