1 files changed, 57 insertions, 0 deletions
diff --git a/sources/pyside6/tests/QtAsyncio/qasyncio_test_chain.py b/sources/pyside6/tests/QtAsyncio/qasyncio_test_chain.py
new file mode 100644
index 000000000..a0a949720
--- /dev/null
+++ b/sources/pyside6/tests/QtAsyncio/qasyncio_test_chain.py
@@ -0,0 +1,57 @@
+# Copyright (C) 2023 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+'''Test cases for QtAsyncio'''
+
+import unittest
+import asyncio
+import random
+import time
+
+from PySide6.QtAsyncio import QAsyncioEventLoopPolicy
+
+
+class QAsyncioTestCaseChain(unittest.TestCase):
+
+    async def link(self, output, n, i):
+        t = random.randint(0, 5)
+        output += f"link {i}({n}): {t}s "
+        await asyncio.sleep(i)
+        result = f"result {n}-{i}"
+        output += f"link {i}({n}) finished with {result} "
+        return result
+
+    async def chain(self, output, n):
+        link1 = await self.link(output, n, 0.2)
+        link2 = await self.link(output, n, 0.5)
+        output += f"chain {n}: {link1} -> {link2} "
+
+    async def gather(self, output, *args):
+        await asyncio.gather(*(self.chain(output, n) for n in args))
+
+    def test_chain(self):
+        args = [1, 2, 3]
+
+        outputs_expected = []
+        outputs_real = []
+
+        # Run the code without QAsyncioEventLoopPolicy
+        random.seed(17)
+        asyncio.set_event_loop_policy(asyncio.DefaultEventLoopPolicy())
+        start = time.perf_counter()
+        asyncio.run(self.gather(outputs_expected, *args))
+        end_expected = time.perf_counter() - start
+
+        # Run the code with QAsyncioEventLoopPolicy and QtEventLoop
+        random.seed(17)
+        asyncio.set_event_loop_policy(QAsyncioEventLoopPolicy())
+        start = time.perf_counter()
+        asyncio.run(self.gather(outputs_real, *args))
+        end_real = time.perf_counter() - start
+
+        self.assertEqual(outputs_expected, outputs_real)
+        self.assertAlmostEqual(end_expected, end_real, delta=0.5)
+
+
+if __name__ == '__main__':
+    unittest.main()