addNode(N1);
    ImmutableSet<Integer> nodes = ImmutableSet.copyOf(networkAsMutableNetwork.nodes());
    assertFalse(networkAsMutableNetwork.addNode(N1));
    assertThat(networkAsMutableNetwork.nodes()).containsExactlyElementsIn(nodes);
  }

  @Test
  public void removeNode_existingNode() {
    assume().that(graphIsMutable()).isTrue();

    addEdge(N1, N2, E12);
    addEdge(N4, N1, E41);

    addNode(N1);
    ImmutableSet<Integer> nodes = ImmutableSet.copyOf(graph.nodes());
    assertThat(graphAsMutableGraph.addNode(N1)).isFalse();
    assertThat(graph.nodes()).containsExactlyElementsIn(nodes);
  }

  @Test
  public void removeNode_existingNode() {
    assume().that(graphIsMutable()).isTrue();

    putEdge(N1, N2);
    putEdge(N4, N1);

      assertThat(location.scanResources()).containsExactlyElementsIn(resources);
    }
  }

  public void testLocationsFrom_idempotentLocations() {
    ImmutableSet<ClassPath.LocationInfo> locations =
        ClassPath.locationsFrom(getClass().getClassLoader());
    assertThat(ClassPath.locationsFrom(getClass().getClassLoader()))
        .containsExactlyElementsIn(locations);
  }

    ImmutableSortedSet<Integer> asSet = RANGE_SET_ONE.asSet(DiscreteDomain.integers());
    assertEquals(expectedSet, asSet);
    assertThat(asSet).containsExactlyElementsIn(expectedSet).inOrder();
    assertTrue(asSet.containsAll(expectedSet));
    SerializableTester.reserializeAndAssert(asSet);
  }

  public void testAsSetHeadSet() {

    multimap.put("bar", 3);
    multimap.put("foo", 2);
    LinkedListMultimap<String, Integer> copy = LinkedListMultimap.create(multimap);
    assertEquals(multimap, copy);
    assertThat(copy.entries()).containsExactlyElementsIn(multimap.entries()).inOrder();
  }

  public void testCreateFromSize() {
    LinkedListMultimap<String, Integer> multimap = LinkedListMultimap.create(20);
    multimap.put("foo", 1);

                  }
                });
        assertWithMessage("Sets.combinations(%s, %s)", sampleSet, k)
            .that(Sets.combinations(sampleSet, k))
            .containsExactlyElementsIn(expected)
            .inOrder();
      }
    }
  }

  private static <E> Set<E> set(E... elements) {
    return ImmutableSet.copyOf(elements);
  }

    return ImmutableGraph.copyOf(graph);
  }

  private static void assertEqualCharNodes(Iterable<Character> result, String expectedCharacters) {
    assertThat(ImmutableList.copyOf(result))
        .containsExactlyElementsIn(Chars.asList(expectedCharacters.toCharArray()))
        .inOrder();
  }

  private static class RequestSavingGraph implements SuccessorsFunction<Character> {

    return ImmutableGraph.copyOf(graph);
  }

  private static void assertEqualCharNodes(Iterable<Character> result, String expectedCharacters) {
    assertThat(ImmutableList.copyOf(result))
        .containsExactlyElementsIn(Chars.asList(expectedCharacters.toCharArray()))
        .inOrder();
  }

  private static class RequestSavingGraph implements SuccessorsFunction<Character> {

    Object[] lookupKeys = new Object[] {new Object(), new Object(), new Object()};
    Map<Object, Object> result = cache.getAll(asList(lookupKeys));
    assertThat(result.keySet()).containsExactlyElementsIn(asList(lookupKeys));
    for (Entry<Object, Object> entry : result.entrySet()) {
      Object key = entry.getKey();
      Object value = entry.getValue();
      assertSame(value, result.get(key));