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Diffstat (limited to 'Lib/test/test_io.py')
| -rw-r--r-- | Lib/test/test_io.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py index 0b5b033..88fd6ce 100644 --- a/Lib/test/test_io.py +++ b/Lib/test/test_io.py @@ -3348,6 +3348,17 @@ class TextIOWrapperTest(unittest.TestCase): F.tell = lambda x: 0 t = self.TextIOWrapper(F(), encoding='utf-8') + def test_issue25862(self): + # Assertion failures occurred in tell() after read() and write(). + t = self.TextIOWrapper(self.BytesIO(b'test'), encoding='ascii') + t.read(1) + t.read() + t.tell() + t = self.TextIOWrapper(self.BytesIO(b'test'), encoding='ascii') + t.read(1) + t.write('x') + t.tell() + class MemviewBytesIO(io.BytesIO): '''A BytesIO object whose read method returns memoryviews |