@Test
public void testGetSetString() {

    AttributeKey<String> key = AttributeKey.valueOf("Nothing");
    Attribute<String> one = map.attr(key);
    assertSame(one, map.attr(key));
    one.setIfAbsent("Whoohoo");
    assertSame("Whoohoo", one.get());
    one.setIfAbsent("What");
    assertNotSame("What", one.get());
    one.remove();
    assertNull(one.get());
}