Add missing get_failures handler proxy implementation

This missing implementation prevented custom implementations
for the failure fetching logic in the handler classes
because Axes would not invoke them from them,
and would use the base handler class implementation instead.

axes/handlers/proxy.py

@@ -82,6 +82,11 @@ class AxesProxyHandler(AxesHandler):
         cls.update_request(request)
         return cls.get_implementation().is_allowed(request, credentials)
 
+    @classmethod
+    def get_failures(cls, request, credentials: dict = None) -> int:
+        cls.update_request(request)
+        return cls.get_implementation().get_failures(request, credentials)
+
     @classmethod
     @toggleable
     def user_login_failed(cls, sender, credentials: dict, request=None, **kwargs):

axes/tests/test_handlers.py

@@ -275,3 +275,18 @@ class AxesDummyHandlerTestCase(AxesHandlerBaseTestCase):
             self.login()
 
         self.check_login()
+
+
+@override_settings(AXES_HANDLER="axes.handlers.test.AxesTestHandler")
+class AxesTestHandlerTestCase(AxesHandlerBaseTestCase):
+    def test_handler_reset_attempts(self):
+        self.assertEqual(0, AxesProxyHandler.reset_attempts())
+
+    def test_handler_reset_logs(self):
+        self.assertEqual(0, AxesProxyHandler.reset_logs())
+
+    def test_handler_is_allowed(self):
+        self.assertEqual(True, AxesProxyHandler.is_allowed(self.request, {}))
+
+    def test_handler_get_failures(self):
+        self.assertEqual(0, AxesProxyHandler.get_failures(self.request, {}))