Externalize NWBrowser dependency in PrinterRequestManager into protocol for testing

SoyuzTests/PrinterRequestsManagerTests.swift

@@ -0,0 +1,24 @@
+//
+//  PrinterRequestsManagerTests.swift
+//  SoyuzTests
+//
+//  Created by maddiefuzz on 2/21/23.
+//
+
+import XCTest
+@testable import Soyuz
+
+class FileHandleMock: FileHandle {
+    override func write(_ data: Data) {
+        return
+    }
+}
+
+class PrinterRequestManagerTests: XCTestCase {
+    var printerRequestsManager: PrinterRequestManager?
+    
+    override func setUp() {
+        printerRequestsManager = PrinterRequestManager.shared
+    }
+    
+}