From 9a8c76fc2b5f7f0664a7487063bd8f3244fccb7c Mon Sep 17 00:00:00 2001
From: Bibo-Joshi <22366557+Bibo-Joshi@users.noreply.github.com>
Date: Fri, 31 Dec 2021 16:04:21 +0100
Subject: [PATCH] Improve Error Messages in CommandHandler.__init__ (#2837)

---
 telegram/ext/_commandhandler.py | 2 +-
 tests/test_commandhandler.py    | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/telegram/ext/_commandhandler.py b/telegram/ext/_commandhandler.py
index 02cf6152d..5a762ba80 100644
--- a/telegram/ext/_commandhandler.py
+++ b/telegram/ext/_commandhandler.py
@@ -97,7 +97,7 @@ class CommandHandler(Handler[Update, CCT]):
             self.command = [x.lower() for x in command]
         for comm in self.command:
             if not re.match(r'^[\da-z_]{1,32}$', comm):
-                raise ValueError('Command is not a valid bot command')
+                raise ValueError(f'Command `{comm}` is not a valid bot command')
 
         self.filters = filters if filters is not None else filters_module.UpdateType.MESSAGES
 
diff --git a/tests/test_commandhandler.py b/tests/test_commandhandler.py
index 5dbf8005b..d2622e892 100644
--- a/tests/test_commandhandler.py
+++ b/tests/test_commandhandler.py
@@ -173,7 +173,9 @@ class TestCommandHandler(BaseTest):
         ids=['too long', 'invalid letter', 'invalid characters'],
     )
     def test_invalid_commands(self, cmd):
-        with pytest.raises(ValueError, match='not a valid bot command'):
+        with pytest.raises(
+            ValueError, match=f'`{re.escape(cmd.lower())}` is not a valid bot command'
+        ):
             CommandHandler(cmd, self.callback_basic)
 
     def test_command_list(self):