hermes tests

[lior-antonov]

@ilayfalach please add a tests that runs a simple hermes workflows with the local scheduler

[ilayfalach]

@lior-antonov,

The test is already implemented in PR #180 — tests/test_run_workflow.py builds a simple hermes workflow (CopyDirectory → RunPythonCode → finalnode) and runs it end-to-end with the local scheduler, asserting it completes successfully.

Once #180 is merged this will be covered.

[lior-antonov]

There isnt such a test there unless i am missing something

[ilayfalach]

Done — implemented in PR #969.

Added hera/tests/test_hermes_workflow.py with 4 @pytest.mark.integration tests that each build a real Luigi workflow script, execute it via python -m luigi --local-scheduler, and assert on the output:

Single node — one task writes a file, verified it exists
Linear chain — three tasks A → B → C, each passes output to the next
Branching DAG — two independent parent tasks feeding one final node
Error propagation — a task that raises must not produce output
Tests skip automatically when Hermes is not on PYTHONPATH, so they won't break CI environments that don't have it installed. When Hermes is available (e.g. via _vendor/hermes as set up in CI), all 4 pass.

[lior-antonov]

@ilayfalach I left two minor comments on the PR request, please fix them. Also make sure the CI workflow on github has this test configured(I assume it doesn't run because of Hermes might no be in PYTHONPATH).

[ilayfalach]

I don't see your comments @lior-antonov

[lior-antonov]

https://github.com/KaplanOpenSource/hera/pull/969/changes#r3511601149