Enable 3.13-dev tests

.github/workflows/build.yml

@@ -165,7 +165,7 @@ jobs:
         # macOS runners are expensive, and we assume that Ubuntu is enough to cover the Unix case.
         os: [ubuntu-latest, windows-latest]
         # Run the tests on the oldest and most recent versions of Python.
-        python: ['3.8', '3.x', '3.12-dev']
+        python: ['3.8', '3.x', '3.13-dev']
 
     steps:
       - name: Checkout

.github/workflows/pr-check.yml

@@ -147,7 +147,7 @@ jobs:
         # macOS runners are expensive, and we assume that Ubuntu is enough to cover the Unix case.
         os: [ubuntu-latest, windows-latest]
         # Run the tests on the oldest and most recent versions of Python.
-        python: ['3.8', '3.x'] # run for 3 pytest versions, most recent stable, oldest version supported and pre-release
+        python: ['3.8', '3.x', '3.13-dev'] # run for 3 pytest versions, most recent stable, oldest version supported and pre-release
         pytest-version: ['pytest', 'pytest@pre-release', 'pytest==6.2.0']
 
     steps:

python_files/testing_tools/adapter/util.py

@@ -102,6 +102,12 @@ def _resolve_relpath(
     if path.startswith("./"):
         return path[2:]
     if not _path_isabs(path):
+        if rootdir:
+            rootdir = rootdir.replace(_pathsep, "/")
+            if not rootdir.endswith("/"):
+                rootdir += "/"
+            if _normcase(path).startswith(_normcase(rootdir)):
+                return path[len(rootdir) :]
         return path
 
     # Deal with root-dir-as-fileid.