How can I launch WireMock for XCTest UI tests under Xcode 10 and macOS 10.14?

We are using a standalone wiremock instance as a mock server for our Xcode UI tests. We have an test observer class which is responsible for spinning up this instance (if required) and tearing it down upon completion of the test run. The code for the observer is as follows:

import AppKit
import XCTest
import WiremockClient

class SSUITestObserver: NSObject, XCTestObservation {

    enum TestObserverError : Error {
        case MockServerStartupError(String)
    }

    lazy var testBundleURL: URL = Bundle(for: SSUITestCase.self).bundleURL
    lazy var testBundleBinURL: URL = self.testBundleURL.appendingPathComponent("..", isDirectory: true)
    lazy var mockServerHomeURL: URL = self.testBundleURL.appendingPathComponent("Contents/Resources/", isDirectory: true)
    lazy var mockServerJarURL: URL = self.mockServerHomeURL.appendingPathComponent("wiremock-standalone-2.18.0.jar", isDirectory: false)

    override init() {
        super.init()

        NSLog("UI Test Observer Initialized")
        XCTestObservationCenter.shared.addTestObserver(self)
    }

    func testBundleWillStart(_ testBundle: Bundle) {
        NSLog("***Test Bundle starting")
        do {
            // Start the Wiremock server
            try ensureMockServerIsRunning()
        } catch {
            fatalError("\n Failed during test bundle setup: \(error)\n")
        }


    }

    public func testBundleDidFinish(_ testBundle: Bundle) {
        NSLog("***Test Bundle completed")
        stopMockServer()
    }

    func ensureMockServerIsRunning() throws {
        WiremockClient.baseURL = SSUIIntegrationTestCase.mockServerAddress

        guard !WiremockClient.isServerRunning() else { return }

        let args = ["-jar",
                    self.mockServerJarURL.path,
                    "--port", "3000",
                    "--root-dir", self.mockServerHomeURL.path]

        _ = Process.launchedProcess(launchPath: "/usr/bin/java", arguments: args)

        for _ in 1...9 {
            if WiremockClient.isServerRunning() { return }
            sleep(1)
        }

        throw TestObserverError.MockServerStartupError("Error staring up the mock server instance!")
    }

    func stopMockServer() {
        WiremockClient.shutdownServer()
    }

    func resetMockServerStubs() {
        WiremockClient.reset()
    }
}

All was well until I moved to macOS 10.14. Formerly, we were not code signing the UITest target. Upon moving to 10.14, running tests now fails with a bootstrap error before the tests even begin to run. I discovered that turning on automatic code-signing for on the tests gets around this problem.

ただし、これにより2番目の問題が発生します。launchedProcess上記の行で、ワイヤーモックサーバーを起動しようとすると失敗しjava.lang.RuntimeException: java.net.SocketException: Operation not permittedます。テストを実行する前にサーバーを（コマンドラインなどで）起動すると、すべて正常に動作します。

では、どうすればこのキャッチ22から抜け出すことができますか？10.13ではすべてがうまく機能しました。コード署名がモックサーバーの起動と何の関係があるのか​​は私にはわかりません。