}

  @Test fun ofMapRejectsNullCharInName() {
    assertFailsWith<IllegalArgumentException> {
      mapOf("User-\u0000Agent" to "OkHttp").toHeaders()
    }
  }

  @Test fun ofMapRejectsNullCharInValue() {
    assertFailsWith<IllegalArgumentException> {
      mapOf("User-Agent" to "Square\u0000OkHttp").toHeaders()
    }
  }

  @Test fun builderRejectsUnicodeInHeaderName() {