Treat zero byte stream as a file.

[diedmon]

Ref to issue #549 and issue #398. This pull request will fix those issues by treating zero byte stream as a file.

[miurahr]

@diedmon could you add or enable unit test which reproduce the case a PR fixed?

[diedmon]

@miurahr I don't how to enable unit test, but I attached the test file in the attachment.

test_empty_stream.zip

[miurahr]

Please put your test in test_archive.py/tests.

You need to use tmp_path fixture to make target file in temporary folder.
like def test_something(tmp_path):

[diedmon]

Hi, @miurahr, thank you for your guide. I have updated the test_archive.py.

[miurahr]

tox: check
check: commands[0]> flake8 py7zr tests
tests/test_archive.py:1170:3: BLK100 Black would make changes.
tests/test_archive.py:1170:3: E111 indentation is not a multiple of 4
tests/test_archive.py:1171:43: E231 missing whitespace after ','
tests/test_archive.py:1172:7: E111 indentation is not a multiple of 4
tests/test_archive.py:1172:31: E231 missing whitespace after ','
tests/test_archive.py:1173:3: E722 do not use bare 'except'
tests/test_archive.py:1173:3: E111 indentation is not a multiple of 4

[diedmon]

Thank you for your comment, I have corrected the mistakes.

[diedmon]

Thanks for your comment, I didn't realize that pytest can handle the exception properly without try and except. Also, please note that since a zero byte stream is treated as a file, it won't have the "emptystream" attribute anymore.