Make behave-django work with behave v1.2.7.dev3

Adds an input validation function for argparse to our codebase,
which was originally included in behave's codebase. See #147.

behave_django/management/commands/behave.py

@@ -1,10 +1,11 @@
 from __future__ import absolute_import
 
 import sys
+from argparse import ArgumentTypeError
+from importlib import import_module
 
 from behave.__main__ import main as behave_main
 from behave.configuration import options as behave_options
-from behave.configuration import valid_python_module
 from django.core.management.base import BaseCommand
 
 from behave_django.environment import monkey_patch_behave
@@ -15,6 +16,15 @@
 )
 
 
+def valid_python_module(path):
+    try:
+        module_path, class_name = path.rsplit('.', 1)
+        module = import_module(module_path)
+        return getattr(module, class_name)
+    except (ValueError, AttributeError, ImportError):
+        raise ArgumentTypeError("No module named '{path}' was found.")
+
+
 def add_command_arguments(parser):
     """
     Additional command line arguments for the behave management command

requirements.txt

@@ -1,3 +1,3 @@
 beautifulsoup4
-behave@git+http://github.com/behave/[email protected].dev2  # behave>=1.2.7
+behave[toml]@git+http://github.com/behave/[email protected].dev3  # behave>=1.2.7
 django>=3.2