diff --git a/tests/test_throttling.py b/tests/test_throttling.py
index 84304549c..4937aa7ae 100644
--- a/tests/test_throttling.py
+++ b/tests/test_throttling.py
@@ -186,10 +186,7 @@ def test_throttle_auth():
     set_throttle_timer(th, 2)
     assert th.allow_request(request) is True
 
-    assert (
-        th.get_cache_key(request)
-        == "throttle_auth_a6b46dd0d1ae5e86cbc8f37e75ceeb6760230c1ca4ffbcb0c97b96dd7d9c464b"
-    )
+    assert th.get_cache_key(request) == "throttle_auth_a6b46dd0d1ae5e86cbc8f37e75ceeb6760230c1ca4ffbcb0c97b96dd7d9c464b"
 
 
 def test_throttle_user():
@@ -212,9 +209,7 @@ def test_throttle_user():
     request.user.is_authenticated = False
     assert th.allow_request(request) is True
     assert th.allow_request(request) is False
-    assert (
-        th.get_cache_key(request) == "throttle_user_8.8.8.8"
-    )  # not authenticated throttled by IP
+    assert th.get_cache_key(request) == "throttle_user_8.8.8.8"  # not authenticated throttled by IP
 
 
 def test_wait():
@@ -267,6 +262,9 @@ def test_rate_parser():
     assert th.parse_rate("10_000/7d") == (10000, 86400 * 7)
     assert th.parse_rate("10_000/7day") == (10000, 86400 * 7)
 
+    with pytest.raises(ValueError):
+        th.parse_rate("42")
+
 
 def test_proxy_throttle():
     from ninja.conf import settings