@Test
void getOrComputeMany() {

    final LongCache<String> lc = new LongCache<>(2);
    final long actual1 = lc.getOrCompute("one", () -> 1L);
    assertEquals(1L, actual1);
    final long actual2 = lc.getOrCompute("two", () -> 2L);
    assertEquals(2L, actual2);
    final long actual3 = lc.getOrCompute("three", () -> 3L);
    assertEquals(3L, actual3);
}