Can't run tests with Xcode 10.0

[mihmonah]

After installing new beta macOS Mojave (10.14 Beta) and Xcode Version 10.0 beta 3 (10L201y) for trying -parallel-testing-enabled flag pytest gives the next output:

E selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Xcode version '0.0'. Support for Xcode 0.0 is not supported. Please upgrade to version 7.3 or higher

I think it could be related to this issue, but I don't know how appium-xcode repo is correlated with python-client repo.
My current version of Appium Python Client is from today master (commit 97cf837abe308044242bfd9950f2cbd5a48c7daf)

[KazuCocoa]

What Appium server did you use?
Did you try out appium@beta?

[imurchie]

This is an issue with the Appium server. You need to install the latest beta (npm uninstall -g appium && npm install -g appium@beta) since the release came out before Xcode 10.

[mihmonah]

@imurchie thanks for your comment, it was useful advice!

But after building app with command
xcodebuild -workspace $WORKSPACE -scheme $SCHEME -configuration AdHoc -derivedDataPath $DERIVEDIR -sdk iphonesimulator12.0 -destination "id=$UDID" clean build -parallel-testing-enabled YES -maximum-concurrent-test-simulator-destinations 2 -parallel-testing-worker-count 2
another error appears:

ios_tests/tests/test_send_message.py::test_send_message [XCUITest] Error: Command 'osascript -e 'tell application "System Events" to count processes whose bundle identifier is "com.apple.iphonesimulator"'' exited with code 1
[XCUITest] at ChildProcess.<anonymous> (/Users/mikhailmonakhov/.nvm/versions/node/v8.11.1/lib/node_modules/appium/node_modules/teen_process/lib/exec.js:94:19) [XCUITest] at emitTwo (events.js:126:13) [XCUITest] at ChildProcess.emit (events.js:214:7) [XCUITest] at maybeClose (internal/child_process.js:925:16) [XCUITest] at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5) [MJSONWP] Encountered internal error running command: Error: Command 'osascript -e 'tell application "System Events" to count processes whose bundle identifier is "com.apple.iphonesimulator"'' exited with code 1
[MJSONWP] at ChildProcess.<anonymous> (/Users/mikhailmonakhov/.nvm/versions/node/v8.11.1/lib/node_modules/appium/node_modules/teen_process/lib/exec.js:94:19) [MJSONWP] at emitTwo (events.js:126:13) [MJSONWP] at ChildProcess.emit (events.js:214:7) [MJSONWP] at maybeClose (internal/child_process.js:925:16) [MJSONWP] at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5) ERROR

But I updated bundle ID in updatedWDABundleId='{}'.format(MYBANDLEID) of desired_capabilities for driver.
May be for parallel execution of tests via new Xcode some new options of desired_capabilities variable are needed (like for xcodebuild command)?

[imurchie]

This is a server problem. Please create an issue, with all required information, in the server repository: https://github.com/appium/appium/issues/new

[mihmonah]

@imurchie thanks for answer!