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fill: plain pytest test in a fixture directory crashes collection with INTERNALERROR #3608
Description
A test function under tests/ that does not request state_test/blockchain_test/transaction_test makes fill abort during collection instead of being skipped or reported.
Reproduce: add a file tests/frontier/mpt/test_probe.py containing def test_x(): assert True, then run uv run fill tests/frontier/mpt/ --fork Osaka.
Result: INTERNALERROR> ValueError: No spec type format found in the test item. raised from packages/testing/src/execution_testing/cli/pytest_commands/plugins/filler/filler.py in pytest_collection_modifyitems at the get_spec_format_for_item(params) call. No tests run.
Expected: either the item is deselected with a clear message, or collection fails with an actionable error naming the offending test.
Context: found while adding a helper self-check next to tests/frontier/mpt/ (PR #3600). Workaround used there: run the check at import time from a non-test_ module.
Activity
CodeTrainerMan commentedon Sep 21, 2026
Hi @CPerezz, I'd like to take this one.
Plan: in
pytest_collection_modifyitems(filler.py), detect test items collected undertests/that request no spec type (state_test/blockchain_test/transaction_test) and deselect them with an actionable message naming the offending test, instead of lettingget_spec_format_for_item()raiseValueErrorthat pytest reports asINTERNALERROR.Opening a PR shortly.
fix(test-fill): fail collection of tests without a spec fixture (ethe…
fix(test-fill): fail collection of tests without a spec fixture (#3672)