AssertionError not showing diff (even with -vv)

[carygravel]

• a detailed description of the bug or problem you are having

In creating conda environments on a new machine, I have one project where

a = 1
b = 2
assert a == b

does not show the diff output. The diff works fine an another copy of the environment.

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

Package               Version
--------------------- -------------------
absl-py               0.12.0
astroid               2.3.3
atomicwrites          1.4.0
attrs                 20.3.0
certifi               2020.6.20
click                 7.1.2
colorama              0.4.4
deepdiff              5.5.0
Flask                 1.1.1
hypothesis            5.41.0
importlib-metadata    2.0.0
isort                 4.3.21
itsdangerous          1.1.0
Jinja2                2.11.2
lazy-object-proxy     1.5.1
MarkupSafe            1.1.1
mccabe                0.6.1
mkl-fft               1.2.0
mkl-random            1.1.1
mkl-service           2.3.0
more-itertools        8.5.0
multipledispatch      0.6.0
numpy                 1.19.2
ordered-set           4.0.2
ortools               8.2.8710
packaging             20.4
pandas                1.0.3
pip                   20.2.4
pluggy                0.13.1
pprintpp              0.4.0
protobuf              3.17.3
psutil                5.7.2
py                    1.9.0
pylint                2.4.4
pyparsing             2.4.7
pytest                5.4.1
pytest-arraydiff      0.3
pytest-astropy        0.8.0
pytest-astropy-header 0.1.2
pytest-diff           0.1.14
pytest-doctestplus    0.8.0
pytest-openfiles      0.5.0
pytest-remotedata     0.3.2
pytest-runner         5.2
python-dateutil       2.8.1
python-dotenv         0.13.0
pytz                  2020.1
setuptools            50.3.1.post20201107
six                   1.15.0
sortedcontainers      2.2.2
wcwidth               0.2.5
Werkzeug              1.0.1
wheel                 0.35.1
wincertstore          0.2
wrapt                 1.12.1
zipp                  3.4.0

• pytest and operating system versions

pytest 5.4.1, Win10, whereby, as I said I have another Win10 machine with pytest 5.4.1 where this all works fine, so I assume this is a subtle problem somewhere else.

• minimal example if possible

[The-Compiler]

In which file is the code? Can you show the full output?

[carygravel]

(D:\myproj\env) D:\myproj>pytest src\test.py -vv -k test_build_jobs
=========================================================================================================== test session starts ============================================================================================================
platform win32 -- Python 3.7.1, pytest-5.4.1, py-1.9.0, pluggy-0.13.1 -- D:\myproj\env\python.exe
cachedir: .pytest_cache
rootdir: D:\myproj
plugins: arraydiff-0.3
collected 7 items / 6 deselected / 1 selected
 
src/test.py::test_build_jobs FAILED                                                                                                                                                                                                   [100%]
 
================================================================================================================= FAILURES =================================================================================================================
_____________________________________________________________________________________________________________ test_build_jobs ______________________________________________________________________________________________________________
 
    def test_build_jobs():
        """ basic tests for build_features.build_jobs """
        a = 1
        b = 2
>       assert a == b
E       AssertionError
 
src\test.py:90: AssertionError
========================================================================================================= short test summary info ==========================================================================================================
FAILED src/test.py::test_build_jobs - AssertionError
===================================================================================================== 1 failed, 6 deselected in 0.76s ======================================================================================================

[The-Compiler]

does anything change if you name your file test_something.py? What about -p no:arraydiff? Finally, please test with a newer pytest version - 5.4.1 is over a year old and not supported anymore.

[carygravel]

does anything change if you name your file test_something.py?

Yup. That fixed it. The weird thing is that in the old environment with the same versions, it all worked fine as just test.py.

Thanks for the help.