Ensure group is passed when binding commands (#171)

Author: JamesOHeaDLS

src/fastcs/cs_methods.py

@@ -161,7 +161,7 @@ def _validate(self, fn: UnboundCommandCallback[Controller_T]) -> None:
             raise FastCSException("Command method cannot have arguments")
 
     def bind(self, controller: Controller_T) -> Command:
-        return Command(MethodType(self.fn, controller))
+        return Command(MethodType(self.fn, controller), group=self.group)
 
     def __call__(self):
         raise method_not_bound_error

tests/test_cs_methods.py

@@ -45,7 +45,7 @@ async def do_nothing(self):
         async def do_nothing_with_arg(self, arg):
             pass
 
-    unbound_command = UnboundCommand(TestController.do_nothing)
+    unbound_command = UnboundCommand(TestController.do_nothing, group="Test")
 
     with pytest.raises(NotImplementedError):
         await unbound_command()
@@ -57,6 +57,8 @@ async def do_nothing_with_arg(self, arg):
         Command(TestController().do_nothing_with_arg)  # type: ignore
 
     command = unbound_command.bind(TestController())
+    # Test that group is passed when binding commands
+    assert command.group == "Test"
 
     await command()