Test Helper Boundary

This directory holds shared channel test helpers used by core and bundled plugin tests.

Bundled Plugin Imports

Core test helpers in this directory must not hardcode repo-relative imports into extensions/**.
When a helper needs a bundled plugin public/test surface, go through src/test-utils/bundled-plugin-public-surface.ts.
Prefer loadBundledPluginTestApiSync(...) for eager access to exported test helpers.
Prefer resolveRelativeBundledPluginPublicModuleId(...) when a test needs a module id for dynamic import or mocking.
If vi.mock(...) hoisting would evaluate the module id too early, use vi.doMock(...) with the resolved module id instead of falling back to a hardcoded path.

Keep shared test helpers aligned with the same public/plugin boundary that production code uses.
Avoid drift where core test helpers start reaching into bundled plugin private files by path because it is convenient in one test.