Repeat a test till it fails. This can be used to help troubleshoot tests with intermittent failures and to grow confidence in the code being tested or the test itself, being fixed

TestRepeater.swift

#!/usr/bin/swift

import Foundation

class TestRepeater {
	func runTest() {
		let result = shell("/usr/bin/xcodebuild", [
			"-project", "PSKit.xcodeproj",
			"-scheme", "PSKit",
			"test-without-building",
			"-only-testing:PSKitTests/CommonModelSingletonRequestStoreTests/testGetPublishWhenOpCompletes_twoOps",
			"-destination", "platform=iOS Simulator,name=iPhone XR",
		])

		let stringResult = String(describing: result)

		if stringResult.contains("TEST EXECUTE SUCCEEDED") {
			runTest()
		} else {
			print(stringResult)
		}
	}

	func shell(_ launchPath: String, _ arguments: [String]) -> String? {
    	let task = Process()
    	task.launchPath = launchPath
    	task.arguments = arguments

    	let pipe = Pipe()
    	task.standardOutput = pipe
    	task.launch()

    	let data = pipe.fileHandleForReading.readDataToEndOfFile()
    	let output = String(data: data, encoding: .utf8)

    	return output
	}
}

let testRepeater = TestRepeater()
testRepeater.runTest()