Broken doctests (doctests not being run on CI)

[grlee77]

Description

In #5361 (comment) it was pointed out that the profile_line examples list incorrect outputs. Are we no longer running doctests on any CI job? I know that our unit tests are greatly preferable to doctests for testing purposes, but we should still be verifying that the given examples run as expected.

[grlee77]

The older tools/travis/before_install.sh TravisCI scripts set the option to run the doctests and tools/travis/script.sh used this when calling pytest.

tools/travis/before_install.sh:export TEST_ARGS="--doctest-modules --cov=skimage"
tools/travis/script.sh:(cd .. && pytest $TEST_ARGS --pyargs skimage)

The newer GHA tools/github/before_install.sh also sets this TEST_ARGS environment variable , but it does not seem to be used when calling pytest in any of the .github/workflows files and it is also used in tools/github/script.sh. I will have to inspect the CI logs to see if it shows up there

[grlee77]

I will open a PR to add this to the GHA workflow and fix any existing doctest failures that may have crept in.

[grlee77]

The underlying issue was that environment variables do not persist between GitHub Actions steps. There is a fix for this in #5505

[grlee77]

closed by #5505