Huy Do 1cb935997c fix: fail loudly on an unknown workflow expression filter (#3074) ...

* fix: fail loudly on an unknown workflow expression filter

The expression evaluator's filter dispatch fell through to `return value`
for any unregistered filter, so a typo'd or unsupported filter such as
`{{ items | length }}` rendered the value unchanged with no error and the
run completed — a silent wrong result.

Raise a clear ValueError instead, naming the offending filter and the valid
ones, mirroring the strict handling already used for `from_json`. The five
registered filters (default/join/map/contains/from_json) are unchanged; the
`name(arg)` form of an unknown filter is now caught too.

* fix: distinguish a misused registered filter from an unknown one; cover map

Address the review feedback on the unknown-filter fail-loud path:

- A *registered* filter used in an unsupported form (e.g. `| join` or
  `| map` with no argument) raised the misleading "unknown filter
  '<name>'" — the filter is registered, the syntax isn't. It now raises
  a message naming it as a known filter misused. A new
  `_REGISTERED_FILTERS` constant drives the distinction.
- `test_registered_filters_unaffected` now also exercises `map('attr')`,
  which it previously claimed to cover but didn't. Add
  `test_registered_filter_unsupported_form_raises` to pin the new path.

* fix: include the no-arg default form in the filter-error hint

Copilot review: the hint listed default('x') but omitted the valid
no-argument default form (| default), which this module supports.

2026-06-22 10:44:23 -05:00

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