Fix wiring for @classmethod

docs/main/changelog.rst

@@ -7,6 +7,10 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Develop
+-----
+- Fix wiring for ``@classmethod``.
+
 4.1.5
 -----
 - Fix Travis CI windows and MacOS builds.

src/dependency_injector/wiring.py

@@ -158,7 +158,7 @@ def wire(
             if inspect.isfunction(member):
                 _patch_fn(module, name, member, providers_map)
             elif inspect.isclass(member):
-                for method_name, method in inspect.getmembers(member, inspect.isfunction):
+                for method_name, method in inspect.getmembers(member, _is_method):
                     _patch_fn(member, method_name, method, providers_map)
 
 
@@ -235,6 +235,10 @@ def _fetch_modules(package):
     return modules
 
 
+def _is_method(member):
+    return inspect.ismethod(member) or inspect.isfunction(member)
+
+
 def _patch_with_injections(fn, injections):
     if inspect.iscoroutinefunction(fn):
         @functools.wraps(fn)

tests/unit/samples/wiringsamples/module.py

@@ -17,6 +17,14 @@ class TestClass:
     def method(self, service: Service = Provide[Container.service]):
         return service
 
+    @classmethod
+    def class_method(cls, service: Service = Provide[Container.service]):
+        return service
+
+    @staticmethod
+    def static_method(service: Service = Provide[Container.service]):
+        return service
+
 
 def test_function(service: Service = Provide[Container.service]):
     return service

tests/unit/wiring/test_wiring_py36.py

@@ -61,6 +61,14 @@ class WiringTest(unittest.TestCase):
         service = test_class_object.method()
         self.assertIsInstance(service, Service)
 
+    def test_class_classmethod_wiring(self):
+        service = module.TestClass.class_method()
+        self.assertIsInstance(service, Service)
+
+    def test_class_staticmethod_wiring(self):
+        service = module.TestClass.static_method()
+        self.assertIsInstance(service, Service)
+
     def test_function_wiring(self):
         service = module.test_function()
         self.assertIsInstance(service, Service)