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      has been advised of the possibility of such damages.

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 *
 * <p><b>Warning:</b> as with any sorted collection, you are strongly advised not to use a {@link
 * Comparator} or {@link Comparable} type whose comparison behavior is <i>inconsistent with
 * equals</i>. That is, {@code a.compareTo(b)} or {@code comparator.compare(a, b)} should equal zero
 * <i>if and only if</i> {@code a.equals(b)}. If this advice is not followed, the resulting
 * collection will not correctly obey its specification.
 *

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    assertFailsWith<ProtocolException> {
      parts.nextPart()
    }.also { expected ->
      assertThat(expected).hasMessage("unexpected characters after boundary")
    }
  }

  /** The documentation advises that '-' is the simplest boundary possible. */
  @Test fun `dash boundary`() {
    val multipart =
      """
      |---
      |Content-ID: abc
      |
      |abcd
      |---
      |Content-ID: efg

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