.addPart("Hello, World!".toRequestBody(null))
        .build()
    assertThat(body.boundary).isEqualTo("123")
    assertThat(body.type).isEqualTo(MultipartBody.MIXED)
    assertThat(body.contentType().toString())
      .isEqualTo("multipart/mixed; boundary=123")
    assertThat(body.parts.size).isEqualTo(1)
    assertThat(body.contentLength()).isEqualTo(33L)
    val buffer = Buffer()
    body.writeTo(buffer)

    }


@app.get(
    "/mixed",
    response_model=Model3,
    response_model_include={"ref2", "name"},
    response_model_exclude={"ref2": {"baz"}},
)
def mixed():
    return Model3(
        name="mixed model3 name",
        age=3,
        ref2=Model2(
            ref=Model1(foo="mixed model foo", bar="mixed model bar"),
            baz="mixed model2 baz",
        ),
    )


@app.get(

      }
    }

  companion object {
    /**
     * The "mixed" subtype of "multipart" is intended for use when the body parts are independent
     * and need to be bundled in a particular order. Any "multipart" subtypes that an implementation
     * does not recognize must be treated as being of subtype "mixed".
     */
    @JvmField
    val MIXED = "multipart/mixed".toMediaType()

    /**

# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )

    JAVACMD=$( cygpath --unix "$JAVACMD" )

    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if

# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )

    JAVACMD=$( cygpath --unix "$JAVACMD" )

    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if

        "\nempty first line\nno newline at end", "\n", "empty first line\n", "no newline at end");
    bufferHelper("three\rlines\rno newline at end", "three\r", "lines\r", "no newline at end");
    bufferHelper("mixed\nline\rendings\r\n", "mixed\n", "line\r", "endings\r\n");
  }

  private static final int[] CHUNK_SIZES = {1, 2, 3, Integer.MAX_VALUE};

  private static void bufferHelper(String input, String... expect) throws IOException {

        "\nempty first line\nno newline at end", "\n", "empty first line\n", "no newline at end");
    bufferHelper("three\rlines\rno newline at end", "three\r", "lines\r", "no newline at end");
    bufferHelper("mixed\nline\rendings\r\n", "mixed\n", "line\r", "endings\r\n");
  }

  private static final int[] CHUNK_SIZES = {1, 2, 3, Integer.MAX_VALUE};

  private static void bufferHelper(String input, String... expect) throws IOException {

    assertEquals("plain", mediaType.subtype)
    assertNull(mediaType.charsetName())
    assertEquals("text/plain;", mediaType.toString())
  }

  @Test fun testParameter() {
    val mediaType = parse("multipart/mixed; boundary=\"abcd\"")
    assertEquals("abcd", mediaType.parameter("boundary"))
    assertEquals("abcd", mediaType.parameter("BOUNDARY"))
  }

  @Test fun testMultipleParameters() {

		{[]string{"d1", "http://localhost/d2", "d3", "d4"}, fmt.Errorf("mixed style endpoints are not supported")},
		{[]string{"http://example.org/d1", "https://example.com/d1", "http://example.net/d1", "https://example.edut/d1"}, fmt.Errorf("mixed scheme is not supported")},

   *     lower-case characters
   */
  public abstract BaseEncoding lowerCase();

  /**
   * Returns an encoding that behaves equivalently to this encoding, but decodes letters without
   * regard to case.
   *
   * @throws IllegalStateException if the alphabet used by this encoding contains mixed upper- and
   *     lower-case characters