[Debian-pan-maintainers] Bug#1010258: python3-pymca5: flaky autopkgtest on i386

[Julian Gilbey]

Package: python3-pymca5
Version: 5.7.1+dfsg-1
Severity: normal
X-Debbugs-Cc: Picca Frédéric-Emmanuel <picca at debian.org>

Uploading a new version of python3-qtconsole with only changes to the
autopkgtest suite (no changes to the python3 module at all) caused
those packages depending on it to be retested on the CI system.  One
of these is pymca, and it failed:
https://ci.debian.net/data/autopkgtest/testing/i386/p/pymca/21180621/log.gz
I tried running it locally and it passed fine, as it did with the
previous version of python3-qtconsole.  So it seems that this test is
flaky, at least with Python 3.10:

======================================================================
FAIL: testFullViewNumpy (McaStackViewTest.testMcaStackView)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/PyMca5/tests/McaStackViewTest.py", line 208, in testFullViewNumpy
    self._assertFullView(data)
  File "/usr/lib/python3/dist-packages/PyMca5/tests/McaStackViewTest.py", line 274, in _assertFullView
    numpy.testing.assert_array_equal(data[idxFull],
  File "/usr/lib/python3/dist-packages/numpy/testing/_private/utils.py", line 934, in assert_array_equal
    assert_array_compare(operator.__eq__, x, y, err_msg=err_msg,
  File "/usr/lib/python3/dist-packages/numpy/testing/_private/utils.py", line 844, in assert_array_compare
    raise AssertionError(msg)
AssertionError: 
Arrays are not equal

Mismatched elements: 1 / 1512 (0.0661%)
Max absolute difference: 4.54747351e-13
Max relative difference: 2.09568557e-16
 x: array([[[[1008.747835, 1009.708006, 1010.258788, ..., 1014.26906 ,
          1015.457929, 1016.341512],
         [1017.31171 , 1018.872885, 1019.41133 , ..., 1023.968694,...
 y: array([[[[1008.747835, 1009.708006, 1010.258788, ..., 1014.26906 ,
          1015.457929, 1016.341512],
         [1017.31171 , 1018.872885, 1019.41133 , ..., 1023.968694,...

----------------------------------------------------------------------

Unfortunately the output does not show which elements mismatched or
what their values were.

I don't know how best to proceed with a flaky test; I could re-upload
python3-qtconsole, but that doesn't seem like the best approach.  Or
perhaps this test could be marked as flaky or skipped on i386?  It
would be very good to resolve this, though, as it's one of the few
things blocking spyder from migrating to testing.

Thanks!

   Julian