@Test
public void keyShouldBeComposedFromUserAndDepth() {
Map<String, Set<String>> graph = Collections.singletonMap("a", Collections.singleton("b"));
cache.putGraph("a", 2, graph);
assertTrue(cache.getGraph("a", 5).isEmpty());
}
@Test
public void putAndGet() {
Map<String, Set<String>> graph = Collections.singletonMap("a", Collections.singleton("b"));
cache.putGraph("a", 1, graph);
Map<String, Set<String>> actual = cache.getGraph("a", 1);
assertEquals(graph, actual);
}