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-rw-r--r--Lib/test/test_file.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index 4e392b770c..67c3d864d8 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -139,7 +139,7 @@ class OtherFileTests:
def testModeStrings(self):
# check invalid mode strings
- for mode in ("", "aU", "wU+"):
+ for mode in ("", "aU", "wU+", "U+", "+U", "rU+"):
try:
f = self.open(TESTFN, mode)
except ValueError: