Refactor class to use protocol

Shared/Logging/Logging.swift

@@ -7,16 +7,26 @@
 
 import Foundation
 import os
+import OSLog
+
+protocol LogWriter {
+    func log(_ message: String, withSensitiveInfo privateInfo: String?, level: OSLogType)
+    func logCrashAndSetFlag(error: Error)
+}
 
 final class Logging {
 
     private let logger: Logger
     private let subsystem = Bundle.main.bundleIdentifier!
 
-    init(for category: String) {
+    init(for category: String = "") {
         self.logger = Logger(subsystem: subsystem, category: category)
     }
 
+}
+
+extension Logging: LogWriter {
+
     func log(
         _ message: String,
         withSensitiveInfo privateInfo: String? = nil,
@@ -33,7 +43,7 @@ final class Logging {
         let errorDescription = error.localizedDescription
         UserDefaults.shared.set(true, forKey: WFDefaults.didHaveFatalError)
         UserDefaults.shared.set(errorDescription, forKey: WFDefaults.fatalErrorDescription)
-        logger.critical("\(errorDescription)")
+        logger.log(level: .error, "\(errorDescription)")
         fatalError(errorDescription)
     }