test(project): Integration tests for custom-task determineBuildSignature - #1597
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…termineBuildSignature Verify that a custom task can implement and use the determineBuildSignature callback end-to-end via graph.build(): a stable callback return keeps the project cache intact, while a changed return invalidates it and forces a rebuild. The callback derives its signature from an on-disk control file so the test can flip the signature independently of any source-resource change.
…re staleness Capture the status quo: a running BuildServer computes each project's build signature exactly once (BuildContext memoizes the ProjectBuildContext for the server's lifetime), so a custom task's determineBuildSignature callback is never re-evaluated. Changing an input the callback reads (here an on-disk control file outside the watched source paths) while the server runs is therefore silently ignored, and the server keeps serving a stale build result. The new test asserts the desired behavior — the change is reflected without a server restart — and is marked test.failing since the current behavior does not do this. The build-signature custom task now also appends the control value to test.js so the served output observably depends on the callback input.
d3xter666
approved these changes
Sep 16, 2026
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Adds ProjectBuilder coverage for the callback invalidating the cache on change, plus a test.failing BuildServer test documenting that signatures go stale over the server's lifetime.
JIRA: CPOUI5FOUNDATION-1360