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Support py37's new breakpoint() function #3180

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nicoddemus opened this Issue Feb 1, 2018 · 4 comments

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nicoddemus commented Feb 1, 2018

Python 3.7 will have a new breakpoint() function to enter the debugger and pytest should play well with it.

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tonybaloney commented Mar 18, 2018

Help needed? (pleeeease can I implement this!)

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nicoddemus commented Mar 18, 2018

@tonybaloney sure, please go ahead! 😁

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tonybaloney commented Mar 18, 2018

This is my thinking:

  • Check for existence of breakpoint in builtins to determine if version of Python implements PEP553 https://www.python.org/dev/peps/pep-0553/#implementation this means that if PyPy/PyPy3 etc. later decide to do so we're not coupling to CPython. Add a "supports_breakpoint_builtin" module-level attribute in pytest.debugging
  • Set the breakpoint sys.breakpointhook to the custom Pdb class implemented in https://github.com/pytest-dev/pytest/blob/master/_pytest/debugging.py#L44 that way if a user just calls breakpoint() inside a test it will invoke the custom Pytest Pdb with the terminalwriter fixes.
  • The custom Pdb module should only be set as the system breakpointhook when the user hasn't set PYTHONBREAKPOINT. Otherwise the user may have wanted to override the debugger using the PYTHONBREAKPOINT environment variable.
  • Cleanup and reverse back to sys.breakpointhook in https://github.com/pytest-dev/pytest/blob/master/_pytest/debugging.py#L32-L35
  • If the user sets PYTHONBREAKPOINT=0 then neither the normal Pdb or the custom one should be called on the occurence of an unhandled exception
  • If the user sets PYTHONBREAKPOINT = a custom debugger then it should use that in instead of Custom PDB, unless they have specified --pdbcls
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flub commented Mar 18, 2018

Sounds good. One thing to look out for is probably check that external plugins like pytest-ipdb will keep working, bonus points if they automatically support breakpoint as well.

guykisel added a commit to guykisel/inline-plz that referenced this issue Jul 6, 2018

Update pytest to 3.6.3 (#302)
This PR updates [pytest](https://pypi.org/project/pytest) from **3.5.1** to **3.6.3**.



<details>
  <summary>Changelog</summary>
  
  
   ### 3.6.2
   ```
   =========================

Bug Fixes
---------

- Fix regression in ``Node.add_marker`` by extracting the mark object of a
  ``MarkDecorator``. (`3555
  &lt;https://github.com/pytest-dev/pytest/issues/3555&gt;`_)

- Warnings without ``location`` were reported as ``None``. This is corrected to
  now report ``&lt;undetermined location&gt;``. (`3563
  &lt;https://github.com/pytest-dev/pytest/issues/3563&gt;`_)

- Continue to call finalizers in the stack when a finalizer in a former scope
  raises an exception. (`3569
  &lt;https://github.com/pytest-dev/pytest/issues/3569&gt;`_)

- Fix encoding error with `print` statements in doctests (`3583
  &lt;https://github.com/pytest-dev/pytest/issues/3583&gt;`_)


Improved Documentation
----------------------

- Add documentation for the ``--strict`` flag. (`3549
  &lt;https://github.com/pytest-dev/pytest/issues/3549&gt;`_)


Trivial/Internal Changes
------------------------

- Update old quotation style to parens in fixture.rst documentation. (`3525
  &lt;https://github.com/pytest-dev/pytest/issues/3525&gt;`_)

- Improve display of hint about ``--fulltrace`` with ``KeyboardInterrupt``.
  (`3545 &lt;https://github.com/pytest-dev/pytest/issues/3545&gt;`_)

- pytest&#39;s testsuite is no longer runnable through ``python setup.py test`` --
  instead invoke ``pytest`` or ``tox`` directly. (`3552
  &lt;https://github.com/pytest-dev/pytest/issues/3552&gt;`_)

- Fix typo in documentation (`3567
  &lt;https://github.com/pytest-dev/pytest/issues/3567&gt;`_)
   ```
   
  
  
   ### 3.6.1
   ```
   =========================

Bug Fixes
---------

- Fixed a bug where stdout and stderr were logged twice by junitxml when a test
  was marked xfail. (`3491
  &lt;https://github.com/pytest-dev/pytest/issues/3491&gt;`_)

- Fix ``usefixtures`` mark applyed to unittest tests by correctly instantiating
  ``FixtureInfo``. (`3498
  &lt;https://github.com/pytest-dev/pytest/issues/3498&gt;`_)

- Fix assertion rewriter compatibility with libraries that monkey patch
  ``file`` objects. (`3503
  &lt;https://github.com/pytest-dev/pytest/issues/3503&gt;`_)


Improved Documentation
----------------------

- Added a section on how to use fixtures as factories to the fixture
  documentation. (`3461 &lt;https://github.com/pytest-dev/pytest/issues/3461&gt;`_)


Trivial/Internal Changes
------------------------

- Enable caching for pip/pre-commit in order to reduce build time on
  travis/appveyor. (`3502
  &lt;https://github.com/pytest-dev/pytest/issues/3502&gt;`_)

- Switch pytest to the src/ layout as we already suggested it for good practice
  - now we implement it as well. (`3513
  &lt;https://github.com/pytest-dev/pytest/issues/3513&gt;`_)

- Fix if in tests to support 3.7.0b5, where a docstring handling in AST got
  reverted. (`3530 &lt;https://github.com/pytest-dev/pytest/issues/3530&gt;`_)

- Remove some python2.5 compatibility code. (`3529
  &lt;https://github.com/pytest-dev/pytest/issues/3529&gt;`_)
   ```
   
  
  
   ### 3.6.0
   ```
   =========================

Features
--------

- Revamp the internals of the ``pytest.mark`` implementation with correct per
  node handling which fixes a number of long standing bugs caused by the old
  design. This introduces new ``Node.iter_markers(name)`` and
  ``Node.get_closest_mark(name)`` APIs. Users are **strongly encouraged** to
  read the `reasons for the revamp in the docs
  &lt;https://docs.pytest.org/en/latest/mark.htmlmarker-revamp-and-iteration&gt;`_,
  or jump over to details about `updating existing code to use the new APIs
  &lt;https://docs.pytest.org/en/latest/mark.htmlupdating-code&gt;`_. (`3317
  &lt;https://github.com/pytest-dev/pytest/issues/3317&gt;`_)

- Now when ``pytest.fixture`` is applied more than once to the same function a
  ``ValueError`` is raised. This buggy behavior would cause surprising problems
  and if was working for a test suite it was mostly by accident. (`2334
  &lt;https://github.com/pytest-dev/pytest/issues/2334&gt;`_)

- Support for Python 3.7&#39;s builtin ``breakpoint()`` method, see `Using the
  builtin breakpoint function
  &lt;https://docs.pytest.org/en/latest/usage.htmlbreakpoint-builtin&gt;`_ for
  details. (`3180 &lt;https://github.com/pytest-dev/pytest/issues/3180&gt;`_)

- ``monkeypatch`` now supports a ``context()`` function which acts as a context
  manager which undoes all patching done within the ``with`` block. (`3290
  &lt;https://github.com/pytest-dev/pytest/issues/3290&gt;`_)

- The ``--pdb`` option now causes KeyboardInterrupt to enter the debugger,
  instead of stopping the test session. On python 2.7, hitting CTRL+C again
  exits the debugger. On python 3.2 and higher, use CTRL+D. (`3299
  &lt;https://github.com/pytest-dev/pytest/issues/3299&gt;`_)

- pytest not longer changes the log level of the root logger when the
  ``log-level`` parameter has greater numeric value than that of the level of
  the root logger, which makes it play better with custom logging configuration
  in user code. (`3307 &lt;https://github.com/pytest-dev/pytest/issues/3307&gt;`_)


Bug Fixes
---------

- A rare race-condition which might result in corrupted ``.pyc`` files on
  Windows has been hopefully solved. (`3008
  &lt;https://github.com/pytest-dev/pytest/issues/3008&gt;`_)

- Also use iter_marker for discovering the marks applying for marker
  expressions from the cli to avoid the bad data from the legacy mark storage.
  (`3441 &lt;https://github.com/pytest-dev/pytest/issues/3441&gt;`_)

- When showing diffs of failed assertions where the contents contain only
  whitespace, escape them using ``repr()`` first to make it easy to spot the
  differences. (`3443 &lt;https://github.com/pytest-dev/pytest/issues/3443&gt;`_)


Improved Documentation
----------------------

- Change documentation copyright year to a range which auto-updates itself each
  time it is published. (`3303
  &lt;https://github.com/pytest-dev/pytest/issues/3303&gt;`_)


Trivial/Internal Changes
------------------------

- ``pytest`` now depends on the `python-atomicwrites
  &lt;https://github.com/untitaker/python-atomicwrites&gt;`_ library. (`3008
  &lt;https://github.com/pytest-dev/pytest/issues/3008&gt;`_)

- Update all pypi.python.org URLs to pypi.org. (`3431
  &lt;https://github.com/pytest-dev/pytest/issues/3431&gt;`_)

- Detect `pytest_` prefixed hooks using the internal plugin manager since
  ``pluggy`` is deprecating the ``implprefix`` argument to ``PluginManager``.
  (`3487 &lt;https://github.com/pytest-dev/pytest/issues/3487&gt;`_)

- Import ``Mapping`` and ``Sequence`` from ``_pytest.compat`` instead of
  directly from ``collections`` in ``python_api.py::approx``. Add ``Mapping``
  to ``_pytest.compat``, import it from ``collections`` on python 2, but from
  ``collections.abc`` on Python 3 to avoid a ``DeprecationWarning`` on Python
  3.7 or newer. (`3497 &lt;https://github.com/pytest-dev/pytest/issues/3497&gt;`_)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pytest
  - Changelog: https://pyup.io/changelogs/pytest/
  - Repo: https://github.com/pytest-dev/pytest/issues
  - Homepage: http://pytest.org
</details>
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