test(test-data): port lookup-interpolation, mixin-as-value & rootpath-escape-interpolation fixtures to alpha

[matthew-dean]

What this does

Three fixtures exist under packages/test-data on master but were missing from alpha. Since @less/test-data is a shared corpus consumed across branches (and by downstream compatibility suites), this ports them onto alpha so the corpus stays aligned:

Fixture	Covers
tests-unit/lookup-interpolation	[...] lookups inside @{…} interpolation — selectors, url(), at-rule name/prelude, property names, custom-property values, and the quoted/url silent-pass-through regressions
tests-error/eval/mixin-as-value	using a mixin call as a value is an error
tests-config/rootpath-escape-interpolation	rootpath combined with escaped-string interpolation

Alpha fixture gate

lookup-interpolation and mixin-as-value render / error as expected under the alpha fixture gate — the full pnpm --dir packages/less run test:alpha run stays green:

Less alpha fixtures passed: 89 rendered, 20 expected render failures, 81 friendly errors,
15 expected missing errors, 0 warnings, 2 expected missing warnings, 45 skipped.

rootpath-escape-interpolation exercises the rootpath option, which the alpha build does not support yet (validateAlphaOptions rejects it). It is added to the alpha-fixtures.mjs skip map next to the existing rootpath-rewrite-urls-* entries, with the same reason, so the fixture ships in the corpus without gating the alpha build. When rootpath support lands, removing that one skip line turns it into an active gate.

Notes

• The sibling extend/extend-clearfix.less and media-nested-type / property-interpolation-lookup fixtures from the same master range are intentionally not included here: extend-clearfix.less is an @import helper with no expected CSS, and the other two do not yet pass the alpha engine — they are tracked separately.

[coderabbitai]

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[greptile-apps]

Greptile Summary

This PR aligns the alpha branch’s shared test corpus with master by adding regression fixtures for lookup interpolation, mixin calls used as values, and rootpath escaping.

• Adds comprehensive lookup-interpolation input/output coverage.
• Adds an expected evaluation error for using a mixin call as a property value.
• Adds rootpath escaping coverage with fixture-specific options.
• Skips the rootpath fixture in the alpha gate until rootpath rewriting is supported.

Confidence Score: 5/5

The PR appears safe to merge because the added fixtures match master and the unsupported rootpath case is correctly excluded from the alpha gate.

No actionable failures remain; every fixture has its corresponding expectation, the ports match master, and the new skip entry follows the alpha runner’s exact discovery and filtering contract.

_{Reviews (1): Last reviewed commit: "test(test-data): port lookup-interpolati..." | Re-trigger Greptile}