@Test
public void testGetA() throws Exception {

    Assert.assertEquals(1, ARGB.getA(-1), 0.1);
    Assert.assertEquals(0, ARGB.getA(0), 0.1);
    Assert.assertEquals(1, ARGB.getA(0xFF000000), 0.1);
    Assert.assertEquals(0, ARGB.getA(0x00FFFFFF), 0.1);
}