add

server/.venv/lib/python3.11/site-packages/_pytest/assertion/highlight.py

@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+from typing import Literal
+
+
+def dummy_highlighter(source: str, lexer: Literal["diff", "python"] = "python") -> str:
+    """Dummy highlighter that returns the text unprocessed.
+
+    Needed for _notin_text, as the diff gets post-processed to only show the "+" part.
+    """
+    return source