Schema-derived, property-based (fast-check) round-trip tests over flat
single-node ProseMirror documents. One test PR — src/ is untouched; the two
real bugs found are pinned as loud it.fails counterexamples, not fixed here.
- attr-arbitraries.ts: per-attribute four-state arbitraries (absent/default/
nonDefault/degenerate), attribute list sourced from schema.nodes[t].spec.attrs;
a documented override table supplies legal domains for constrained attrs and
distinguishes two frozen classes explicitly — ACCEPTED limitations (no md
representation) vs PINNED bugs (representable but dropped, tracked as
counterexamples).
- text-arbitraries.ts: hostile text corpus (ported from the existing property
test's supported-space guarantees).
- node-generators.ts: flat single-node generators + a completeness contract —
every one of the schema's 45 nodes / 12 marks is either generated or listed in
KNOWN_UNCOVERED with a reason.
- flat-roundtrip.property.test.ts: P1 (semantic round-trip via
docsCanonicallyEqual), P2 (second-pass byte fixpoint — anti GS-EDIT-REVERT),
P3 (totality), generator validity via schema.check(), and an explicit
attribute-value-coverage snapshot so the not-fuzzed set can never grow silently.
- counterexamples: column.width (% dropped on parseFloat -> P2 churn) and
orderedList.start (non-1 start renders as '1.' -> P1 loss) pinned as it.fails.
SEED=20250705, NUM_RUNS=300 per property; ~17s, no OOM (union arbitraries).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder