Tests. Let's start.

tests/test_message.py

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+import datetime
+import unittest
+
+from aiogram import types
+from dataset import MESSAGE
+
+
+class TestMessage(unittest.TestCase):
+    def setUp(self):
+        self.message = types.Message(**MESSAGE)
+
+    def test_update_id(self):
+        self.assertEqual(self.message.message_id, MESSAGE['message_id'], 'test')
+        self.assertEqual(self.message['message_id'], MESSAGE['message_id'])
+
+    def test_from(self):
+        self.assertIsInstance(self.message.from_user, types.User)
+        self.assertEqual(self.message.from_user, self.message['from'])
+
+    def test_chat(self):
+        self.assertIsInstance(self.message.chat, types.Chat)
+        self.assertEqual(self.message.chat, self.message['chat'])
+
+    def test_date(self):
+        self.assertIsInstance(self.message.date, datetime.datetime)
+        self.assertEqual(int(self.message.date.timestamp()), MESSAGE['date'])
+        self.assertEqual(self.message.date, self.message['date'])
+
+    def test_text(self):
+        self.assertEqual(self.message.text, MESSAGE['text'])
+        self.assertEqual(self.message['text'], MESSAGE['text'])
+
+
+if __name__ == '__main__':
+    unittest.main()