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