### Question:
OldSource { public int accumulateMul(int... nums) { LOGGER.info("Source module {}", VERSION); var sum = 1; for (final var num : nums) { sum *= num; } return sum; }  int accumulateSum(int... nums); int accumulateMul(int... nums);  }### Answer:
@Test public void testAccumulateMul() { assertEquals(0, source.accumulateMul(-1, 0, 1)); }