cim_summary/.planning/milestones/v1.0-phases/01-data-foundation/01-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
01-data-foundation	02	testing	vitest supabase mocking unit-tests health-checks alert-events	phase provides 01-data-foundation/01-01 HealthCheckModel and AlertEventModel classes with getSupabaseServiceClient usage	Unit tests for HealthCheckModel covering all CRUD methods and input validation Unit tests for AlertEventModel covering all CRUD methods, status transitions, and input validation Supabase chainable mock pattern for future model tests INFR-04 compliance verification (models call getSupabaseServiceClient per invocation)	02-monitoring-services future model tests	added patterns Supabase chainable mock: makeSupabaseChain() helper with fluent vi.fn() returns and thenability for awaitable queries vi.mock hoisting: factory functions use only inline vi.fn() to avoid temporal dead zone errors vi.mocked() for typed access to mocked module exports after import	created modified backend/src/__tests__/models/HealthCheckModel.test.ts backend/src/__tests__/models/AlertEventModel.test.ts	Supabase mock uses thenability (chain.then) so both .single() and direct await patterns work without duplicating mocks makeSupabaseChain() factory encapsulates mock setup — one call per test, no shared state between tests vi.mock() factories use only inline vi.fn() — no top-level variable references to avoid hoisting TDZ errors	Model test pattern: vi.mock both supabase and logger, import vi.mocked() typed refs, makeSupabaseChain() per test, clearAllMocks in beforeEach Validation test pattern: verify getSupabaseServiceClient not called when validation throws (confirms no DB hit) PGRST116 null return: mock error.code = 'PGRST116' to test no-rows path that returns null instead of throwing	INFR-01 INFR-04	26min	2026-02-24

Phase 01 Plan 02: Model Unit Tests Summary

33 unit tests for HealthCheckModel and AlertEventModel with Vitest + Supabase chainable mock pattern

Performance

• Duration: 26 min
• Started: 2026-02-24T16:46:26Z
• Completed: 2026-02-24T17:13:22Z
• Tasks: 2
• Files modified: 2

Accomplishments

• HealthCheckModel: 14 tests covering create (valid/minimal/probe_details), 2 validation error paths, Supabase error + error logging, findLatestByService (found/null PGRST116), findAll (default limit/filtered/custom limit), deleteOlderThan (date calculation/count)
• AlertEventModel: 19 tests covering create (valid/default status/explicit status/details JSONB), 3 validation error paths, Supabase error, findActive (all/filtered/empty), acknowledge/resolve (success + PGRST116 not-found), findRecentByService (found/null), deleteOlderThan
• Established makeSupabaseChain() helper pattern for all future model tests — single source for mock client setup with fluent chain and thenable resolution
• Full test suite (41 tests) passes with no regressions

Task Commits

Each task was committed atomically:

1. Task 1: Create HealthCheckModel unit tests - 99c6dcb (test)
2. Task 2: Create AlertEventModel unit tests - a3cd82b (test)

Plan metadata: (docs commit to follow)

Files Created/Modified

• backend/src/__tests__/models/HealthCheckModel.test.ts - 14 unit tests for HealthCheckModel CRUD, validation, and error handling
• backend/src/__tests__/models/AlertEventModel.test.ts - 19 unit tests for AlertEventModel CRUD, status transitions, validation, and error handling

Decisions Made

• Supabase mock uses chain.then (thenability) so both .single() and direct await query patterns work from the same mock object — no need to bifurcate mocks for the two query termination patterns the models use.
• makeSupabaseChain(resolvedValue) factory creates a fresh mock per test — avoids state leakage between tests that would occur with a shared top-level mock object.
• vi.mock() factories use only inline vi.fn() — top-level variable references are in temporal dead zone when hoisted factories execute.

Deviations from Plan

1. [Rule 1 - Bug] Fixed Vitest hoisting TDZ error in initial mock approach

• Found during: Task 1 (first test run)
• Issue: Initial approach created top-level mock variables, then referenced them inside vi.mock() factory — Vitest hoists vi.mock before variable initialization, causing ReferenceError: Cannot access 'mockGetSupabaseServiceClient' before initialization
• Fix: Rewrote mock factories to use only inline vi.fn(), then used vi.mocked() after imports to get typed references
• Files modified: backend/src/__tests__/models/HealthCheckModel.test.ts
• Verification: Tests ran successfully on second attempt; this pattern used for AlertEventModel from the start
• Committed in: 99c6dcb (Task 1 commit, updated file)

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Total deviations: 1 auto-fixed (Rule 1 — runtime error in test infrastructure) Impact on plan: Fix was required for tests to run. Resulted in a cleaner, idiomatic Vitest mock pattern.

Issues Encountered

• Vitest mock hoisting TDZ: the correct pattern is vi.mock() factory uses only vi.fn() inline, with vi.mocked() used post-import for typed access. Documented in patterns-established for all future test authors.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Both model classes verified correct through unit tests
• Supabase mock pattern established — Phase 2 service tests can reuse makeSupabaseChain() helper
• INFR-04 compliance confirmed: tests verify getSupabaseServiceClient is called per-method invocation
• Ready for Phase 2: monitoring services that depend on HealthCheckModel and AlertEventModel

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Phase: 01-data-foundation Completed: 2026-02-24