int pin1 = 11;
int pin2 = 12;

class Test1 {
  public:
    Test1(int pin) {
      _pin = pin;
    };
    void go(void) {
      digitalWrite(_pin, 1);
    };
  private:
    int _pin;
};


class Test2 {
  public:
    Test2(int pin) {
      Test1 test1(pin);
      _test1 = &test1;
    };
    void go(void) {
      _test1->go();
    };
  private:
    Test1 *_test1;
};

Test1 tescik1(pin1);
Test2 tescik2(pin2);

void setup() {
  pinMode(pin1, OUTPUT);
  pinMode(pin2, OUTPUT);
}

void loop() {
  tescik1.go();
  tescik2.go();
}