@Test
public void testJoinDoubleArray() {

	Assert.assertNull(TaskHelper.join((double[]) null, '1', 2, 3));
	Assert.assertEquals("", TaskHelper.join(new double[]{5.1}, '\u0000'));
	Assert.assertEquals("2.1\u00004.5", TaskHelper.join(new double[]{2.1, 4.5}, '\u0000'));
	Assert.assertEquals("", TaskHelper.join(new double[]{5.1, 9.2}, '\u0000', 119, 96));
}