From b95e85ab931565233147d541738cf4ac42fbb7c3 Mon Sep 17 00:00:00 2001
From: Jiajun Xu <jiajunxu2@gmail.com>
Date: Fri, 7 Jun 2024 23:56:55 -0400
Subject: [PATCH] warns when usefixtures is empty

---
 src/_pytest/fixtures.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index 06da52aed..a01b6bfa4 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -1525,6 +1525,8 @@ class FixtureManager:
     def _getusefixturesnames(self, node: nodes.Item) -> Iterator[str]:
         """Return the names of usefixtures fixtures applicable to node."""
         for mark in node.iter_markers(name="usefixtures"):
+            if not mark.args:
+                warnings.warn(f"Warning: empty usefixtures in {node.name}.")
             yield from mark.args
 
     def getfixtureclosure(