boundary = "simple boundary",
        source = Buffer().writeUtf8(multipart),
      )

    parts.nextPart()!!
    val partMno = parts.nextPart()!!
    assertThat(partMno.body.readUtf8()).isEqualTo("mnop")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `cannot read part after calling nextPart`() {
    val multipart =
      """
      |--simple boundary
      |
      |abcd
      |efgh

 * until [nextPart] returns null. After calling [nextPart] any preceding parts should not be read.
 *
 * Typical use loops over the parts in sequence:
 *
 * ```kotlin
 * val response: Response = call.execute()
 * val multipartReader = MultipartReader(response.body!!)
 *
 * multipartReader.use {
 *   while (true) {
 *     val part = multipartReader.nextPart() ?: break
 *     process(part.headers, part.body)

    ```kotlin
    val response: Response = call.execute()
    val multipartReader = MultipartReader(response.body!!)

    multipartReader.use {
      while (true) {
        val part = multipartReader.nextPart() ?: break
        process(part.headers, part.body)
      }
    }
    ```

 *  New: `MediaType.parameter()` gets a parameter like `boundary` from a media type like
    `multipart/mixed; boundary="abc"`.

	public fun <init> (Lokhttp3/ResponseBody;)V
	public fun <init> (Lokio/BufferedSource;Ljava/lang/String;)V
	public final fun boundary ()Ljava/lang/String;
	public fun close ()V
	public final fun nextPart ()Lokhttp3/MultipartReader$Part;
}

public final class okhttp3/MultipartReader$Part : java/io/Closeable {
	public fun <init> (Lokhttp3/Headers;Lokio/BufferedSource;)V
	public final fun body ()Lokio/BufferedSource;

		maxMemoryBytes := 2 * int64(10<<20)
		maxMemoryBytes -= int64(len(name))
		maxMemoryBytes -= mapEntryOverhead
		if maxMemoryBytes < 0 {
			// We can't actually take this path, since nextPart would already have
			// rejected the MIME headers for being too large. Check anyway.
			apiErr := errorCodes.ToAPIErr(ErrMalformedPOSTRequest)

	public fun <init> (Lokhttp3/ResponseBody;)V
	public fun <init> (Lokio/BufferedSource;Ljava/lang/String;)V
	public final fun boundary ()Ljava/lang/String;
	public fun close ()V
	public final fun nextPart ()Lokhttp3/MultipartReader$Part;
}

public final class okhttp3/MultipartReader$Part : java/io/Closeable {
	public fun <init> (Lokhttp3/Headers;Lokio/BufferedSource;)V
	public final fun body ()Lokio/BufferedSource;

pkg mime/multipart, method (*Part) FileName() string
pkg mime/multipart, method (*Part) FormName() string
pkg mime/multipart, method (*Part) Read([]uint8) (int, error)
pkg mime/multipart, method (*Reader) NextPart() (*Part, error)
pkg mime/multipart, method (*Reader) ReadForm(int64) (*Form, error)
pkg mime/multipart, method (*Writer) Boundary() string
pkg mime/multipart, method (*Writer) Close() error