### Question:
NewSource { public int accumulateMul(int... nums) { LOGGER.info(SOURCE_MODULE, VERSION); return Arrays.stream(nums).reduce(1, (a, b) -> a * b); }  int accumulateSum(int... nums); int accumulateMul(int... nums); boolean ifNonZero(int... nums); static final String SOURCE_MODULE; }### Answer:
@Test public void testAccumulateMul() { assertEquals(0, source.accumulateMul(-1, 0, 1)); }