@Test
public void testGetSetInt() {

    AttributeKey<Integer> key = AttributeKey.valueOf("Nada");
    Attribute<Integer> one = map.attr(key);
    assertSame(one, map.attr(key));
    one.setIfAbsent(3653);
    assertEquals(Integer.valueOf(3653), one.get());
    one.setIfAbsent(1);
    assertNotSame(1, one.get());
    one.remove();
    assertNull(one.get());
}