when (val protocol = sslSocket.applicationProtocol) {
        null, "" -> null
        else -> protocol
      }
    } catch (e: UnsupportedOperationException) {
      // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html#getApplicationProtocol--
      null
    }
  }

    platform.assumeJdk9()
    val applicationProtocolUnsupported =
      object : DelegatingSSLSocket(null) {
        override fun getApplicationProtocol(): String {
          throw UnsupportedOperationException("Mock exception")
        }
      }
    assertThat(Jdk9Platform().getSelectedProtocol(applicationProtocolUnsupported)).isNull()
  }