Tests. Let's start.

tests/dataset.py

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+UPDATE = {
+    "update_id": 128526,
+    "message": {
+        "message_id": 11223,
+        "from": {
+            "id": 12345678,
+            "is_bot": False,
+            "first_name": "FirstName",
+            "last_name": "LastName",
+            "username": "username",
+            "language_code": "ru"
+        },
+        "chat": {
+            "id": 12345678,
+            "first_name": "FirstName",
+            "last_name": "LastName",
+            "username": "username",
+            "type": "private"
+        },
+        "date": 1508709711,
+        "text": "Hi, world!"
+    }
+}
+
+MESSAGE = UPDATE['message']

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()

tests/utils.py

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+def out(*message, sep=' '):
+    print('Test', sep.join(message))