1 files changed, 102 insertions, 0 deletions
diff --git a/sources/pyside6/tests/QtCore/errormessages_with_features_test.py b/sources/pyside6/tests/QtCore/errormessages_with_features_test.py
new file mode 100644
index 000000000..97c4f942e
--- /dev/null
+++ b/sources/pyside6/tests/QtCore/errormessages_with_features_test.py
@@ -0,0 +1,102 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+import os
+import sys
+import unittest
+
+from pathlib import Path
+sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
+from init_paths import init_test_paths
+init_test_paths(False)
+
+from PySide6 import QtCore
+from PySide6.QtWidgets import QApplication, QLabel
+
+is_pypy = hasattr(sys, "pypy_version_info")
+if not is_pypy:
+    from PySide6.support import feature
+
+import inspect
+
+"""
+errormessages_with_features_test.py
+-----------------------------------
+
+When errors occur while features are switched, we must always produce a
+valid error message.
+
+This test is in its own file because combining it with
+"snake_prop_feature_test" gave strange interactions with the other tests.
+"""
+
+
+@unittest.skipIf(is_pypy, "__feature__ cannot yet be used with PyPy")
+class ErrormessagesWithFeatures(unittest.TestCase):
+    probe = "called with wrong argument types"
+
+    def setUp(self):
+        qApp or QApplication()
+        feature.reset()
+
+    def tearDown(self):
+        feature.reset()
+        qApp.shutdown()
+
+    def testCorrectErrorMessagesPlain(self):
+        with self.assertRaises(TypeError) as cm:
+            QLabel().setFont(42)
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testCorrectErrorMessagesSnake(self):
+        from __feature__ import snake_case
+        with self.assertRaises(TypeError) as cm:
+            QLabel().set_font(42)
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testCorrectErrorMessagesProp(self):
+        from __feature__ import true_property
+        with self.assertRaises(TypeError) as cm:
+            QLabel().font = 42
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testCorrectErrorMessagesSnakeProp(self):
+        from __feature__ import snake_case, true_property
+        with self.assertRaises(TypeError) as cm:
+            QLabel().font = 42
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testCorrectErrorMessagesClassProp(self):
+        from __feature__ import true_property
+        with self.assertRaises(TypeError) as cm:
+            QApplication.quitOnLastWindowClosed = object
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+        with self.assertRaises(TypeError) as cm:
+            qApp.quitOnLastWindowClosed = object
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testCorrectErrorMessagesClassSnakeProp(self):
+        from __feature__ import snake_case, true_property
+        with self.assertRaises(TypeError) as cm:
+            QApplication.quit_on_last_window_closed = object
+        print("\n\n" + cm.exception.args[0])
+        self.assertTrue(self.probe in cm.exception.args[0])
+        with self.assertRaises(TypeError) as cm:
+            qApp.quit_on_last_window_closed = object
+        self.assertTrue(self.probe in cm.exception.args[0])
+
+    def testDocIsWorking(self):
+        """
+        make sure that it does not crash when touched
+        """
+        inspect.getdoc(QApplication)
+        inspect.getdoc(QtCore)
+
+
+if __name__ == '__main__':
+    unittest.main()