ImmutableValueGraph.copyOf(mutableValueGraph);

    assertThat(immutableValueGraph.asGraph()).isInstanceOf(ImmutableGraph.class);
    assertThat(immutableValueGraph).isNotInstanceOf(MutableValueGraph.class);
    assertThat(immutableValueGraph).isEqualTo(mutableValueGraph);

    mutableValueGraph.addNode("B");
    assertThat(immutableValueGraph).isNotEqualTo(mutableValueGraph);
  }

  @Test

    val headers = mapOf("User-Agent" to "").toHeaders()
    assertThat(headers.value(0)).isEqualTo("")
  }

  @Test fun ofMapTrimsKey() {
    val headers = mapOf(" User-Agent " to "OkHttp").toHeaders()
    assertThat(headers.name(0)).isEqualTo("User-Agent")
  }

  @Test fun ofMapTrimsValue() {
    val headers = mapOf("User-Agent" to " OkHttp ").toHeaders()
    assertThat(headers.value(0)).isEqualTo("OkHttp")
  }

  @Test fun durationDefaults() {
    val client = clientTestRule.newClient()
    assertThat(client.callTimeoutMillis).isEqualTo(0)
    assertThat(client.connectTimeoutMillis).isEqualTo(10000)
    assertThat(client.readTimeoutMillis).isEqualTo(10000)
    assertThat(client.writeTimeoutMillis).isEqualTo(10000)
    assertThat(client.pingIntervalMillis).isEqualTo(0)
    assertThat(client.webSocketCloseTimeout).isEqualTo(60_000)
  }

    /**
     * @throws Exception
     */
    @Test
    public void testToDate_Null() throws Exception {
        assertThat(toDate(null), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToDate_EmptyString() throws Exception {
        assertThat(toDate(""), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test

        assertThat(newArray.length, is(2));
        assertThat(newArray[0], is("111"));
        assertThat(newArray[1], is("222"));

        final String[] emptyArray = new String[0];
        assertThat(ArrayUtil.addAll((Object[]) null, (Object[]) null), is(nullValue()));
        assertThat(ArrayUtil.addAll(null, emptyArray).length, is(0));

        assertThat(args.length, is(2));
        assertThat(args[0].getRawClass(), is(sameClass(String.class)));
        assertThat(args[0].getArguments(), is(nullValue()));
        assertThat(args[1].getRawClass(), is(sameClass(Integer.class)));
        assertThat(args[1].getArguments(), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testMethodReturnType() throws Exception {

      assertThat(map.keys).isNull();
      assertThat(map.values).isNull();
      assertThat(map.links).isNull();

      map.put(1, Integer.toString(1));
      assertThat(map.needsAllocArrays()).isFalse();
      int expectedSize = max(1, i);
      assertThat(map.entries).hasLength(expectedSize);
      assertThat(map.keys).hasLength(expectedSize);
      assertThat(map.values).hasLength(expectedSize);

      Request(
        url = url,
        headers = headers,
        method = method,
        body = body,
      )
    assertThat(request.url).isEqualTo(url)
    assertThat(request.headers).isEqualTo(headers)
    assertThat(request.method).isEqualTo(method)
    assertThat(request.body).isEqualTo(body)
    assertThat(request.tags).isEmpty()
  }

  @Test
  fun constructorNoBodyNoMethod() {
    val url = "https://example.com/".toHttpUrl()

    assertThat(median().compute(SIXTEEN_SQUARES_DOUBLES))
        .isWithin(ALLOWED_ERROR)
        .of(SIXTEEN_SQUARES_MEDIAN);
  }

  public void testMedian_computeInPlace() {
    double[] dataset = Doubles.toArray(SIXTEEN_SQUARES_DOUBLES);
    assertThat(median().computeInPlace(dataset)).isWithin(ALLOWED_ERROR).of(SIXTEEN_SQUARES_MEDIAN);

    assertThat(median().compute(SIXTEEN_SQUARES_DOUBLES))
        .isWithin(ALLOWED_ERROR)
        .of(SIXTEEN_SQUARES_MEDIAN);
  }

  public void testMedian_computeInPlace() {
    double[] dataset = Doubles.toArray(SIXTEEN_SQUARES_DOUBLES);
    assertThat(median().computeInPlace(dataset)).isWithin(ALLOWED_ERROR).of(SIXTEEN_SQUARES_MEDIAN);