@Test
public void testJoinNumberArray() {

	Assert.assertNull(TaskHelper.join((Number[]) null, '1', 2, 3));
	Assert.assertEquals("", TaskHelper.join(new Number[0], '\u0000'));
	Assert.assertEquals("-100\u0000-891", TaskHelper.join(new Number[]{-100, -891}, '\u0000', 0, 1));
	Assert.assertEquals("", TaskHelper.join(new Number[0], '\u0000', 139, -1744));
}