### Question:
MathUtils { public static long multiply(long factor1, long factor2) { return factor1 * factor2; }  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 testMultiply() { assertThat(MathUtils.multiply(8L, 2L)).isEqualTo(16L); assertThat(MathUtils.multiply(0L, 2L)).isEqualTo(0L); assertThat(MathUtils.multiply(8L, 0L)).isEqualTo(0L); }