diff --git a/tests/test_standalone.py b/tests/test_standalone.py
index f630bb44..cc55548d 100644
--- a/tests/test_standalone.py
+++ b/tests/test_standalone.py
@@ -1,10 +1,11 @@
+import logging
 import sys
 from pathlib import Path
 
 import pytest
 from tornado import testing
 
-from jupyter_server_proxy.standalone import _default_address_and_port, make_proxy_app
+from jupyter_server_proxy.standalone import StandaloneProxyServer
 
 """
 Test if address and port are identified correctly
@@ -13,60 +14,62 @@
 
 def test_address_and_port_with_http_address(monkeypatch):
     monkeypatch.setenv("JUPYTERHUB_SERVICE_URL", "http://localhost/")
-    address, port = _default_address_and_port()
+    proxy_server = StandaloneProxyServer()
 
-    assert address == "localhost"
-    assert port == 80
+    assert proxy_server.address == "localhost"
+    assert proxy_server.port == 80
 
 
 def test_address_and_port_with_https_address(monkeypatch):
     monkeypatch.setenv("JUPYTERHUB_SERVICE_URL", "https://localhost/")
-    address, port = _default_address_and_port()
+    proxy_server = StandaloneProxyServer()
 
-    assert address == "localhost"
-    assert port == 443
+    assert proxy_server.address == "localhost"
+    assert proxy_server.port == 443
 
 
 def test_address_and_port_with_address_and_port(monkeypatch):
     monkeypatch.setenv("JUPYTERHUB_SERVICE_URL", "http://localhost:7777/")
-    address, port = _default_address_and_port()
-
-    assert address == "localhost"
-    assert port == 7777
-
-
-def make_app(unix_socket: bool, skip_authentication: bool):
-    command = [
-        sys.executable,
-        str(Path(__file__).parent / "resources" / "httpinfo.py"),
-        "--port={port}",
-        "--unix-socket={unix_socket}",
-    ]
-
-    return make_proxy_app(
-        command=command,
-        prefix="/some/prefix",
-        port=0,
-        unix_socket=unix_socket,
-        environment={},
-        mappath={},
-        timeout=60,
-        skip_authentication=skip_authentication,
-        debug=True,
-        websocket_max_message_size=0,
-    )
-
-
-class TestStandaloneProxyRedirect(testing.AsyncHTTPTestCase):
+    proxy_server = StandaloneProxyServer()
+
+    assert proxy_server.address == "localhost"
+    assert proxy_server.port == 7777
+
+
+class _TestStandaloneBase(testing.AsyncHTTPTestCase):
+    runTest = None  # Required for Tornado 6.1
+
+    unix_socket: bool
+    skip_authentication: bool
+
+    def get_app(self):
+        command = [
+            sys.executable,
+            str(Path(__file__).parent / "resources" / "httpinfo.py"),
+            "--port={port}",
+            "--unix-socket={unix_socket}",
+        ]
+
+        proxy_server = StandaloneProxyServer(
+            command=command,
+            base_url="/some/prefix",
+            unix_socket=self.unix_socket,
+            timeout=60,
+            skip_authentication=self.skip_authentication,
+            log_level=logging.DEBUG,
+        )
+
+        return proxy_server.create_app()
+
+
+class TestStandaloneProxyRedirect(_TestStandaloneBase):
     """
     Ensure requests are proxied to the application. We need to disable authentication here,
     as we do not want to be redirected to the JupyterHub Login.
     """
 
-    runTest = None  # Required for Tornado 6.1
-
-    def get_app(self):
-        return make_app(False, True)
+    unix_socket = False
+    skip_authentication = True
 
     def test_add_slash(self):
         response = self.fetch("/some/prefix", follow_redirects=False)
@@ -74,7 +77,7 @@ def test_add_slash(self):
         assert response.code == 301
         assert response.headers.get("Location") == "/some/prefix/"
 
-    def test_without_prefix(self):
+    def test_wrong_prefix(self):
         response = self.fetch("/some/other/prefix")
 
         assert response.code == 404
@@ -92,11 +95,9 @@ def test_on_prefix(self):
 @pytest.mark.skipif(
     sys.platform == "win32", reason="Unix socket not supported on Windows"
 )
-class TestStandaloneProxyWithUnixSocket(testing.AsyncHTTPTestCase):
-    runTest = None  # Required for Tornado 6.1
-
-    def get_app(self):
-        return make_app(True, True)
+class TestStandaloneProxyWithUnixSocket(_TestStandaloneBase):
+    unix_socket = True
+    skip_authentication = True
 
     def test_with_unix_socket(self):
         response = self.fetch("/some/prefix/")
@@ -108,15 +109,13 @@ def test_with_unix_socket(self):
         assert "X-Proxycontextpath: /some/prefix/" in body
 
 
-class TestStandaloneProxyLogin(testing.AsyncHTTPTestCase):
+class TestStandaloneProxyLogin(_TestStandaloneBase):
     """
     Ensure we redirect to JupyterHub login when authentication is enabled
     """
 
-    runTest = None  # Required for Tornado 6.1
-
-    def get_app(self):
-        return make_app(False, False)
+    unix_socket = False
+    skip_authentication = False
 
     def test_redirect_to_login_url(self):
         response = self.fetch("/some/prefix/", follow_redirects=False)