@Test
public void getAllTest() {

    cache.put(key1, ontNoImports);
    cache.put(key2, ontOneImport);
    cache.put(key3, ontMultipleImports);
    Map<String, Ontology> map = cache.getAll(Stream.of(key1, key2, key3).collect(Collectors.toSet()));
    assertEquals(3, map.size());
    assertEquals(map.get(key1), ontNoImports);
    assertEquals(map.get(key2), ontOneImport);
    assertEquals(map.get(key3), ontMultipleImports);
}