`doctest.OutputChecker` with `doctest.NORMALIZE_WHITESPACE|doctest.ELLIPSIS` flag cannot match ` ... ` with ` `
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stdlib
type-feature
- Dominant language
- Python
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Description
Bug report
Bug description:
import doctest
optflag = doctest.NORMALIZE_WHITESPACE|doctest.ELLIPSIS
OC = doctest.OutputChecker()
want = """
AB ... CD
"""
got = """
AB CD
"""
assert not OC.check_output(want, got, optflag)
This is rather unexpected, since substituting the empty string for ... results in a match.
CPython versions tested on:
3.11
Operating systems tested on:
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at doctest.OutputChecker.check_output and reproduce the supplied example with NORMALIZE_WHITESPACE and ELLIPSIS. Trace how the two flags handle the space around an ellipsis, then verify that the reported AB ... CD versus AB CD case matches as expected and is covered by a regression test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- testing
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 50/100