Merge pull request #6259 from blueyed/merge-master-into-features

Merge master into features

.github/PULL_REQUEST_TEMPLATE.md

@@ -11,5 +11,13 @@ Here is a quick checklist that should be present in PRs.
 Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:
 
 - [ ] Create a new changelog file in the `changelog` folder, with a name like `<ISSUE NUMBER>.<TYPE>.rst`. See [changelog/README.rst](https://github.com/pytest-dev/pytest/blob/master/changelog/README.rst) for details.
+
+  Write sentences in the **past or present tense**, examples:
+
+  * *Improved verbose diff output with sequences.*
+  * *Terminal summary statistics now use multiple colors.*
+
+  Also make sure to end the sentence with a `.`.
+
 - [ ] Add yourself to `AUTHORS` in alphabetical order.
 -->

.gitignore

@@ -31,6 +31,7 @@ dist/
 issue/
 env/
 .env/
+.venv/
 3rdparty/
 .tox
 .cache

.pre-commit-config.yaml

@@ -37,10 +37,6 @@ repos:
     hooks:
     -   id: pyupgrade
         args: [--py3-plus]
--   repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.4.0
-    hooks:
-    -   id: rst-backticks
 -   repo: https://github.com/pre-commit/mirrors-mypy
     rev: v0.740
     hooks:

AUTHORS

@@ -165,6 +165,7 @@ Marcelo Duarte Trevisani
 Marcin Bachry
 Marco Gorelli
 Mark Abramowitz
+Mark Dickinson
 Markus Unterwaditzer
 Martijn Faassen
 Martin Altmayer

CHANGELOG.rst

@@ -113,7 +113,7 @@ Improvements
 
   Before:
 
-  .. code-block::
+  ::
 
       E   AssertionError: assert ['version', '...version_info'] == ['version', '...version', ...]
       E     Right contains 3 more items, first extra item: ' '
@@ -129,7 +129,7 @@ Improvements
 
   After:
 
-  .. code-block::
+  ::
 
       E   AssertionError: assert ['version', '...version_info'] == ['version', '...version', ...]
       E     Right contains 3 more items, first extra item: ' '
@@ -145,6 +145,8 @@ Improvements
       E       ]
 
 
+- `#5934 <https://github.com/pytest-dev/pytest/issues/5934>`_: ``repr`` of ``ExceptionInfo`` objects has been improved to honor the ``__repr__`` method of the underlying exception.
+
 - `#5936 <https://github.com/pytest-dev/pytest/issues/5936>`_: Display untruncated assertion message with ``-vv``.
 
 
@@ -155,7 +157,7 @@ Improvements
   immutable and avoid accidental modifications.
 
 
-- `#6023 <https://github.com/pytest-dev/pytest/issues/6023>`_: ``pytest.main`` now returns a ``pytest.ExitCode`` instance now, except for when custom exit codes are used (where it returns ``int`` then still).
+- `#6023 <https://github.com/pytest-dev/pytest/issues/6023>`_: ``pytest.main`` returns a ``pytest.ExitCode`` instance now, except for when custom exit codes are used (where it returns ``int`` then still).
 
 
 - `#6026 <https://github.com/pytest-dev/pytest/issues/6026>`_: Align prefixes in output of pytester's ``LineMatcher``.
@@ -167,7 +169,7 @@ Improvements
 - `#6069 <https://github.com/pytest-dev/pytest/issues/6069>`_: ``pytester.spawn`` does not skip/xfail tests on FreeBSD anymore unconditionally.
 
 
-- `#6097 <https://github.com/pytest-dev/pytest/issues/6097>`_: The "[XXX%]" indicator in the test summary is now colored according to the final (new) multi-colored line's main color.
+- `#6097 <https://github.com/pytest-dev/pytest/issues/6097>`_: The "[...%]" indicator in the test summary is now colored according to the final (new) multi-colored line's main color.
 
 
 - `#6116 <https://github.com/pytest-dev/pytest/issues/6116>`_: Added ``--co`` as a synonym to ``--collect-only``.
@@ -3693,7 +3695,7 @@ Deprecations and Removals
 
 - ``pytest.approx`` no longer supports ``>``, ``>=``, ``<`` and ``<=``
   operators to avoid surprising/inconsistent behavior. See `the approx docs
-  <https://docs.pytest.org/en/latest/builtin.html#pytest.approx>`_ for more
+  <https://docs.pytest.org/en/latest/reference.html#pytest-approx>`_ for more
   information. (`#2003 <https://github.com/pytest-dev/pytest/issues/2003>`_)
 
 - All old-style specific behavior in current classes in the pytest's API is
@@ -5050,7 +5052,7 @@ time or change existing behaviors in order to make them less surprising/more use
 * Fix (`#1422`_): junit record_xml_property doesn't allow multiple records
   with same name.
 
-.. _`traceback style docs`: https://pytest.org/latest/usage.html#modifying-python-traceback-printing
+.. _`traceback style docs`: https://pytest.org/en/latest/usage.html#modifying-python-traceback-printing
 
 .. _#1609: https://github.com/pytest-dev/pytest/issues/1609
 .. _#1422: https://github.com/pytest-dev/pytest/issues/1422
@@ -5568,7 +5570,7 @@ time or change existing behaviors in order to make them less surprising/more use
 - add ability to set command line options by environment variable PYTEST_ADDOPTS.
 
 - added documentation on the new pytest-dev teams on bitbucket and
-  github.  See https://pytest.org/latest/contributing.html .
+  github.  See https://pytest.org/en/latest/contributing.html .
   Thanks to Anatoly for pushing and initial work on this.
 
 - fix issue650: new option ``--docttest-ignore-import-errors`` which
@@ -6309,7 +6311,7 @@ Bug fixes:
 - yielded test functions will now have autouse-fixtures active but
   cannot accept fixtures as funcargs - it's anyway recommended to
   rather use the post-2.0 parametrize features instead of yield, see:
-  http://pytest.org/latest/example/parametrize.html
+  http://pytest.org/en/latest/example/parametrize.html
 - fix autouse-issue where autouse-fixtures would not be discovered
   if defined in an a/conftest.py file and tests in a/tests/test_some.py
 - fix issue226 - LIFO ordering for fixture teardowns
@@ -6442,7 +6444,7 @@ Bug fixes:
 - pluginmanager.register(...) now raises ValueError if the
   plugin has been already registered or the name is taken
 
-- fix issue159: improve http://pytest.org/latest/faq.html
+- fix issue159: improve http://pytest.org/en/latest/faq.html
   especially with respect to the "magic" history, also mention
   pytest-django, trial and unittest integration.
 
@@ -6555,7 +6557,7 @@ Bug fixes:
   or through plugin hooks.  Also introduce a "--strict" option which
   will treat unregistered markers as errors
   allowing to avoid typos and maintain a well described set of markers
-  for your test suite.  See exaples at http://pytest.org/latest/mark.html
+  for your test suite.  See exaples at http://pytest.org/en/latest/mark.html
   and its links.
 - issue50: introduce "-m marker" option to select tests based on markers
   (this is a stricter and more predictable version of '-k' in that "-m"
@@ -6738,7 +6740,7 @@ Bug fixes:
 - refinements to "collecting" output on non-ttys
 - refine internal plugin registration and --traceconfig output
 - introduce a mechanism to prevent/unregister plugins from the
-  command line, see http://pytest.org/plugins.html#cmdunregister
+  command line, see http://pytest.org/en/latest/plugins.html#cmdunregister
 - activate resultlog plugin by default
 - fix regression wrt yielded tests which due to the
   collection-before-running semantics were not

CONTRIBUTING.rst

@@ -262,6 +262,19 @@ Here is a simple overview, with pytest-specific bits:
 
    When committing, ``pre-commit`` will re-format the files if necessary.
 
+#. If instead of using ``tox`` you prefer to run the tests directly, then we suggest to create a virtual environment and use
+   an editable install with the ``testing`` extra::
+
+       $ python3 -m venv .venv
+       $ source .venv/bin/activate  # Linux
+       $ .venv/Scripts/activate.bat  # Windows
+       $ pip install -e ".[testing]"
+
+   Afterwards, you can edit the files and run pytest normally::
+
+       $ pytest testing/test_config.py
+
+
 #. Commit and push once your tests pass and you are happy with your change(s)::
 
     $ git commit -a -m "<commit message>"

changelog/5914.bugfix.rst

@@ -0,0 +1 @@
+pytester: fix ``no_fnmatch_line`` when used after positive matching.

changelog/6255.bugfix.rst

@@ -0,0 +1,3 @@
+Clear the ``sys.last_traceback``, ``sys.last_type`` and ``sys.last_value``
+attributes by deleting them instead of setting them to ``None``. This better
+matches the behaviour of the Python standard library.

changelog/README.rst

@@ -1,12 +1,14 @@
 This directory contains "newsfragments" which are short files that contain a small **ReST**-formatted
 text that will be added to the next ``CHANGELOG``.
 
-The ``CHANGELOG`` will be read by users, so this description should be aimed to pytest users
+The ``CHANGELOG`` will be read by **users**, so this description should be aimed to pytest users
 instead of describing internal changes which are only relevant to the developers.
 
-Make sure to use full sentences with correct case and punctuation, for example::
+Make sure to use full sentences in the **past or present tense** and use punctuation, examples::
 
-    Fix issue with non-ascii messages from the ``warnings`` module.
+    Improved verbose diff output with sequences.
+
+    Terminal summary statistics now use multiple colors.
 
 Each file should be named like ``<ISSUE>.<TYPE>.rst``, where
 ``<ISSUE>`` is an issue number, and ``<TYPE>`` is one of:

doc/5934.feature.rst

@@ -1 +0,0 @@
-``repr`` of ``ExceptionInfo`` objects has been improved to honor the ``__repr__`` method of the underlying exception.

doc/en/announce/release-2.0.0.rst

@@ -7,7 +7,7 @@ see below for summary and detailed lists.  A lot of long-deprecated code
 has been removed, resulting in a much smaller and cleaner
 implementation.  See the new docs with examples here:
 
-    http://pytest.org/2.0.0/index.html
+    http://pytest.org/en/latest/index.html
 
 A note on packaging: pytest used to part of the "py" distribution up
 until version py-1.3.4 but this has changed now:  pytest-2.0.0 only
@@ -36,12 +36,12 @@ New Features
 
     import pytest ; pytest.main(arglist, pluginlist)
 
-  see http://pytest.org/2.0.0/usage.html for details.
+  see http://pytest.org/en/latest/usage.html for details.
 
 - new and better reporting information in assert expressions
   if comparing lists, sequences or strings.
 
-  see http://pytest.org/2.0.0/assert.html#newreport
+  see http://pytest.org/en/latest/assert.html#newreport
 
 - new configuration through ini-files (setup.cfg or tox.ini recognized),
   for example::
@@ -50,7 +50,7 @@ New Features
     norecursedirs = .hg data*  # don't ever recurse in such dirs
     addopts = -x --pyargs      # add these command line options by default
 
-  see http://pytest.org/2.0.0/customize.html
+  see http://pytest.org/en/latest/customize.html
 
 - improved standard unittest support.  In general py.test should now
   better be able to run custom unittest.TestCases like twisted trial

doc/en/announce/release-2.0.1.rst

@@ -57,7 +57,7 @@ Changes between 2.0.0 and 2.0.1
 - refinements to "collecting" output on non-ttys
 - refine internal plugin registration and --traceconfig output
 - introduce a mechanism to prevent/unregister plugins from the
-  command line, see http://pytest.org/latest/plugins.html#cmdunregister
+  command line, see http://pytest.org/en/latest/plugins.html#cmdunregister
 - activate resultlog plugin by default
 - fix regression wrt yielded tests which due to the
   collection-before-running semantics were not

doc/en/announce/release-2.2.0.rst

@@ -9,7 +9,7 @@ with these improvements:
 
   - new @pytest.mark.parametrize decorator to run tests with different arguments
   - new metafunc.parametrize() API for parametrizing arguments independently
-  - see examples at http://pytest.org/latest/example/parametrize.html
+  - see examples at http://pytest.org/en/latest/example/parametrize.html
   - NOTE that parametrize() related APIs are still a bit experimental
     and might change in future releases.
 
@@ -18,7 +18,7 @@ with these improvements:
   - "-m markexpr" option for selecting tests according to their mark
   - a new "markers" ini-variable for registering test markers for your project
   - the new "--strict" bails out with an error if using unregistered markers.
-  - see examples at http://pytest.org/latest/example/markers.html
+  - see examples at http://pytest.org/en/latest/example/markers.html
 
 * duration profiling: new "--duration=N" option showing the N slowest test
   execution or setup/teardown calls. This is most useful if you want to
@@ -78,7 +78,7 @@ Changes between 2.1.3 and 2.2.0
   or through plugin hooks.  Also introduce a "--strict" option which
   will treat unregistered markers as errors
   allowing to avoid typos and maintain a well described set of markers
-  for your test suite.  See examples at http://pytest.org/latest/mark.html
+  for your test suite.  See examples at http://pytest.org/en/latest/mark.html
   and its links.
 - issue50: introduce "-m marker" option to select tests based on markers
   (this is a stricter and more predictable version of "-k" in that "-m"

doc/en/announce/release-2.3.0.rst

@@ -13,12 +13,12 @@ re-useable fixture design.
 
 For detailed info and tutorial-style examples, see:
 
-    http://pytest.org/latest/fixture.html
+    http://pytest.org/en/latest/fixture.html
 
 Moreover, there is now support for using pytest fixtures/funcargs with
 unittest-style suites, see here for examples:
 
-    http://pytest.org/latest/unittest.html
+    http://pytest.org/en/latest/unittest.html
 
 Besides, more unittest-test suites are now expected to "simply work"
 with pytest.
@@ -29,11 +29,11 @@ pytest-2.2.4.
 
 If you are interested in the precise reasoning (including examples) of the
 pytest-2.3 fixture evolution, please consult
-http://pytest.org/latest/funcarg_compare.html
+http://pytest.org/en/latest/funcarg_compare.html
 
 For general info on installation and getting started:
 
-    http://pytest.org/latest/getting-started.html
+    http://pytest.org/en/latest/getting-started.html
 
 Docs and PDF access as usual at:
 
@@ -94,7 +94,7 @@ Changes between 2.2.4 and 2.3.0
 - pluginmanager.register(...) now raises ValueError if the
   plugin has been already registered or the name is taken
 
-- fix issue159: improve http://pytest.org/latest/faq.html
+- fix issue159: improve http://pytest.org/en/latest/faq.html
   especially with respect to the "magic" history, also mention
   pytest-django, trial and unittest integration.
 

doc/en/announce/release-2.3.4.rst

@@ -16,7 +16,7 @@ comes with the following fixes and features:
 - yielded test functions will now have autouse-fixtures active but
   cannot accept fixtures as funcargs - it's anyway recommended to
   rather use the post-2.0 parametrize features instead of yield, see:
-  http://pytest.org/latest/example/parametrize.html
+  http://pytest.org/en/latest/example/parametrize.html
 - fix autouse-issue where autouse-fixtures would not be discovered
   if defined in an a/conftest.py file and tests in a/tests/test_some.py
 - fix issue226 - LIFO ordering for fixture teardowns

doc/en/announce/release-2.4.0.rst

@@ -7,7 +7,7 @@ from a few supposedly very minor incompatibilities.  See below for
 a full list of details.  A few feature highlights:
 
 - new yield-style fixtures `pytest.yield_fixture
-  <http://pytest.org/latest/yieldfixture.html>`_, allowing to use
+  <http://pytest.org/en/latest/yieldfixture.html>`_, allowing to use
   existing with-style context managers in fixture functions.
 
 - improved pdb support: ``import pdb ; pdb.set_trace()`` now works

doc/en/announce/release-2.7.0.rst

@@ -52,7 +52,7 @@ holger krekel
 - add ability to set command line options by environment variable PYTEST_ADDOPTS.
 
 - added documentation on the new pytest-dev teams on bitbucket and
-  github.  See https://pytest.org/latest/contributing.html .
+  github.  See https://pytest.org/en/latest/contributing.html .
   Thanks to Anatoly for pushing and initial work on this.
 
 - fix issue650: new option ``--docttest-ignore-import-errors`` which

doc/en/announce/release-2.9.0.rst

@@ -131,7 +131,7 @@ The py.test Development Team
   with same name.
 
 
-.. _`traceback style docs`: https://pytest.org/latest/usage.html#modifying-python-traceback-printing
+.. _`traceback style docs`: https://pytest.org/en/latest/usage.html#modifying-python-traceback-printing
 
 .. _#1422: https://github.com/pytest-dev/pytest/issues/1422
 .. _#1379: https://github.com/pytest-dev/pytest/issues/1379

doc/en/conf.py

@@ -92,7 +92,7 @@ exclude_patterns = [
 
 
 # The reST default role (used for this markup: `text`) to use for all documents.
-# default_role = None
+default_role = "literal"
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
 # add_function_parentheses = True
@@ -112,6 +112,19 @@ pygments_style = "sphinx"
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
 
+# A list of regular expressions that match URIs that should not be checked when
+# doing a linkcheck.
+linkcheck_ignore = [
+    "https://github.com/numpy/numpy/blob/master/doc/release/1.16.0-notes.rst#new-deprecations",
+    "https://blogs.msdn.microsoft.com/bharry/2017/06/28/testing-in-a-cloud-delivery-cadence/",
+    "http://pythontesting.net/framework/pytest-introduction/",
+    r"https://github.com/pytest-dev/pytest/issues/\d+",
+    r"https://github.com/pytest-dev/pytest/pull/\d+",
+]
+
+# The number of worker threads to use when checking links (default=5).
+linkcheck_workers = 5
+
 
 # -- Options for HTML output ---------------------------------------------------
 

doc/en/fixture.rst

@@ -9,9 +9,9 @@ pytest fixtures: explicit, modular, scalable
 
 
 
-.. _`xUnit`: http://en.wikipedia.org/wiki/XUnit
+.. _`xUnit`: https://en.wikipedia.org/wiki/XUnit
-.. _`purpose of test fixtures`: http://en.wikipedia.org/wiki/Test_fixture#Software
+.. _`purpose of test fixtures`: https://en.wikipedia.org/wiki/Test_fixture#Software
-.. _`Dependency injection`: http://en.wikipedia.org/wiki/Dependency_injection
+.. _`Dependency injection`: https://en.wikipedia.org/wiki/Dependency_injection
 
 The `purpose of test fixtures`_ is to provide a fixed baseline
 upon which tests can reliably and repeatedly execute.   pytest fixtures

doc/en/projects.rst

@@ -73,7 +73,6 @@ Some organisations using pytest
 
 * `Square Kilometre Array, Cape Town <http://ska.ac.za/>`_
 * `Some Mozilla QA people <http://www.theautomatedtester.co.uk/blog/2011/pytest_and_xdist_plugin.html>`_ use pytest to distribute their Selenium tests
-* `Tandberg <http://www.tandberg.com/>`_
 * `Shootq <http://web.shootq.com/>`_
 * `Stups department of Heinrich Heine University Duesseldorf <http://www.stups.uni-duesseldorf.de/projects.php>`_
 * cellzome

doc/en/talks.rst

@@ -64,7 +64,7 @@ Talks and blog postings
 - `pytest introduction from Brian Okken (January 2013)
   <http://pythontesting.net/framework/pytest-introduction/>`_
 
-- pycon australia 2012 pytest talk from Brianna Laugher (`video <http://www.youtube.com/watch?v=DTNejE9EraI>`_, `slides <http://www.slideshare.net/pfctdayelise/funcargs-other-fun-with-pytest>`_, `code <https://gist.github.com/3386951>`_)
+- pycon australia 2012 pytest talk from Brianna Laugher (`video <http://www.youtube.com/watch?v=DTNejE9EraI>`_, `slides <https://www.slideshare.net/pfctdayelise/funcargs-other-fun-with-pytest>`_, `code <https://gist.github.com/3386951>`_)
 - `pycon 2012 US talk video from Holger Krekel <http://www.youtube.com/watch?v=9LVqBQcFmyw>`_
 
 - `monkey patching done right`_ (blog post, consult `monkeypatch plugin`_ for up-to-date API)

scripts/release.py

@@ -79,12 +79,19 @@ def fix_formatting():
     call(["pre-commit", "run", "--all-files"])
 
 
+def check_links():
+    """Runs sphinx-build to check links"""
+    print(f"{Fore.CYAN}[generate.check_links] {Fore.RESET}Checking links")
+    check_call(["tox", "-e", "docs-checklinks"])
+
+
 def pre_release(version):
     """Generates new docs, release announcements and creates a local tag."""
     announce(version)
     regen()
     changelog(version, write_out=True)
     fix_formatting()
+    check_links()
 
     msg = "Preparing release version {}".format(version)
     check_call(["git", "commit", "-a", "-m", msg])

src/_pytest/pytester.py

@@ -1438,8 +1438,10 @@ class LineMatcher:
                     self._log("{:>{width}}".format("and:", width=wnick), repr(nextline))
                 extralines.append(nextline)
             else:
-                self._log("remains unmatched: {!r}".format(line))
+                msg = "remains unmatched: {!r}".format(line)
-                pytest.fail(self._log_text.lstrip())
+                self._log(msg)
+                self._fail(msg)
+        self._log_output = []
 
     def no_fnmatch_line(self, pat):
         """Ensure captured lines do not match the given pattern, using ``fnmatch.fnmatch``.
@@ -1465,18 +1467,21 @@ class LineMatcher:
         __tracebackhide__ = True
         nomatch_printed = False
         wnick = len(match_nickname) + 1
-        try:
+        for line in self.lines:
-            for line in self.lines:
+            if match_func(line, pat):
-                if match_func(line, pat):
+                msg = "{}: {!r}".format(match_nickname, pat)
-                    self._log("%s:" % match_nickname, repr(pat))
+                self._log(msg)
-                    self._log("{:>{width}}".format("with:", width=wnick), repr(line))
+                self._log("{:>{width}}".format("with:", width=wnick), repr(line))
-                    pytest.fail(self._log_text.lstrip())
+                self._fail(msg)
-                else:
+            else:
-                    if not nomatch_printed:
+                if not nomatch_printed:
-                        self._log(
+                    self._log("{:>{width}}".format("nomatch:", width=wnick), repr(pat))
-                            "{:>{width}}".format("nomatch:", width=wnick), repr(pat)
+                    nomatch_printed = True
-                        )
+                self._log("{:>{width}}".format("and:", width=wnick), repr(line))
-                        nomatch_printed = True
+        self._log_output = []
-                    self._log("{:>{width}}".format("and:", width=wnick), repr(line))
+
-        finally:
+    def _fail(self, msg):
-            self._log_output = []
+        __tracebackhide__ = True
+        log_text = self._log_text
+        self._log_output = []
+        pytest.fail(log_text)

src/_pytest/runner.py

@@ -121,7 +121,12 @@ def pytest_runtest_setup(item):
 
 def pytest_runtest_call(item):
     _update_current_test_var(item, "call")
-    sys.last_type, sys.last_value, sys.last_traceback = (None, None, None)
+    try:
+        del sys.last_type
+        del sys.last_value
+        del sys.last_traceback
+    except AttributeError:
+        pass
     try:
         item.runtest()
     except Exception:

testing/test_pytester.py

@@ -530,7 +530,7 @@ def test_no_matching(function):
             ]
         else:
             assert obtained == [
-                "nomatch: '{}'".format(good_pattern),
+                " nomatch: '{}'".format(good_pattern),
                 "     and: 'cachedir: .pytest_cache'",
                 "     and: 'collecting ... collected 1 item'",
                 "     and: ''",
@@ -542,6 +542,14 @@ def test_no_matching(function):
     func(bad_pattern)  # bad pattern does not match any line: passes
 
 
+def test_no_matching_after_match():
+    lm = LineMatcher(["1", "2", "3"])
+    lm.fnmatch_lines(["1", "3"])
+    with pytest.raises(pytest.fail.Exception) as e:
+        lm.no_fnmatch_line("*")
+    assert str(e.value).splitlines() == ["fnmatch: '*'", "   with: '1'"]
+
+
 def test_pytester_addopts(request, monkeypatch):
     monkeypatch.setenv("PYTEST_ADDOPTS", "--orig-unused")
 

testing/test_runner.py

@@ -900,9 +900,9 @@ def test_store_except_info_on_error():
     # The next run should clear the exception info stored by the previous run
     ItemMightRaise.raise_error = False
     runner.pytest_runtest_call(ItemMightRaise())
-    assert sys.last_type is None
+    assert not hasattr(sys, "last_type")
-    assert sys.last_value is None
+    assert not hasattr(sys, "last_value")
-    assert sys.last_traceback is None
+    assert not hasattr(sys, "last_traceback")
 
 
 def test_current_test_env_var(testdir, monkeypatch):

tox.ini

@@ -15,6 +15,7 @@ envlist =
     doctesting
     py37-freeze
     docs
+    docs-checklinks
 
 [testenv]
 commands =
@@ -63,6 +64,14 @@ deps = -r{toxinidir}/doc/en/requirements.txt
 commands =
     sphinx-build -W -b html . _build
 
+[testenv:docs-checklinks]
+basepython = python3
+usedevelop = True
+changedir = doc/en
+deps = -r{toxinidir}/doc/en/requirements.txt
+commands =
+    sphinx-build -W -q --keep-going -b linkcheck . _build
+
 [testenv:doctesting]
 basepython = python3
 skipsdist = True