diff --git a/tests/regrtest_data/source_roots_implicit_namespace_pkg/tests/_test_app.py b/tests/regrtest_data/source_roots_implicit_namespace_pkg/tests/testapp.py
similarity index 100%
rename from tests/regrtest_data/source_roots_implicit_namespace_pkg/tests/_test_app.py
rename to tests/regrtest_data/source_roots_implicit_namespace_pkg/tests/testapp.py
diff --git a/tests/regrtest_data/source_roots_src_layout/tests/_test_app.py b/tests/regrtest_data/source_roots_src_layout/tests/testapp.py
similarity index 100%
rename from tests/regrtest_data/source_roots_src_layout/tests/_test_app.py
rename to tests/regrtest_data/source_roots_src_layout/tests/testapp.py