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