[tests] epub: skip the epubcheck test if Java or epubcheck itself are not found

[jayaddison]

Feature or Bugfix

• Bugfix

Purpose

• The test_run_epubcheck test has to be enabled explicitly by the environment setting the DO_EPUBCHECK variable. For the test to pass without indicating any problems when the test did not exercise any behaviour or check any results seems wrong - it could result in test reports that produce a false sense of confidence.

Detail

• Instead of reporting success when the test_run_epubcheck does nothing due to the apparent absense of either Java or epubcheck.jar on the host, use pytest to indicate a skip result.

Relates

• Relates to / discovered during investigation of tests: network state (online/offline) affects epubcheck unit test outcome. #12094 (but does not fix it).

[jayaddison]

Output when java is found not runnable on the host:

tests/test_builders/test_build_epub.py ..........s..                                                   [100%]

========================================== short test summary info ===========================================
SKIPPED [1] tests/test_builders/test_build_epub.py:382: Unable to run Java; skipping test
======================================= 12 passed, 1 skipped in 3.73s ========================================

Output when epubcheck.jar is found unavailable on the host:

tests/test_builders/test_build_epub.py ..........s..                                                   [100%]

========================================== short test summary info ===========================================
SKIPPED [1] tests/test_builders/test_build_epub.py:386: Could not find epubcheck; skipping test
======================================= 12 passed, 1 skipped in 3.85s ========================================

[picnixz]

Ah ! thank you ! I had this change in my huge re-implementation but forgot about it. So thanks for that.

[picnixz]

Thank you!

[jayaddison]

Thanks!