Iterator<String> iterator = singletonList("foo").iterator();
    assertThat(getOnlyElement(iterator, "bar")).isEqualTo("foo");
  }

  public void testGetOnlyElement_withDefault_empty() {
    Iterator<String> iterator = emptyIterator();
    assertThat(getOnlyElement(iterator, "bar")).isEqualTo("bar");
  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();

    Iterator<String> iterator = singletonList("foo").iterator();
    assertThat(getOnlyElement(iterator, "bar")).isEqualTo("foo");
  }

  public void testGetOnlyElement_withDefault_empty() {
    Iterator<String> iterator = emptyIterator();
    assertThat(getOnlyElement(iterator, "bar")).isEqualTo("bar");
  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();

                + "<img src=\"http://example/bar.jpg\">";
        expected = "http://example/foo.jpg";
        assertGetThumbnailUrl(data, expected);

        data = "<img src=\"http://example/foo.jpg\">" //
                + "<img src=\"http://example/bar.jpg\" width=\"100\" height=\"100\">";
        expected = "http://example/bar.jpg";
        assertGetThumbnailUrl(data, expected);

			query:      `SELECT synonyms from s3object s WHERE 'bar' IN s.synonyms[*] `,
			wantResult: `{"synonyms":["foo","bar","whatever"]}`,
		},
		{
			name:       "donatello-1",
			query:      `SELECT * from s3object s WHERE 'bar' in s.synonyms`,
			wantResult: `{"id":0,"title":"Test Record","desc":"Some text","synonyms":["foo","bar","whatever"]}`,
		},
		{
			name:       "donatello-2",

	r.Read(buf)
	if string(buf) != "foo" {
		t.Errorf("buf = %q; want foo", buf)
	}

	r.Reset(strings.NewReader("bar bar"))
	checkAll(r, "bar bar")

	*r = Reader{} // zero out the Reader
	r.Reset(strings.NewReader("bar bar"))
	checkAll(r, "bar bar")

	// Wrap a reader and then Reset to that reader.
	r.Reset(strings.NewReader("recur"))
	r2 := NewReader(r)
	checkAll(r2, "recur")

			{
				Name:     "foo.txt",
				Content:  []byte("foo\n"),
				Modified: time.Date(2012, 3, 8, 16, 59, 10, 0, timeZone(-8*time.Hour)),
				Mode:     0644,
			},
			{
				Name:     "bar.txt",
				Content:  []byte("bar\n"),
				Modified: time.Date(2012, 3, 8, 16, 59, 12, 0, timeZone(-8*time.Hour)),
				Mode:     0644,
			},
		},
	},
	{
		// created by Go, after we wrote the "optional" data

                callCount.incrementAndGet();
                startSignal.await();
                return result;
              }
            });

    List<Object> resultArray = doConcurrentGet(cache, "bar", count, startSignal);

    assertThat(callCount.get()).isEqualTo(1);
    for (int i = 0; i < count; i++) {
      assertWithMessage("result(%s) didn't match expected", i)
          .that(resultArray.get(i))

    assertThat(url.queryParameterValues("bar")).isEqualTo(listOf(null as String?))
    assertThat(url.queryParameterValues("baz")).isEqualTo(listOf(null as String?))
  }

  @Test
  fun queryParametersWithEmptyValues() {
    val url = parse("http://host/?foo=&bar=&baz=")
    assertThat(url.querySize).isEqualTo(3)
    assertThat(url.queryParameterNames).containsExactlyInAnyOrder("foo", "bar", "baz")

    assertThat(pushedRequest.requestLine).isEqualTo("GET /foo/bar HTTP/2")
    assertThat(pushedRequest.headers["foo"]).isEqualTo("bar")
  }

  @Test
  fun serverSendsPushPromise_HEAD() {
    val pushPromise =
      PushPromise(
        "HEAD",
        "/foo/bar",
        headersOf("foo", "bar"),
        MockResponse(code = 204),
      )
    server.enqueue(

  public void testTreeMapDerived() {
    TreeMap<Derived, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    map.put(new Derived("foo"), 1);
    map.put(new Derived("bar"), 2);
    assertThat(map.keySet()).containsExactly(new Derived("bar"), new Derived("foo")).inOrder();
    assertThat(map.values()).containsExactly(2, 1).inOrder();
    assertThat(map.comparator()).isNull();
  }

  public void testTreeMapNonGeneric() {