1 files changed, 123 insertions, 0 deletions
diff --git a/sources/pyside6/tests/signals/lambda_test.py b/sources/pyside6/tests/signals/lambda_test.py
new file mode 100644
index 000000000..23fcdf5fa
--- /dev/null
+++ b/sources/pyside6/tests/signals/lambda_test.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+'''Connecting lambda to signals'''
+
+import os
+import sys
+import unittest
+import weakref
+
+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.QtCore import QCoreApplication, QObject, Signal, SIGNAL, QProcess
+
+from helper.usesqapplication import UsesQApplication
+
+
+class Sender(QObject):
+    void_signal = Signal()
+    int_signal = Signal(int)
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self._delayed_int = 0
+
+    def emit_void(self):
+        self.void_signal.emit()
+
+    def emit_int(self, v):
+        self.int_signal.emit(v)
+
+
+class Receiver(QObject):
+
+    def __init__(self, *args):
+        super().__init__(*args)
+
+
+class BasicCase(unittest.TestCase):
+
+    def testSimplePythonSignalNoArgs(self):
+        # Connecting a lambda to a simple python signal without arguments
+        receiver = Receiver()
+        sender = Sender()
+        sender.void_signal.connect(lambda: setattr(receiver, 'called', True))
+        sender.emit_void()
+        self.assertTrue(receiver.called)
+
+    def testSimplePythonSignal(self):
+        # Connecting a lambda to a simple python signal witharguments
+        receiver = Receiver()
+        sender = Sender()
+        arg = 42
+        sender.int_signal.connect(lambda x: setattr(receiver, 'arg', arg))
+        sender.emit_int(arg)
+        self.assertEqual(receiver.arg, arg)
+
+    def testSimplePythonSignalNoArgsString(self):
+        # Connecting a lambda to a simple python signal without arguments
+        receiver = Receiver()
+        sender = Sender()
+        QObject.connect(sender, SIGNAL('void_signal()'),
+                        lambda: setattr(receiver, 'called', True))
+        sender.emit_void()
+        self.assertTrue(receiver.called)
+
+    def testSimplePythonSignalString(self):
+        # Connecting a lambda to a simple python signal witharguments
+        receiver = Receiver()
+        sender = Sender()
+        arg = 42
+        QObject.connect(sender, SIGNAL('int_signal(int)'),
+                        lambda x: setattr(receiver, 'arg', arg))
+        sender.emit_int(arg)
+        self.assertEqual(receiver.arg, arg)
+
+
+class QtSigLambda(UsesQApplication):
+
+    qapplication = True
+
+    def testWithArgs(self):
+        '''Connecting a lambda to a signal with and without arguments'''
+        proc = QProcess()
+        dummy = Receiver()
+        proc.started.connect(lambda: setattr(dummy, 'called', True))
+        proc.finished.connect(lambda x: setattr(dummy, 'exit_code', x))
+
+        proc.start(sys.executable, ['-c', '""'])
+        self.assertTrue(proc.waitForStarted())
+        self.assertTrue(proc.waitForFinished())
+
+        self.assertTrue(dummy.called)
+        self.assertEqual(dummy.exit_code, proc.exitCode())
+
+    def testRelease(self):
+        """PYSIDE-2646: Test whether main thread target slot lambda/methods
+           (and their captured objects) are released by the signal manager
+           after a while."""
+
+        def do_connect(sender):
+            receiver = Receiver()
+            sender.void_signal.connect(lambda: setattr(receiver, 'called', True))
+            return receiver
+
+        sender = Sender()
+        receiver = weakref.ref(do_connect(sender))
+        sender.emit_void()
+        self.assertTrue(receiver().called)
+        del sender
+        for i in range(3):
+            if not receiver():
+                break
+            QCoreApplication.processEvents()
+        self.assertFalse(receiver())
+
+
+if __name__ == '__main__':
+    unittest.main()