Save automatically, improve mocks

CHDataManagement/Model/Tag.swift

@@ -13,6 +13,8 @@ class Tag: Item, LocalizedItem {
     @Published
     var english: LocalizedTag
 
+    var savedData: Data?
+
     override init(content: Content, id: String) {
         self.isVisible = true
         self.english = .init(content: content, urlComponent: id, name: id)
@@ -77,7 +79,7 @@ class Tag: Item, LocalizedItem {
 
 // MARK: Storage
 
-extension Tag {
+extension Tag: StorageItem {
 
     convenience init(context: LoadingContext, id: String, data: Data) {
         self.init(
@@ -86,9 +88,10 @@ extension Tag {
             isVisible: data.isVisible ?? true,
             german: .init(context: context, data: data.german),
             english: .init(context: context, data: data.english))
+        savedData = data
     }
 
-    struct Data: Codable {
+    struct Data: Codable, Equatable {
         // Defaults to true if unset
         let isVisible: Bool?
         let german: LocalizedTag.Data
@@ -101,4 +104,8 @@ extension Tag {
             german: german.data,
             english: english.data)
     }
+
+    func saveToDisk(_ data: Data) -> Bool {
+        content.storage.save(tag: data, for: id)
+    }
 }