Added utility to print available tests.

README.md

@@ -480,6 +480,15 @@ options:
   --scale SCALE         scale factor for the UI
   --pyqt6               use PyQt6 rather than PyQt5.
   --use-x11             force the use of x11 on compatible systems
+  --print-tests         print all available tests (widget names).
+# Get a complete list of available tests.
+$ python test/ui.py --print-tests
+aero_wizard                                                                                     
+all_focus_tree                                                                                  
+alpha_colordialog
+...
+wizard
+yes_button
 ```
 
 To see the complete list of Qt widgets covered by the unittests, see [Test Coverage](Test%20Coverage.md).

test/ui.py

@@ -107,6 +107,11 @@ parser.add_argument(
     help='force the use of x11 on compatible systems.',
     action='store_true'
 )
+parser.add_argument(
+    '--print-tests',
+    help='print all available tests (widget names).',
+    action='store_true'
+)
 
 args, unknown = parser.parse_known_args()
 if args.pyqt6:
@@ -2519,13 +2524,21 @@ def test(args, qtargv, test_widget):
 def main():
     'Application entry point'
 
+    def test_names():
+        return [i for i in globals().keys() if i.startswith('test_')]
+
+    def widget_names():
+        return [i[len('test_'):] for i in test_names()]
+
+    if args.print_tests:
+        print('\n'.join(sorted(widget_names())))
+        return 0
+
     # Disable garbage collection to avoid runtime errors.
     gc.disable()
     os.environ['QT_SCALE_FACTOR'] = str(args.scale)
     if args.widget == 'all':
-        all_tests = [i for i in globals().keys() if i.startswith('test_')]
-        all_widgets = [i[len('test_'):] for i in all_tests]
-        for widget in all_widgets:
+        for widget in widget_names():
             test(args, sys.argv[:1] + unknown, widget)
             gc.collect()
     else: