void setup(){
  unittestLimit();
}

/**
 * Limits a value to a given range
 * @param    minValue   the smallest allowed value (inclusive)
 * @param    value  the value
 * @param    maxValue   the largest allowed value (incluseive)
 * @return   the value, if it is inside the range, else the closest allowed value 
 * @throws   IllegalArgumentException if minValue is larger than maxValue 
 */
int limit(int minValue, int value, int maxValue){
  if (minValue > maxValue){
    throw new IllegalArgumentException("invalid range [" + minValue + ", " + maxValue + "]");
  }
  return max(minValue, min(value, maxValue));
}


void unittestLimit(){
  assertEqual(100, limit(0, 100, 200), "in range"); 
  assertEqual(0, limit(0, -300, 200), "negative. lower");
  assertEqual(200, limit(0, 300, 200), "higher");
  assertEqual(0, limit(0, 0, 0), "all identical values");
  assertEqual(0, limit(0, 0, 10), "on lower limit");
  assertEqual(100, limit(0, 100, 100), "on upper limit");
}

/* crude unit test method.
 * Prints an error message if the actual value is different from the expected, else does nothing.
 * @param  expected  the value you expect
 * @param  actual the actual value 
 * @param  message  A message that helps you identify what went wrong (printed on failure)
 */
void assertEqual(int expected, int actual, String message){
  if (actual != expected){
    System.err.println("Assertion failed (" + message+ "): expected " + expected + ", got " + actual);
  }
}