"protocols containing h2_prior_knowledge cannot use other protocols: " +
          "[h2_prior_knowledge, http/1.1]",
      )
    }
  }

  @Test fun testH2PriorKnowledgeOkHttpClientConstructionDuplicates() {
    assertFailsWith<IllegalArgumentException> {
      OkHttpClient.Builder()
        .protocols(listOf(Protocol.H2_PRIOR_KNOWLEDGE, Protocol.H2_PRIOR_KNOWLEDGE))
    }.also { expected ->