v3.1.2 - test suite "frozen" after it finishes #15960
Description
Hello,
i'm preparing 3.1.2 for upload to Debian but i noticed something unusual: the test suite just stops when it finishes, and that blocks the execution of further build steps for Debian.
we run the tests like:
/usr/bin/xvfb-run -a python3.7 tests.py --no-network --verbose --full-trace
(exporting PYTHONPATH and MATPLOTLIBDATA accordingly)
the suite runs:
...
build/lib.linux-x86_64-3.7/matplotlib/tests/test_tightlayout.py::test_collapsed
/usr/lib/python3/dist-packages/_pytest/python.py:174: UserWarning: Tight layout not applied. The left and right margins cannot be made large enough to accommodate all axes decorations.
testfunction(**testargs)
build/lib.linux-x86_64-3.7/matplotlib/tests/test_ttconv.py::test_truetype_conversion[pdf]
/home/morph/deb/build-area/matplotlib-3.1.2/build/lib.linux-x86_64-3.7/matplotlib/backends/_backend_pdf_ps.py:62: RuntimeWarning: Glyph 108 missing from current font.
font.set_text(s, 0.0, flags=ft2font.LOAD_NO_HINTING)
build/lib.linux-x86_64-3.7/matplotlib/tests/test_ttconv.py::test_truetype_conversion[pdf]
/home/morph/deb/build-area/matplotlib-3.1.2/build/lib.linux-x86_64-3.7/matplotlib/backends/_backend_pdf_ps.py:62: RuntimeWarning: Glyph 112 missing from current font.
font.set_text(s, 0.0, flags=ft2font.LOAD_NO_HINTING)
-- Docs: https://docs.pytest.org/en/latest/warnings.html
12 failed, 7823 passed, 38 skipped, 2 deselected, 10 xfailed, 13 xpassed, 39 warnings, 14 error in 388.60 seconds
and then it just sits there forever.
is this a known issue? any idea how to debug/fix it? thanks!