feat(main_window): timer to show hide scan progress when it is relevant only

tests/unit_tests/test_main_widnow.py

@@ -187,3 +187,44 @@ def test_bec_weblinks(monkeypatch):
         "https://bec.readthedocs.io/projects/bec-widgets/en/latest/",
         "https://gitlab.psi.ch/groups/bec/-/issues/",
     ]
+
+
+#################################################################
+# Tests for scan‑progress bar animations
+
+
+def test_scan_progress_bar_show_animation(qtbot, bec_main_window):
+    """
+    _show_scan_progress_bar should animate the container's maximumWidth
+    from 0 to the configured target width.
+    """
+    container = bec_main_window._scan_progress_bar_with_separator
+
+    # Pre‑condition: collapsed
+    assert container.maximumWidth() == 0
+
+    bec_main_window._show_scan_progress_bar()
+
+    target = bec_main_window._scan_progress_bar_target_width
+    qtbot.waitUntil(lambda: container.maximumWidth() == target, timeout=2000)
+
+    assert container.maximumWidth() == target
+
+
+def test_scan_progress_bar_hide_animation(qtbot, bec_main_window):
+    """
+    _animate_hide_scan_progress_bar should collapse the container back to 0 width.
+    """
+    container = bec_main_window._scan_progress_bar_with_separator
+
+    # First expand it
+    bec_main_window._show_scan_progress_bar()
+    target = bec_main_window._scan_progress_bar_target_width
+    qtbot.waitUntil(lambda: container.maximumWidth() == target, timeout=2000)
+
+    # Trigger hide animation
+    bec_main_window._animate_hide_scan_progress_bar()
+
+    qtbot.waitUntil(lambda: container.maximumWidth() == 0, timeout=2000)
+
+    assert container.maximumWidth() == 0