added motion trajectory simulation

apps/autocal/tests/conftest.py

@@ -81,6 +81,32 @@ def tmp_dir():
     shutil.rmtree(path, ignore_errors=True)
 
 
+@pytest.fixture(autouse=True)
+def _isolate_preference_file(monkeypatch):
+    """Send every preference write to scratch, whatever the test does.
+
+    Not a convenience: a single test that built a window without this redirect
+    left its own scratch bundle path in the *real* ``apps/autocal/preference.json``
+    through ``closeEvent``, so the installed app then started up remembering a
+    bundle that did not exist. A test-side leak that presents as a bench bug is
+    worth a session-wide net rather than a note in each test.
+    """
+    import shutil
+
+    from orisys_app_shared import paths as paths_mod
+    from orisys_app_shared import prefs as prefs_pkg
+
+    from orisys_autocal import preferences as prefs_mod
+
+    scratch = _scratch_dir()
+    prefs_file = scratch / "preference.json"
+    monkeypatch.setattr(paths_mod, "preference_path", lambda: prefs_file)
+    monkeypatch.setattr(prefs_pkg.store, "preference_path", lambda: prefs_file)
+    monkeypatch.setattr(prefs_mod, "preference_path", lambda: prefs_file)
+    yield
+    shutil.rmtree(scratch, ignore_errors=True)
+
+
 @pytest.fixture
 def make_window(qt_app, monkeypatch):
     """Build a window whose preference writes stay inside a scratch directory.