commit d39c19255910b9dce08c595f511597e98b09e91f
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Jan 11 23:40:09 2019 -0800
committer GitHub <noreply@github.com> Fri Jan 11 23:40:09 2019 -0800
tree 143d8ea12e92c3fb56e8864d08381d42a4e72f9f
parent 059997d78ed1a1a5a364b1846ac972c98c704927

bpo-33817: Fix _PyBytes_Resize() for empty bytes object. (GH-11516)


Add also tests for PyUnicode_FromFormat() and PyBytes_FromFormat()
with empty result.
(cherry picked from commit 44cc4822bb3799858201e61294c5863f93ec12e2)

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

Lib/test/test_unicode.py

diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 3cc018c..1aad933 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -2676,6 +2676,12 @@
         check_format('%.%s',
                      b'%.%s', b'abc')
 
+        # Issue #33817: empty strings
+        check_format('',
+                     b'')
+        check_format('',
+                     b'%s', b'')
+
     # Test PyUnicode_AsWideChar()
     @support.cpython_only
     def test_aswidechar(self):