--tb=line -> giving a trace back

[kevindawson]

• [x ] a detailed description of the bug or suggestion
  Whilst working my way through "Python Testing with pytest"

the issue is the use of --tb=line

• [x ] output of pip list from the virtual environment you are using

(code) kevin@donkey:~/SandBox/code/ch4/cache$ pip list
Package           Version Location
----------------- ------- ---------------------------------------
astroid           2.4.2
atomicwrites      1.4.0
attrs             20.2.0
click             7.1.2
colorama          0.4.3
coverage          5.2.1
crayons           0.4.0
Cython            0.29.21
icdiff            1.9.1
iniconfig         1.0.1
isort             5.4.2
lazy-object-proxy 1.4.3
mccabe            0.6.1
mongo             0.2.0
more-itertools    8.5.0
packaging         20.4
pip               20.2.2
pluggy            0.13.1
pprintpp          0.4.0
py                1.9.0
pylint            2.6.0
pymongo           3.11.0
pyparsing         2.4.7
pytest            6.0.1
pytest-cov        2.10.1
pytest-icdiff     0.5
pytest-mock       3.3.1
setuptools        49.2.0
six               1.15.0
tasks             0.1.0   /home/kevin/SandBox/code/tasks_proj/src
tinydb            4.1.1
toml              0.10.1
wheel             0.34.2
wrapt             1.12.1

• [x ] pytest and operating system versions

pytest 6.0.1
Python 3.8.2
Linux donkey 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

• [x ] minimal example if possible
  test_slower.py

import datetime
import pytest
import random
import time


@pytest.fixture(autouse=True)
def check_duration(request, cache):
    key = "duration/" + request.node.nodeid.replace(":", "_")
    # nodeid's can have colons
    # keys become filenames within .cache
    # replace colons with something filename safe
    start_time = datetime.datetime.now()
    yield
    stop_time = datetime.datetime.now()
    this_duration = (stop_time - start_time).total_seconds()
    last_duration = cache.get(key, None)
    cache.set(key, this_duration)
    if last_duration is not None:
        errorstring = "test duration over 2x last duration"
        assert this_duration <= last_duration * 2, errorstring


@pytest.mark.parametrize("i", range(5))
def test_slow_stuff(i):
    time.sleep(random.random())

Output

(code) kevin@donkey:~/SandBox/code/ch4/cache$ pytest -q --tb=line test_slower.py
....E.                                                                                                                                                            [100%]
================================================================================ ERRORS =================================================================================
________________________________________________________________ ERROR at teardown of test_slow_stuff[3] ________________________________________________________________
Traceback (most recent call last):
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/config/__init__.py", line 180, in console_main
    code = main()
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/config/__init__.py", line 157, in main
    ret = config.hook.pytest_cmdline_main(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 208, in _multicall
    return outcome.get_result()
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 80, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/main.py", line 289, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/main.py", line 277, in wrap_session
    config.hook.pytest_sessionfinish(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 203, in _multicall
    gen.send(outcome)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/terminal.py", line 813, in pytest_sessionfinish
    self.config.hook.pytest_terminal_summary(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 208, in _multicall
    return outcome.get_result()
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 80, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/pluggy/callers.py", line 182, in _multicall
    next(gen)  # first yield
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/terminal.py", line 827, in pytest_terminal_summary
    self.summary_errors()
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/terminal.py", line 1032, in summary_errors
    self._outrep_summary(rep)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/terminal.py", line 1035, in _outrep_summary
    rep.toterminal(self._tw)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/reports.py", line 82, in toterminal
    longrepr.toterminal(out)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/_code/code.py", line 951, in toterminal
    element[0].toterminal(tw)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/_code/code.py", line 981, in toterminal
    entry.toterminal(tw)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/_code/code.py", line 1079, in toterminal
    self._write_entry_lines(tw)
  File "/home/kevin/.local/share/virtualenvs/code-PeIGB9Qw/lib/python3.8/site-packages/_pytest/_code/code.py", line 1048, in _write_entry_lines
    assert not seeing_failures, (
AssertionError: Unexpected failure lines between source lines:
E   AssertionError: test duration over 2x last duration
    assert 0.635612 <= (0.095207 * 2)
(code) kevin@donkey:~/SandBox/code/ch4/cache$ 

dodo-x hope this will suffice ;)

[nicoddemus]

Thanks @kevindawson for the report! This has been fixed by #7707 and should be out in 6.0.2 soon. 👍

[kevindawson]

thanks for the heads up @nicoddemus