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## What Step 4 of the SQL editor testability plan: **mock-free hook tests** for the extracted SQL editor hooks, built on the Step 3 renderHook harness (`tests/lib/sql-editor-test-utils.tsx`) — in-memory editor port + real valtio stores + MSW. **Zero `vi.mock`.** | File | Tests | Covers | |------|-------|--------| | `useSqlEditorExecution.test.tsx` | 8 | destructive-query gating (`potentialIssues` vs. forced run), auto-limit suffixing, connection-string → `x-connection-encrypted` header, `onSuccess`/`onError` session-store writes, error-line highlight, diff-open short-circuit | | `useSqlEditorAi.test.tsx` | 7 | one-shot diff-request drain (empty vs. non-empty editor), drain-exactly-once across remounts, accept/discard diff, `onDebug` opening the assistant chat + debug prompt | | `usePrettifyQuery.test.tsx` | 2 | in-place format + write-back, diff-open no-op | | `useSnippetIdentity.test.tsx` | 2 | generated identity + store-driven loading state | | `useSnippetTitleGenerator.test.tsx` | 2 | untitled-snippet naming via the title endpoint | Every test exercises real dependencies at the seam where they're real: network via MSW, stores used real and reset per test, Monaco via the in-memory editor port. ## Test plan - [x] `pnpm test:studio -- SQLEditor` → **286/286 passing** (21 new tests included) - [x] `pnpm --filter studio typecheck` clean - [x] Confirmed zero `vi.mock` in the new files <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Tests** * Added comprehensive automated coverage for SQL query formatting, snippet identity, and AI-generated titles. * Added coverage for AI-assisted SQL editing, including diff acceptance, rejection, debugging, and request handling. * Added coverage for query execution, result persistence, safety checks, replica selection, error highlighting, and diff-state behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai -->