assertFailsWith<IllegalArgumentException> {
      OkHttpClient
        .Builder()
        .protocols(Arrays.asList(Protocol.HTTP_2))
    }
  }

  @Test
  fun setProtocolsWithNull() {
    assertFailsWith<IllegalArgumentException> {
      OkHttpClient
        .Builder()
        .protocols(Arrays.asList(Protocol.HTTP_1_1, null))
    }
  }

  @Test