@Test
void testCombineTTArray() {

    
    assertArrayEquals(new Integer[]{1}, _Arrays.combine(1));
    assertArrayEquals(new Integer[]{1, 2}, _Arrays.combine(1, 2));
    assertArrayEquals(new Integer[]{1, 2, 3}, _Arrays.combine(1, 2, 3));
    assertArrayEquals(new Integer[]{1, 2, 3, 4}, _Arrays.combine(1, 2, 3, 4));
    
}