### Question:
MathUtils { public static long increment(long l) { return l + 1; }  static double divide(double dividend, double divisor); static long increment(long l); static double[] max(double[] d1, double[] d2); static long multiply(long factor1, long factor2); static int roundToInt(double d);  }### Answer:
@Test public void testIncrement() { assertThat(MathUtils.increment(8L)).isEqualTo(9L); assertThat(MathUtils.increment(0L)).isEqualTo(1L); assertThat(MathUtils.increment(-8L)).isEqualTo(-7L); }