Stale SHA Validation Test in ValidateGuidesTaskSpec Causes Test Suite Failure

Open buildSrc/src/test/groovy/website/gradle/tasks/ValidateGuidesTaskSpec.groovy and review the stale SHA rejection test and the sha entry in VALID_MINIMAL. Run ./gradlew -p buildSrc test --tests "website.gradle.tasks.ValidateGuidesTaskSpec" before and after the cleanup; done means all eight tests pass and the fixture matches the current ValidateGuidesTask schema.

Description

In commit 35d2834c, the task VendorGuideTask and all dead sampleRef.sha fields were retired, and ValidateGuidesTask had its SHA_40_HEX regex and sampleRef.sha validation logic removed. However, the test method shape mode rejects a non-40-char SHA and the sha: entry in the VALID_MINIMAL fixture in buildSrc/src/test/groovy/website/gradle/tasks/ValidateGuidesTaskSpec.groovy were inadvertently left behind. Because ValidateGuidesTask no longer validates or rejects non-40-character SHAs, running the test suite causes ValidateGuidesTaskSpec to fail with WrongExceptionThrownError: Expected exception of type 'org.gradle.api.GradleException', but no exception was thrown.

Steps to Reproduce

1. Open a terminal in the root of the repository.
2. Run ./gradlew -p buildSrc test --tests "website.gradle.tasks.ValidateGuidesTaskSpec".
3. Inspect the test output.
4. See error: ValidateGuidesTaskSpec > shape mode rejects a non-40-char SHA FAILED.

Expected Behavior

The test suite in buildSrc should pass cleanly and accurately reflect the current schema rules of ValidateGuidesTask (where SHA is no longer validated).

Actual Behavior / Error Logs

ValidateGuidesTaskSpec > shape mode rejects a non-40-char SHA STANDARD_OUT
    [validateGuides] mode=shape: 1 guide(s) parsed, 0 SKIP-warned, 0 errors

ValidateGuidesTaskSpec > shape mode rejects a non-40-char SHA FAILED
    org.spockframework.runtime.WrongExceptionThrownError: Expected exception of type 'org.gradle.api.GradleException', but no exception was thrown
        at org.spockframework.lang.SpecInternals.checkExceptionThrown(SpecInternals.java:84)
        at org.spockframework.lang.SpecInternals.thrownImpl(SpecInternals.java:67)
        at website.gradle.tasks.ValidateGuidesTaskSpec.shape mode rejects a non-40-char SHA(ValidateGuidesTaskSpec.groovy:68)

8 tests completed, 1 failed

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':test'.
> There were failing tests. See the report at: file:///D:/grails-static-website/buildSrc/build/reports/tests/test/index.html