Save automatically, improve mocks

CHDataManagement/Model/StorageError.swift

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+import Foundation
+
+struct StorageError {
+
+    let date: Date
+
+    let message: String
+
+    init(date: Date = .now, message: String) {
+        self.date = date
+        self.message = message
+    }
+}
+
+extension StorageError: Identifiable {
+
+    var id: String {
+        date.description + message
+    }
+}
+
+extension StorageError: Comparable {
+
+    static func < (lhs: StorageError, rhs: StorageError) -> Bool {
+        guard lhs.date == rhs.date else {
+            return lhs.date < rhs.date
+        }
+        return lhs.message < rhs.message
+    }
+}
+
+extension StorageError: ExpressibleByStringLiteral {
+
+    init(stringLiteral value: StringLiteralType) {
+        self.init(message: value)
+    }
+}