authType: String,
    ) {
      calls.add("checkClientTrusted " + certificatesToString(chain))
    }

    override fun checkServerTrusted(
      chain: Array<X509Certificate>,
      authType: String,
    ) {
      calls.add("checkServerTrusted " + certificatesToString(chain))
    }

    private fun certificatesToString(certificates: Array<X509Certificate>): String {