Use associated enum for the key information

Source/Shared/Storage/HybridStorage.swift

@@ -27,25 +27,25 @@ extension HybridStorage: StorageAware {
   public func removeObject(forKey key: String) throws {
     memoryStorage.removeObject(forKey: key)
     try diskStorage.removeObject(forKey: key)
-    storageObservationRegistry.notifyObservers(about: .singleDeletion, in: self)
+    storageObservationRegistry.notifyObservers(about: .remove(key: key), in: self)
   }
 
   public func setObject(_ object: T, forKey key: String, expiry: Expiry? = nil) throws {
     memoryStorage.setObject(object, forKey: key, expiry: expiry)
     try diskStorage.setObject(object, forKey: key, expiry: expiry)
-    storageObservationRegistry.notifyObservers(about: .addition, in: self)
+    storageObservationRegistry.notifyObservers(about: .add(key: key), in: self)
   }
 
   public func removeAll() throws {
     memoryStorage.removeAll()
     try diskStorage.removeAll()
-    storageObservationRegistry.notifyObservers(about: .allDeletion, in: self)
+    storageObservationRegistry.notifyObservers(about: .removeAll, in: self)
   }
 
   public func removeExpiredObjects() throws {
     memoryStorage.removeExpiredObjects()
     try diskStorage.removeExpiredObjects()
-    storageObservationRegistry.notifyObservers(about: .expiredDeletion, in: self)
+    storageObservationRegistry.notifyObservers(about: .removeExpired, in: self)
   }
 }
 

Source/Shared/Storage/StoreChange.swift

@@ -1,6 +1,17 @@
-public enum StorageChange {
-  case addition
-  case singleDeletion
-  case allDeletion
-  case expiredDeletion
+public enum StorageChange: Equatable {
+  case add(key: String)
+  case remove(key: String)
+  case removeAll
+  case removeExpired
+}
+
+public func == (lhs: StorageChange, rhs: StorageChange) -> Bool {
+  switch (lhs, rhs) {
+  case (.add(let key1), .add(let key2)), (.remove(let key1), .remove(let key2)):
+    return key1 == key2
+  case (.removeAll, .removeAll), (.removeExpired, .removeExpired):
+    return true
+  default:
+    return false
+  }
 }

Tests/iOS/Tests/Storage/HybridStorageTests.swift

@@ -170,6 +170,14 @@ final class HybridStorageTests: XCTestCase {
     try storage.removeExpiredObjects()
     try storage.removeAll()
 
-    XCTAssertEqual(changes, [.addition, .addition, .singleDeletion, .expiredDeletion, .allDeletion])
+    let expectedChanges: [StorageChange] = [
+      .add(key: "user1"),
+      .add(key: "user2"),
+      .remove(key: "user1"),
+      .removeExpired,
+      .removeAll
+    ]
+
+    XCTAssertEqual(changes, expectedChanges)
   }
 }

Tests/iOS/Tests/Storage/StorageObservationRegistryTests.swift

@@ -52,9 +52,9 @@ final class StorageObservationRegistryTests: XCTestCase {
       change2 = change
     }
 
-    registry.notifyObservers(about: .addition, in: storage)
+    registry.notifyObservers(about: .add(key: "key"), in: storage)
 
-    XCTAssertEqual(change1, .addition)
-    XCTAssertEqual(change2, .addition)
+    XCTAssertEqual(change1, StorageChange.add(key: "key"))
+    XCTAssertEqual(change2, StorageChange.add(key: "key"))
   }
 }

Tests/iOS/Tests/Storage/StorageTests.swift

@@ -110,6 +110,14 @@ final class StorageTests: XCTestCase {
     try storage.removeExpiredObjects()
     try storage.removeAll()
 
-    XCTAssertEqual(changes, [.addition, .addition, .singleDeletion, .expiredDeletion, .allDeletion])
+    let expectedChanges: [StorageChange] = [
+      .add(key: "user1"),
+      .add(key: "user2"),
+      .remove(key: "user1"),
+      .removeExpired,
+      .removeAll
+    ]
+
+    XCTAssertEqual(changes, expectedChanges)
   }
 }