👌 Read configuration from JSON file

This allows us to alter the configuration prior to launching the app,
which allows for additional flexibility during testing.

tests/Shared/XCPMApplication.swift

@@ -0,0 +1,23 @@
+//
+//  XCPMApplication.swift
+//  PHP Monitor
+//
+//  Created by Nico Verbruggen on 16/10/2022.
+//  Copyright © 2022 Nico Verbruggen. All rights reserved.
+//
+
+import XCTest
+
+class XCPMApplication: XCUIApplication {
+    public func withConfiguration(_ configuration: TestableConfiguration) {
+        let path = persistTestable(configuration)
+        self.launchArguments = ["--configuration:\(path)"]
+    }
+
+    private func persistTestable(_ configuration: TestableConfiguration) -> String {
+        let tempDirectoryURL = NSURL.fileURL(withPath: NSTemporaryDirectory(), isDirectory: true)
+        let targetURL = tempDirectoryURL.appendingPathComponent("\(UUID().uuidString).json")
+        try! configuration.toJson().write(toFile: targetURL.path, atomically: true, encoding: .utf8)
+        return targetURL.path
+    }
+}