1 files changed, 76 insertions, 0 deletions
diff --git a/sources/pyside6/tests/QtWidgets/qstyle_test.py b/sources/pyside6/tests/QtWidgets/qstyle_test.py
new file mode 100644
index 000000000..5a9b29dc6
--- /dev/null
+++ b/sources/pyside6/tests/QtWidgets/qstyle_test.py
@@ -0,0 +1,76 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+import sys
+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 helper.usesqapplication import UsesQApplication
+
+from PySide6.QtGui import QWindow
+from PySide6.QtWidgets import (QApplication, QFontComboBox, QLabel, QProxyStyle,
+                               QStyleFactory, QWidget)
+
+
+class ProxyStyle(QProxyStyle):
+
+    def __init__(self, style):
+        QProxyStyle.__init__(self, style)
+        self.polished = 0
+
+    def polish(self, widget):
+        self.polished = self.polished + 1
+        super(ProxyStyle, self).polish(widget)
+
+
+class SetStyleTest(UsesQApplication):
+    '''Tests setting the same QStyle for all objects in a UI hierarchy.'''
+
+    def testSetStyle(self):
+        '''All this test have to do is not break with some invalid Python wrapper.'''
+
+        def setStyleHelper(widget, style):
+            widget.setStyle(style)
+            widget.setPalette(style.standardPalette())
+            for child in widget.children():
+                if isinstance(child, QWidget):
+                    setStyleHelper(child, style)
+
+        container = QWidget()
+        # QFontComboBox is used because it has an QLineEdit created in C++ inside it,
+        # and if the QWidget.setStyle(style) steals the ownership of the style
+        # for the C++ originated widget everything will break.
+        fontComboBox = QFontComboBox(container)
+        label = QLabel(container)
+        label.setText('Label')
+        style = QStyleFactory.create(QStyleFactory.keys()[0])
+        setStyleHelper(container, style)
+
+    def testSetProxyStyle(self):
+        label = QLabel("QtWidgets/ProxyStyle test")
+        baseStyle = QStyleFactory.create(QApplication.instance().style().objectName())
+        self.assertTrue(baseStyle)
+        proxyStyle = ProxyStyle(baseStyle)
+        label.setStyle(proxyStyle)
+        label.show()
+        while not label.windowHandle().isExposed():
+            QApplication.instance().processEvents()
+        self.assertTrue(proxyStyle.polished > 0)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testSetStyleOwnership(self):
+        style = QStyleFactory.create(QStyleFactory.keys()[0])
+        self.assertEqual(sys.getrefcount(style), 2)
+        QApplication.instance().setStyle(style)
+        self.assertEqual(sys.getrefcount(style), 3)
+
+
+if __name__ == '__main__':
+    unittest.main()
+