From 3be40bd7d53369fb1895b9664fe4b91b900cff31 Mon Sep 17 00:00:00 2001
From: azibom <mrsh13610@gmail.com>
Date: Sat, 23 May 2026 15:04:53 +0000
Subject: [PATCH] Add tests for computed flow control write limits

---
 Lib/test/test_asyncio/test_transports.py | 28 ++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Lib/test/test_asyncio/test_transports.py b/Lib/test/test_asyncio/test_transports.py
index dbb572e2e1536b..2b98f09c937e6e 100644
--- a/Lib/test/test_asyncio/test_transports.py
+++ b/Lib/test/test_asyncio/test_transports.py
@@ -98,6 +98,34 @@ def get_write_buffer_size(self):
         self.assertTrue(transport._protocol_paused)
         self.assertEqual(transport.get_write_buffer_limits(), (128, 256))
 
+    def test_flowcontrol_mixin_compute_write_limits(self):
+
+        class MyTransport(transports._FlowControlMixin,
+                          transports.Transport):
+
+            def get_write_buffer_size(self):
+                return 0
+
+        loop = mock.Mock()
+        transport = MyTransport(loop=loop)
+
+        self.assertEqual(
+            transport.get_write_buffer_limits(),
+            (16 * 1024, 64 * 1024)
+        )
+
+        transport.set_write_buffer_limits(low=100)
+        self.assertEqual(
+            transport.get_write_buffer_limits(),
+            (100, 400)
+        )
+
+        transport.set_write_buffer_limits(high=200)
+        self.assertEqual(
+            transport.get_write_buffer_limits(),
+            (50, 200)
+        )
+
 
 if __name__ == '__main__':
     unittest.main()