fix(admin): accept /stats with bot mention

tests/test_admin_stats.py

@@ -0,0 +1,27 @@
+import re
+import unittest
+
+from bot import STATS_COMMAND_PATTERN
+
+
+class StatsCommandPatternTests(unittest.TestCase):
+    def test_matches_plain_and_mentioned_forms(self):
+        # В группе команду часто отправляют с явным обращением к боту.
+        for text in ("/stats", "/stats@pisatel_posts_bot", "/stats all", "/stats@pisatel_posts_bot week"):
+            with self.subTest(text=text):
+                self.assertIsNotNone(re.match(STATS_COMMAND_PATTERN, text))
+
+    def test_rejects_unknown_arguments(self):
+        for text in ("/stats yearly", "/stats@bot unknown", "stats", "/statsical"):
+            with self.subTest(text=text):
+                self.assertIsNone(re.match(STATS_COMMAND_PATTERN, text))
+
+    def test_period_argument_is_extractable(self):
+        match = re.match(STATS_COMMAND_PATTERN, "/stats@pisatel_posts_bot month")
+        self.assertIsNotNone(match)
+        assert match is not None
+        self.assertEqual(match.group(1), "month")
+
+
+if __name__ == "__main__":
+    unittest.main()