migrate pyqt5 to pyside6

apps/autocal/tests/conftest.py

@@ -66,6 +66,21 @@ def _scratch_dir() -> Path:
     return path
 
 
+@pytest.fixture
+def tmp_dir():
+    """A workspace-local scratch directory, cleared per test.
+
+    Deliberately not ``tmp_path``: this suite has to run inside a sandboxed
+    shell, and ``tmp_path`` depends on a writable process temp root that such an
+    environment may not provide.
+    """
+    import shutil
+
+    path = _scratch_dir()
+    yield path
+    shutil.rmtree(path, ignore_errors=True)
+
+
 @pytest.fixture
 def make_window(qt_app, monkeypatch):
     """Build a window whose preference writes stay inside a scratch directory.