feat: Add == operator to the Receipt, User and Room objects

lib/src/room.dart

@@ -1730,4 +1730,7 @@ class Room {
   TombstoneContent get extinctInformations => isExtinct
       ? getState(EventTypes.RoomTombstone).parsedTombstoneContent
       : null;
+
+  @override
+  bool operator ==(dynamic other) => (other is Room && other.id == id);
 }

lib/src/user.dart

@@ -175,4 +175,10 @@ class User extends Event {
   /// Please be aware that you can only set the power level to at least your own!
   bool get canChangePowerLevel =>
       room.canChangePowerLevel && powerLevel < room.ownPowerLevel;
+
+  @override
+  bool operator ==(dynamic other) => (other is User &&
+      other.id == id &&
+      other.room == room &&
+      other.membership == membership);
 }

lib/src/utils/receipt.dart

@@ -7,4 +7,9 @@ class Receipt {
   final DateTime time;
 
   const Receipt(this.user, this.time);
+
+  @override
+  bool operator ==(dynamic other) => (other is Receipt &&
+      other.user == user &&
+      other.time.microsecondsSinceEpoch == time.microsecondsSinceEpoch);
 }

test/client_test.dart

@@ -453,6 +453,36 @@ void main() {
       await client.dispose(closeDatabase: true);
     });
 
+    test('object equality', () async {
+      final time1 = DateTime.fromMillisecondsSinceEpoch(1);
+      final time2 = DateTime.fromMillisecondsSinceEpoch(0);
+      final user1 = User('@user1:example.org', room: Room(id: '!room1'));
+      final user2 = User('@user2:example.org', room: Room(id: '!room1'));
+      // receipts
+      expect(Receipt(user1, time1) == Receipt(user1, time1), true);
+      expect(Receipt(user1, time1) == Receipt(user1, time2), false);
+      expect(Receipt(user1, time1) == Receipt(user2, time1), false);
+      // ignore: unrelated_type_equality_checks
+      expect(Receipt(user1, time1) == 'beep', false);
+      // users
+      expect(user1 == user1, true);
+      expect(user1 == user2, false);
+      expect(
+          user1 == User('@user1:example.org', room: Room(id: '!room2')), false);
+      expect(
+          user1 ==
+              User('@user1:example.org',
+                  room: Room(id: '!room1'), membership: 'leave'),
+          false);
+      // ignore: unrelated_type_equality_checks
+      expect(user1 == 'beep', false);
+      // rooms
+      expect(Room(id: '!room1') == Room(id: '!room1'), true);
+      expect(Room(id: '!room1') == Room(id: '!room2'), false);
+      // ignore: unrelated_type_equality_checks
+      expect(Room(id: '!room1') == 'beep', false);
+    });
+
     test('dispose', () async {
       await matrix.dispose(closeDatabase: true);
     });