assertThat(call.tag(Integer::class.java)).isEqualTo(5)
    assertThat(call.tag(Boolean::class.java)).isNull()
    assertThat(call.tag(Any::class.java)).isNull()
  }

  @Test
  fun tagsCanBeComputed() {
    val request =
      Request
        .Builder()
        .url("https://square.com")
        .build()
    val call = client.newCall(request)

    // Check the Kotlin-focused APIs.

    assertEquals("hello", call.tag(String.class));
    assertEquals(null, call.tag(Boolean.class));
    assertEquals(null, call.tag(Object.class));
  }

  @Test
  public void tagsCanBeComputed() {
    Request request = new Request.Builder()
      .url(HttpUrl.get("https://square.com/"))
      .build();
    Call call = client.newCall(request);

    assertEquals("a", call.tag(String.class, () -> "a"));