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