public void testGetFirst_withDefault_empty_null() {
    Iterable<String> iterable = emptyList();
    assertThat(Iterables.<@Nullable String>getFirst(iterable, null)).isNull();
  }

  public void testGetFirst_withDefault_multiple() {
    Iterable<String> iterable = asList("foo", "bar");
    assertEquals("foo", Iterables.getFirst(iterable, "qux"));
  }

  public void testGetLast_list() {