Codex Report - 2025-10-08T23:55:27Z

Overview

Compared the pristine AA37 Department of Health.drawio fixture against the plugin-generated AA37 Department of Health-with-metadata.drawio artifact to isolate the exact structural differences.
Identified that metadata injection only affects the <mxfile> header, the root <mxGraphModel> dimensions, and replaces the root <mxCell id="0" /> with a metadata-bearing <UserObject> block containing preamble entries.

Added tests/utils/patchDrawioWithMetadata.ts to perform targeted textual transformations:
- Rewrote the <mxfile> element with caller-supplied host/agent/version values.
- Optionally retargeted the first <mxGraphModel> dx/dy dimensions without disturbing other attributes.
- Located the root <mxCell id="0" /> line and replaced it with an indented <UserObject> structure populated from declarative options (CSV path, base URI, preamble entries, optional label).
- Guarded each mutation with explicit existence checks so fixtures remained untouched when the expected anchors were absent.

Relocated the AA37 Department of Health-with-metadata.drawio artifact into the test fixtures directory so it can serve as a golden regression target alongside the original drawio file.

Introduced a Bun test that used the new utility to patch the pristine AA37 fixture and assert byte-for-byte equivalence with the relocated metadata artifact, confirming that the surgical transformations faithfully reproduced the runtime export at the time.
Executed bun install within src/main/webapp/plugins/rdfexport to ensure local dependencies (including @xmldom/xmldom) were present for the test suite.

The metadata patch utility preserves the pristine fixture by enforcing strict structural anchors and emitting DOM-driven updates, preventing accidental drift in unrelated sections of the document.

Replaced the earlier string-based transformer with an @xmldom/xmldom-driven implementation that walks the DrawIO DOM, constructs the metadata UserObject, and re-serializes the document while preserving existing whitespace anchors for consistent fixture formatting.
Simplified the metadata patch options so only the RDF-exported structures (preamble entries, CSV path, base URI, optional label) are touched; viewport adjustments and header rewrites are now intentionally ignored.
Updated the regression test to compare DOM structures instead of raw strings, explicitly asserting that the patched document inherits host/agent/dx/dy attributes from the pristine fixture while matching the metadata payload found in the runtime artifact.
Re-ran bun test src/main/webapp/plugins/rdfexport/tests/rdfexport.test.ts to confirm the DOM-based patch still recreates the RDF metadata layout without disturbing unrelated sections.

Streamlined rdfexport.test.ts so it now delegates entirely to patchDrawioWithMetadata, deriving patch inputs from the golden AA37 fixture and validating the patched output against the runtime artifact by comparing DOM snapshots of the injected metadata block.
Removed the bespoke DrawIO UI and graph stubs that had crept into the regression test, keeping the focus on the patcher contract and eliminating duplicated logic from the production plugin.
Verified again with bun test src/main/webapp/plugins/rdfexport/tests/rdfexport.test.ts that the simplified regression harness still confirms parity without mutating unrelated DrawIO attributes.

Restored the full rdfexport.test.ts suite so legacy UI and export safeguards remain under regression, keeping the new metadata patch validation additive rather than destructive.
Added a focused fixture patch test that imports patchDrawioWithMetadata, patches the pristine AA37 diagram, and compares the resulting metadata DOM against the golden artifact while ensuring header and viewport attributes remain untouched.
Re-ran bun test src/main/webapp/plugins/rdfexport/tests/rdfexport.test.ts to confirm all historical coverage passes alongside the new regression.