Define create_module()/exec_module() in VendorImporter

Fixes #2481

changelog.d/2481.change.rst

@@ -0,0 +1,2 @@
+Define ``create_module()`` and ``exec_module()`` methods in ``VendorImporter``
+to get rid of ``ImportWarning`` -- by :user:`hroncok`

pkg_resources/extern/__init__.py

@@ -54,6 +54,12 @@ def load_module(self, fullname):
                 "distribution.".format(**locals())
             )
 
+    def create_module(self, spec):
+        return self.load_module(spec.name)
+
+    def exec_module(self, module):
+        pass
+
     def install(self):
         """
         Install this importer into sys.meta_path if not already present.

setuptools/extern/__init__.py

@@ -54,6 +54,12 @@ def load_module(self, fullname):
                 "distribution.".format(**locals())
             )
 
+    def create_module(self, spec):
+        return self.load_module(spec.name)
+
+    def exec_module(self, module):
+        pass
+
     def install(self):
         """
         Install this importer into sys.meta_path if not already present.

tox.ini

@@ -7,6 +7,9 @@ toxworkdir={env:TOX_WORK_DIR:.tox}
 
 [testenv]
 deps =
+	pytest
+	jaraco-envs
+	pytest-fixture-config
 commands =
 	pytest {posargs}
 usedevelop = True