Headless language tests could read an earlier, partial syntax tree after ensureSyntaxTree finished parsing, so highlight and state-based assertions depended on the initial 20 ms parse budget and failed intermittently under load. Shared test helpers now return the completed tree (or publish it to state), and every affected test uses them.
Co-authored-by: arnaud-ritti <[email protected]>
Root cause: jsdom has no layout and CodeMirror measures text ranges in an animation frame, sometimes after a test finished; test files that did not stub Range.getClientRects (e.g. search/codePreview) threw an unhandled TypeError that failed whole CI runs at random (seen on #41).
Fix: stub Range.getClientRects / getBoundingClientRect once in src/test/setup.ts; drop the six per-file copies.
Verified: vitest on editor/lsp, editor/refactor, templates, search (55 files, 458 tests, no unhandled errors).
Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn
Arnaud Ritti
l0ng-ai