diff --git a/jupyter_server/base/handlers.py b/jupyter_server/base/handlers.py
index 4bf26df177..945a3096e5 100644
--- a/jupyter_server/base/handlers.py
+++ b/jupyter_server/base/handlers.py
@@ -67,6 +67,10 @@ def log():
 class AuthenticatedHandler(web.RequestHandler):
     """A RequestHandler with an authenticated user."""
 
+    @property
+    def base_url(self) -> str:
+        return self.settings.get("base_url", "/")
+
     @property
     def content_security_policy(self):
         """The default Content-Security-Policy header
@@ -288,10 +292,6 @@ def mathjax_url(self):
     def mathjax_config(self):
         return self.settings.get("mathjax_config", "TeX-AMS-MML_HTMLorMML-full,Safe")
 
-    @property
-    def base_url(self) -> str:
-        return self.settings.get("base_url", "/")
-
     @property
     def default_url(self):
         return self.settings.get("default_url", "")
@@ -830,12 +830,12 @@ def head(self, path):
 
     @web.authenticated
     @authorized
-    def get(self, path):
+    def get(self, path, **kwargs):
         if os.path.splitext(path)[1] == ".ipynb" or self.get_argument("download", None):
             name = path.rsplit("/", 1)[-1]
             self.set_attachment_header(name)
 
-        return web.StaticFileHandler.get(self, path)
+        return web.StaticFileHandler.get(self, path, **kwargs)
 
     def get_content_type(self):
         assert self.absolute_path is not None
@@ -879,7 +879,7 @@ def validate_absolute_path(self, root, absolute_path):
         return abs_path
 
 
-def json_errors(method):
+def json_errors(method):  # pragma: no cover
     """Decorate methods with this to return GitHub style JSON errors.
 
     This should be used on any JSON API on any handler method that can raise HTTPErrors.
diff --git a/tests/test_handlers.py b/tests/test_handlers.py
new file mode 100644
index 0000000000..bb4fcf0ce8
--- /dev/null
+++ b/tests/test_handlers.py
@@ -0,0 +1,125 @@
+"""Test Base Handlers"""
+import os
+import warnings
+from unittest.mock import MagicMock
+
+from tornado.httpserver import HTTPRequest
+from tornado.httputil import HTTPHeaders
+
+from jupyter_server.auth import AllowAllAuthorizer, IdentityProvider
+from jupyter_server.base.handlers import (
+    APIHandler,
+    APIVersionHandler,
+    AuthenticatedFileHandler,
+    AuthenticatedHandler,
+    FilesRedirectHandler,
+    JupyterHandler,
+    RedirectWithParams,
+)
+from jupyter_server.serverapp import ServerApp
+
+
+def test_authenticated_handler(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    request = HTTPRequest("OPTIONS")
+    request.connection = MagicMock()
+    handler = AuthenticatedHandler(app.web_app, request)
+    for key in list(handler.settings):
+        del handler.settings[key]
+    handler.settings["headers"] = {"Content-Security-Policy": "foo"}
+
+    assert handler.content_security_policy == "foo"
+    assert handler.skip_check_origin()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        assert handler.login_handler == handler.identity_provider.login_handler_class
+        assert isinstance(handler.authorizer, AllowAllAuthorizer)
+        assert isinstance(handler.identity_provider, IdentityProvider)
+
+
+def test_jupyter_handler(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    headers = HTTPHeaders({"Origin": "foo"})
+    request = HTTPRequest("OPTIONS", headers=headers)
+    request.connection = MagicMock()
+    handler = JupyterHandler(app.web_app, request)
+    for key in list(handler.settings):
+        del handler.settings[key]
+    handler.settings["mathjax_url"] = "foo"
+    handler.settings["mathjax_config"] = "bar"
+    assert handler.mathjax_url == "/foo"
+    assert handler.mathjax_config == "bar"
+    handler.settings["terminal_manager"] = "fizz"
+    assert handler.terminal_manager == "fizz"
+    handler.settings["allow_origin"] = True
+    handler.set_cors_headers()
+    handler.settings["allow_origin"] = False
+    handler.settings["allow_origin_pat"] = "foo"
+    handler.settings["allow_credentials"] = True
+    handler.set_cors_headers()
+    assert handler.check_referer() is True
+
+
+def test_api_handler(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    headers = HTTPHeaders({"Origin": "foo"})
+    request = HTTPRequest("OPTIONS", headers=headers)
+    request.connection = MagicMock()
+    handler = APIHandler(app.web_app, request)
+    for key in list(handler.settings):
+        del handler.settings[key]
+    handler.options()
+
+
+async def test_authenticated_file_handler(jp_serverapp, tmpdir):
+    app: ServerApp = jp_serverapp
+    headers = HTTPHeaders({"Origin": "foo"})
+    request = HTTPRequest("HEAD", headers=headers)
+    request.connection = MagicMock()
+    test_file = tmpdir / "foo"
+    with open(test_file, "w") as fid:
+        fid.write("hello")
+
+    handler = AuthenticatedFileHandler(app.web_app, request, path=str(tmpdir))
+    for key in list(handler.settings):
+        del handler.settings[key]
+    handler.check_xsrf_cookie = MagicMock()  # type:ignore
+    handler._jupyter_current_user = "foo"  # type:ignore
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        await handler.head("foo")
+    assert handler.get_status() == 200
+
+
+async def test_api_version_handler(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    request = HTTPRequest("GET")
+    request.connection = MagicMock()
+    handler = APIVersionHandler(app.web_app, request)
+    handler._transforms = []
+    handler.get()
+    assert handler.get_status() == 200
+
+
+async def test_files_redirect_handler(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    request = HTTPRequest("GET")
+    request.connection = MagicMock()
+    test_file = os.path.join(app.contents_manager.root_dir, "foo")
+    with open(test_file, "w") as fid:
+        fid.write("hello")
+    handler = FilesRedirectHandler(app.web_app, request)
+    handler._transforms = []
+    await handler.get("foo")
+    assert handler.get_status() == 302
+
+
+def test_redirect_with_params(jp_serverapp):
+    app: ServerApp = jp_serverapp
+    request = HTTPRequest("GET")
+    request.connection = MagicMock()
+    request.query = "foo"
+    handler = RedirectWithParams(app.web_app, request, url="foo")
+    handler._transforms = []
+    handler.get()
+    assert handler.get_status() == 301