diff --git a/azure/functions/decorators/function_app.py b/azure/functions/decorators/function_app.py
index a7160870..f2af63e7 100644
--- a/azure/functions/decorators/function_app.py
+++ b/azure/functions/decorators/function_app.py
@@ -3313,7 +3313,13 @@ class Blueprint(TriggerApi, BindingApi, SettingsApi):
     pass
 
 
-class ExternalHttpFunctionApp(FunctionRegister, TriggerApi, ABC):
+class ExternalHttpFunctionApp(
+    FunctionRegister,
+    TriggerApi,
+    SettingsApi,
+    BindingApi,
+    ABC
+):
     """Interface to extend for building third party http function apps."""
 
     @abc.abstractmethod
diff --git a/tests/decorators/test_function_app.py b/tests/decorators/test_function_app.py
index 2f687262..c85b5dfd 100644
--- a/tests/decorators/test_function_app.py
+++ b/tests/decorators/test_function_app.py
@@ -1,5 +1,6 @@
 #  Copyright (c) Microsoft Corporation. All rights reserved.
 #  Licensed under the MIT License.
+from abc import ABC
 import inspect
 import json
 import unittest
@@ -11,10 +12,12 @@
     TIMER_TRIGGER
 from azure.functions.decorators.core import DataType, AuthLevel, \
     BindingDirection, SCRIPT_FILE_NAME
-from azure.functions.decorators.function_app import BindingApi, \
-    FunctionBuilder, FunctionApp, Function, Blueprint, DecoratorApi, \
-    AsgiFunctionApp, WsgiFunctionApp, HttpFunctionsAuthLevelMixin, \
-    FunctionRegister, TriggerApi, ExternalHttpFunctionApp
+from azure.functions.decorators.function_app import (
+    BindingApi, FunctionBuilder, FunctionApp, Function, Blueprint,
+    DecoratorApi, AsgiFunctionApp, SettingsApi, WsgiFunctionApp,
+    HttpFunctionsAuthLevelMixin, FunctionRegister, TriggerApi,
+    ExternalHttpFunctionApp
+)
 from azure.functions.decorators.http import HttpTrigger, HttpOutput, \
     HttpMethod
 from azure.functions.decorators.retry_policy import RetryPolicy
@@ -322,6 +325,15 @@ def test_add_wsgi(self, add_http_app_mock):
         self.assertIsInstance(add_http_app_mock.call_args[0][0],
                               WsgiMiddleware)
 
+    def test_extends_required_classes(self):
+        self.assertTrue(issubclass(ExternalHttpFunctionApp, FunctionRegister))
+        self.assertTrue(issubclass(ExternalHttpFunctionApp, TriggerApi))
+        self.assertTrue(issubclass(ExternalHttpFunctionApp, SettingsApi))
+        self.assertTrue(issubclass(ExternalHttpFunctionApp, BindingApi))
+        self.assertTrue(issubclass(ExternalHttpFunctionApp, ABC))
+        self.assertTrue(issubclass(AsgiFunctionApp, ExternalHttpFunctionApp))
+        self.assertTrue(issubclass(WsgiFunctionApp, ExternalHttpFunctionApp))
+
     def test_add_asgi_app(self):
         self._test_http_external_app(AsgiFunctionApp(app=object()), True)
 
diff --git a/tests/test_http.py b/tests/test_http.py
index f6dfab07..1efa82bd 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -181,9 +181,10 @@ def test_http_response_does_not_have_explicit_output(self):
 
     def test_http_response_accepts_http_enums(self):
         response = func.HttpResponse(status_code=404)
-        self.assertEquals(response.status_code, 404)
+        self.assertEqual(response.status_code, 404)
+
         response = func.HttpResponse(status_code=HTTPStatus.ACCEPTED)
-        self.assertEquals(response.status_code, 202)
+        self.assertEqual(response.status_code, HTTPStatus.ACCEPTED.value)
 
     def test_http_request_converter_decode(self):
         data = {