commit e49bf0f353a968cddc4d8e6ea668b9d2d116e2ac
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Sat Feb 24 09:39:18 2018 -0800
committer GitHub <noreply@github.com> Sat Feb 24 09:39:18 2018 -0800
tree 1dbc9e1dc01efec399c905691542eeb9a671c0ac
parent 46632f4d3c1f3aef875d2ada750a298ab0510992

bpo-31966: Fixed WindowsConsoleIO.write() for writing empty data. (GH-5754)

(cherry picked from commit 42c35d9c0c8175332f50fbe034a001fe52f057b9)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Lib/test/test_winconsoleio.py

diff --git a/Lib/test/test_winconsoleio.py b/Lib/test/test_winconsoleio.py
index 656483c..a78fa4d 100644
--- a/Lib/test/test_winconsoleio.py
+++ b/Lib/test/test_winconsoleio.py
@@ -121,6 +121,10 @@
             else:
                 self.assertNotIsInstance(f, ConIO)
 
+    def test_write_empty_data(self):
+        with ConIO('CONOUT$', 'w') as f:
+            self.assertEqual(f.write(b''), 0)
+
     def assertStdinRoundTrip(self, text):
         stdin = open('CONIN$', 'r')
         old_stdin = sys.stdin