Smart Connections AVA and Migration Harness

Use this skill when adding or updating focused Smart Connections regression coverage for utilities or migrations, especially when you need fixture-driven AVA tests and idempotent migration checks.

Critical

• Keep the test file next to the code under test:
  • src/utils/build_connections_codeblock.test.js for utility regressions
  • migrations/migrate_hidden_connections.test.js for migration regressions
• Import Ava with import test from 'ava'; and import the subject with an explicit .js extension.
• Always cover:
  • the happy path
  • a no-op path (undefined, empty object/array, already-migrated input)
  • nested object assertions with t.deepEqual
• Migration tests must verify idempotency: running the migration twice should return the same shape the second time.
• Do not use snapshots or integration-style demos here. This skill is for isolated regression coverage only.