assertThat(multimap.get("foo")).containsExactly(1, 2, 1, 6, 7, 2).inOrder();
    assertThat(multimap.get("bar")).containsExactly(4, 5, 4).inOrder();
    assertEquals(9, multimap.size());
  }

  public void testBuilderPutNullKey() {
    Multimap<@Nullable String, Integer> toPut = LinkedListMultimap.create();
    toPut.put(null, 1);
    ImmutableListMultimap.Builder<String, Integer> builder = ImmutableListMultimap.builder();

        NullPointerException.class, () -> builder.put(new SimpleEntry<String, Integer>(null, 1)));
    builder.put("foo", 2);
    assertMapEquals(builder.buildOrThrow(), "foo", 2);
  }

  public void testBuilderPutNullKey() {
    Builder<String, Integer> builder = new Builder<>();
    assertThrows(NullPointerException.class, () -> builder.put(null, 1));
  }

  public void testBuilderPutNullValue() {