Iterable<String> iterable = asList("foo", "bar");
    assertThrows(IllegalArgumentException.class, () -> getOnlyElement(iterable));
  }

  public void testGetOnlyElement_withDefault_singleton() {
    Iterable<String> iterable = singletonList("foo");
    assertEquals("foo", getOnlyElement(iterable, "bar"));
  }

  public void testGetOnlyElement_withDefault_empty() {

    assertThat(expected)
        .hasMessageThat()
        .isEqualTo("expected one element but was: <one, two, three, four, five, ...>");
  }

  public void testGetOnlyElement_withDefault_singleton() {
    Iterator<String> iterator = singletonList("foo").iterator();
    assertEquals("foo", getOnlyElement(iterator, "bar"));
  }

  public void testGetOnlyElement_withDefault_empty() {