chore: ensure test names differ by more than just case (#12729)

These tests may lead to issues on case insensitive file systems.

tests/lint.py

@@ -190,5 +190,16 @@ for file in Path().glob("**/run_bench"):
         nag("has env_test.sh", file)
 
 
+# File confusion by case insensitive filesystems,
+# applies to entire repository
+
+seen: set[str] = set()
+for file in Path("..").glob("**/*"):
+    path = str(file).lower()
+    if path in seen:
+        nag("case sensitive", file)
+    seen.add(path)
+
+
 if ERROR:
     sys.exit(1)