public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Ints.concat()));
assertTrue(Arrays.equals(EMPTY, Ints.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Ints.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Ints.concat(ARRAY1)));
assertNotSame(ARRAY1, Ints.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Ints.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(
Arrays.equals(new int[] {(int) 1, (int) 1, (int) 1}, Ints.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(
Arrays.equals(
new int[] {(int) 1, (int) 2, (int) 3, (int) 4}, Ints.concat(ARRAY1, ARRAY234)));
}