diff --git a/daphne/cli.py b/daphne/cli.py
index 715ef14..adea81a 100755
--- a/daphne/cli.py
+++ b/daphne/cli.py
@@ -7,7 +7,6 @@ from .access import AccessLogGenerator
 from .endpoints import build_endpoint_description_strings
 from .server import Server
 from .utils import import_by_path
-from argparse import ArgumentError, Namespace
 
 logger = logging.getLogger(__name__)
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 2507f69..82f062d 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -192,14 +192,7 @@ class TestCLIInterface(TestCase):
         """
         Tests entirely custom endpoints
         """
-        self.assertCLI(
-            ["-e", "imap:"],
-            {
-                "endpoints": [
-                    "imap:",
-                ],
-            },
-        )
+        self.assertCLI(["-e", "imap:"], {"endpoints": ["imap:"]})
 
     def test_default_proxyheaders(self):
         """