check if buttons work

void setup() {
  pinMode(4, OUTPUT); //lewa
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT); //prawa

  pinMode(8, INPUT);
  pinMode(9, INPUT); //fire button
  pinMode(10, INPUT);
}


void loop() {
  if (digitalRead(9) == HIGH) {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
  }
  else if (digitalRead(10) == HIGH) {
    digitalWrite(4, HIGH);
  }
  else if (digitalRead(8) == HIGH) {
    digitalWrite(7, HIGH);
  }
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
}