@Test public void sumUsingWhileLoop() { assertThat(arrayOperations.sumUsingWhileLoop(null), is(0)); assertThat(arrayOperations.sumUsingWhileLoop(new int[] {}), is(0)); assertThat(arrayOperations.sumUsingWhileLoop(new int[] {1}), is(1)); assertThat(arrayOperations.sumUsingWhileLoop(new int[] {1, 4, 5, 8}), is(18)); }