Set pytest's import mode to importlib

Author: maresb

conftest.py

@@ -1,8 +1,14 @@
 import os
+import sys
+from pathlib import Path
 
 import pytest
 
 
+repo_root = Path(__file__).parent
+sys.path.insert(0, str(repo_root))
+
+
 def pytest_sessionstart(session):
     os.environ["PYTENSOR_FLAGS"] = ",".join(
         [

pyproject.toml

@@ -117,7 +117,7 @@ versionfile_build = "pytensor/_version.py"
 tag_prefix = "rel-"
 
 [tool.pytest]
-addopts = "--durations=50  --doctest-modules pytensor --ignore=pytensor/misc/check_duplicate_key.py --ignore=pytensor/link"
+addopts = "--durations=50  --doctest-modules pytensor --import-mode=importlib --ignore=pytensor/misc/check_duplicate_key.py --ignore=pytensor/link"
 testpaths = "tests/"
 
 [tool.ruff]