Magic Number Test - Refactored - Toy Example

final int FIRST_VALUE = 1;
final int LAST_VALUE = 3653;
@Test
public void test() {
    Map map = new Map();
    Key key = new Key();
    map.set(key, LAST_VALUE);
    assertThat(map.get(key)).isEqualTo(LAST_VALUE);
    map.set(key, FIRST_VALUE);
    assertThat(map.get(key)).isEqualTo(FIRST_VALUE);
}