# Test-Specialist Agent — Persistent Memory

> **Persistent diary cross-session.** Auto-injected first ~200 lines at spawn (L1 HOT).
> Update BEFORE every stop. Tiered Memory v1: L1 HOT soft-cap ~30KB · L2 `archive/` on-demand · L3 RAG `search_memory` just-in-time. Keep entry ≤ 1.5K chars (gotcha #53).
> **NEW agent S39 (2026-05-29)** — dedicated test layer (tách khỏi implementer Case 3).

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## 🎯 Role baseline

WRITE specialist độc quyền `tests/**`. xUnit + FluentAssertions 7.2 + EF SQLite TestApplicationDbContext + IdentityFixture. Tools: Read, Edit, Write, Bash, Grep, Glob + 5 RAG. Skills: `contract-workflow` + `permission-matrix`.

## 🚫 Split boundary
- ✅ MINE: `tests/SolutionErp.{Domain,Infrastructure}.Tests/**`
- ❌ NOT: production code `src/Backend/**` + `fe-*/**` → test reveal bug → REPORT em main, KHÔNG fix
- ❌ NOT: decide WHAT to test (test plan) → em main + reviewer chốt priority

## 📊 Baseline 228 tests = 228 PASS (58 Domain + 170 Infra)  ← S56 +12 (2 LeaveBalance deduct-correctness + 4 Travel/Vehicle ApproveV2 smoke + 2 ItTicket existence-oracle + 4 DocxRenderer). Pre-S56 = 216.
Run: `dotnet test SolutionErp.slnx --nologo --verbosity minimal -p:BuildInParallel=false -maxcpucount:1` (MSBuild OOM → serialize build)

### ⚠️ Pattern: deduction hook FK → seed LeaveType cho terminal test (S43)
LeaveBalance → LeaveType `Restrict` FK. ApproveLeaveRequestHandler terminal branch (DaDuyet) insert LeaveBalance. Test đi tới DaDuyet PHẢI seed 1 LeaveType row + LeaveRequest.LeaveTypeId = type.Id (KHÔNG random Guid → FK fail SQLite Error 19). Non-terminal (advance/reject/return/OtRequest) KHÔNG cần (OtRequest no hook). BuildLeave thêm optional `leaveTypeId` default random (giữ test cũ non-terminal). Year = StartDate.Year. Negative allowed (no quota guard → Remaining<0 OK). Query lazy synth Entitled=DaysPerYear khi 0 row.

## ⏱️ Timing rules (docs/rules.md §7)
- Feature mới = test-after (UAT ổn → viết, Phase 9 skip per `feedback_uat_skip_verify`)
- Bug fix = test-before BẮT BUỘC (reproduce → fix)
- Critical algo = test-before merge (codegen/guard/financial/security)
- Skip: DTO mapping, CRUD master, FE snapshot

## 📋 Patterns proven (apply confidently)

### Pattern 10 Reflection authz regression (~50 LOC)
Catch class-level `[Authorize(Policy=...)]` regression: `typeof(Ctrl).GetCustomAttribute<AuthorizeAttribute>().Policy.Should().Be(...)`. KHÔNG WebApplicationFactory heavy. Cho gotcha #44 silent 403.

### Pattern 11 Test infra helper cookie-cutter
`SeedWorkflowAsync` (1 Step DepartmentId=null skip FK + 2 Levels) + `SeedApproversAsync` (N user fix.CreateUserAsync). Reusable PE/Contract/Proposal workflow test.

### Pattern 12 InternalsVisibleTo
Expose internal helper via `<InternalsVisibleTo Include="SolutionErp.Infrastructure.Tests" />` csproj.

### Spec drift detection BEFORE write (S34 lesson)
Test theo CODE (single source truth), document mismatch header comment + report. Vd soft-delete UNIQUE: code chặn opt-out → test theo code, flag drift.

### gotcha #48 SQLite tie-break
`OrderByDescending(CreatedAt).First()` pick wrong khi 2+ Add() cùng CreatedAt frozen-clock → discriminator filter `.Where(Summary.Contains("Chuyển phase"))` BEFORE OrderBy.

## 🎯 Coverage gap backlog (priority — Reviewer flagged S36)
1. ✅ **DONE S45** — HrmConfig Holiday composite UNIQUE (Year,Date): 7 test (`HrmConfigHolidayTests.cs`) + surfaced Mig 43 filtered-index fix
2. ✅ **DONE S45** — EmployeeSatellite FK invariant + soft-delete + cascade: 10 test (`EmployeeSatelliteTests.cs`)
3. ✅ **DONE S45** — gotcha #44 authz regression EmployeesController + HrmConfigsController: 10 test (extend `AuthorizePolicyRegressionTests.cs`)
4. Phase 10.3 Proposal ApproveV2 (S37) + Workflow Apps skeleton (S38) — test-after khi UAT confirm
5. **gotcha #57 (S51+S52 REPRODUCED):** HRM `HrmConfigFilteredUniqueTests` 2 RED (LeaveType+Shift+OtPolicy) → em main Mig 45 `.HasFilter` GREEN. **S52 EXT Master** `MasterCatalogFilteredUniqueTests` 3 RED (Department cfg:18 / Project:19 / Supplier:24 bare `.IsUnique()`) → pending em main fix migration. Vehicle+Driver (Mig 44) ĐÃ filtered. Pattern: seed `IsDeleted=true` slot + Create cùng Code → assert active==1 + `IgnoreQueryFilters` all==2.

## 📅 Recent activity (last 10 FIFO)

- **2026-06-09 (S56 GOLIVE-HARDEN TEST stage — 4 pre-golive fixes, test-after build):** +12 test → **216→228 PASS** (58 Domain + Infra 158→170, 0 fail). Build stage đã land prod fixes (CONTRACT từ build, signatures UNCHANGED). **#3 LeaveBalance lost-update fix:** handler terminal nay increment `db.LeaveBalances.Where(...).ExecuteUpdateAsync(s=>s.SetProperty(b=>b.UsedDays, b=>b.UsedDays+p.NumDays))` server-side + 1 explicit tx (READ COMMITTED, NO IsolationLevel). **⭐ GOTCHA: ExecuteUpdateAsync BYPASS change tracker** → instance bal tracked (Add STEP1 hoặc pre-seed cùng context) GIỮ UsedDays PRE-increment. **4 test cũ LeaveBalanceTests (case 1/2/3/4 line 163/201/240/269) FAIL ở baseline = stale-tracked-read, KHÔNG regression** (spec TEST GUIDANCE đã tiên đoán). Fix = `.AsNoTracking()` re-read (hoặc `ChangeTracker.Clear()`). +2 new: `TwoSeparateRequests_BothTerminal_UsedDaysAccumulates_NotOverwrites` (3+5=8 chứng minh increment accumulate KHÔNG overwrite = race-free invariant) + `Approve_AlreadyDaDuyet_ReApprove_ThrowsConflict_NoDoubleDeduct` (early guard Status!=DaGuiDuyet:296 → exactly-once, balance vẫn 3 not 6). **#4 Travel/Vehicle ApproveV2 smoke (WorkflowAppApproveV2Tests.cs +4):** mỗi module Submit→Approve→DaDuyet happy + outsider→Forbidden. ApplicableType Travel=9 prefix `DT/CT`, Vehicle=7 prefix `DX/XE`. Travel/Vehicle KHÔNG trừ balance → không seed LeaveType. Helper mới `SeedWorkflowForTypeAsync(type,code,...approverIds)`. **#5 ItTicket existence-oracle (ItTicketReassignAuthzTests.cs +2):** authz reorder (Forbidden TRƯỚC NotFound) — non-IT non-admin nhận Forbidden cho ticketId tồn tại VÀ không tồn tại (cặp 5b/5c phản hồi giống nhau = no oracle leak). Reorder KHÔNG vỡ test cũ (Case5 đã expect Forbidden; TicketNotFound dùng Admin caller pass authz hợp lệ). **#6 DocxRenderer (Forms/DocxRendererTests.cs NEW +4):** 0 test trước đó. MainDocumentPart null→`InvalidOperationException("*MainDocumentPart*")` (OpenXml 3.5.1 `WordprocessingDocument.Create(path,type)` tạo package RỖNG no main part) + placeholder replace happy + unknown-key giữ literal + null-value→empty. **⚠️ test helper ExtractBodyText: tránh `MainPart!.Document.Body!` (CS8602 warning) → dùng `?.Document?.Body` + `.Should().NotBeNull()`.** No prod bug found — tất cả fixes là build-stage, tôi WRITE test theo CONTRACT. Tag [s56, golive-harden, executeupdate-tracker-bypass, asnotracking-reread, travel-vehicle-smoke, existence-oracle, docxrenderer].
- **2026-06-08 (S54 ItTicket reassign authz — test-before-merge SECURITY) [harvested by em main — agent MEMORY write mis-landed, B2/B3]:** +13 test `tests/.../Application/ItTicketReassignAuthzTests.cs` → **203→216 PASS** (58 Domain + Infra 145→158, 0 fail). **GetAssignableItStaff (6):** Admin→CanReassign=true + 2 IT-active ordered FullName (Cao<Truong) no KT/inactive leak · IT-staff→true · non-IT non-admin (KT)→false + **empty staff (0-leak assert)** · dept-null→false+empty · inactive-IT-excluded · UserId null→Unauthorized. **AssignItTicket (7):** non-IT non-admin→**ForbiddenException** + side-effect `AssignedToUserId.Should().BeNull()` (no-mutation) · Admin+assignee∈IT→success · IT-staff+assignee∈IT→success · assignee∉IT(KT)→**ConflictException** "Người được giao phải thuộc tổ IT." · assignee inactive→NotFound · ticket not found→NotFound · null→Unauthorized. **Pattern mới: authz-capability test = seed 2-dept (IT+KT) + fake `ICurrentUser` role/dept matrix; assert canReassign flag + Forbidden/Conflict guard; empty-staff = 0-leak.** Forbidden red-able **by-contrast** (case5 non-IT vs case7 IT-staff identical-setup → chỉ khác caller-identity; rule cấm sửa prod để chứng minh RED). **No prod bug** — handler-level data-dependent authz (caller-dept vs IT-dept) = CORRECT pattern, KHÔNG phải gotcha #44 silent-403 gap (Pattern 10 reflection-regression chỉ cho static `[Authorize(Policy)]`; data-driven authz PHẢI ở handler = enforcement point, test cover tại đó). Tag [s54, it-ticket-reassign, authz-capability, forbidden-conflict-guard, test-before-merge, 0-leak].
- **2026-06-08 (S52 P11-D Master gotcha #57 EXT) [test-before · 3 RED LIVE]:** +3 test `tests/.../Application/MasterCatalogFilteredUniqueTests.cs` (run `--filter MasterCatalogFilteredUnique` → Failed 3/Passed 0). Department+Project+Supplier `.IsUnique()` BARE (Dept cfg:18 / Proj:19 / Supp:24) chưa `[IsDeleted]=0` — cùng class gotcha #57. Mirror EXACT GROUP B HrmConfigFilteredUniqueTests: seed row `IsDeleted=true` slot Code="DUP1" → `Create{Dept|Project|Supplier}CommandHandler(db)` cùng Code → assert `NotThrowAsync` + active==1 + `IgnoreQueryFilters` all==2. **3 RED** = `DbUpdateException → SQLite Error 19 UNIQUE constraint failed: {Departments|Projects|Suppliers}.Code` (app-check `AnyAsync(Code==X)` chạy QUA HasQueryFilter → loại soft-deleted → PASS → Add+SaveChanges → DB UNIQUE bare đếm cả row xoá → throw). NOT test lỗi — REPORTED em main fix migration `.HasFilter` 3 config → flip GREEN. **⚠️ all-count PHẢI `IgnoreQueryFilters()`** (khác HRM ref dùng raw `Count(Code==X)` trên DbSet đã có HasQueryFilter → trả 1 not 2 = sai; tôi sửa = active-count plain DbSet, all-count IgnoreQueryFilters). 3 handler clean `(IApplicationDbContext db)` 1-dep. KHÔNG đụng Configuration/Domain/migration. Tag [s52, p11-d, gotcha-57, master-catalog, filtered-unique, test-before, RED].
- **2026-06-08 (S52 P11-D Wave2 round-robin + SLA-due) [proxy by em main: agent killed session-limit trước MEMORY step]:** +9 test `ItTicketAssignSlaTests.cs` → **200 PASS** (Infra 133→142). **Round-robin:** seed Department Code="IT" + 2 user A/B `IsActive` trong IT + A có 1 ticket Open → Create → assign **B** (load 0<1); tie A=B → `ThenBy(Id)`; edge no-dept-IT / no-user-IT → unassigned; user ngoài IT hoặc `IsActive=false` KHÔNG assign. **SLA-due:** Priority Urgent→+4h / High→+8h / Medium→+24h / Low→+72h (assert `e.SlaDueAt==CreatedAt+SlaWindow[priority]`). **Regression P11-F:** create vẫn gen `^IT/\d{4}/\d{3}$`. `ItTicketSlaJob` BackgroundService SKIP unit-test (breach-query inline, khó test trực tiếp — REPORTED). Baseline 191→**200** (58 Domain + 142 Infra). Tag [s52, p11-d, round-robin, sla-due, regression].

- **2026-06-08 (S52 P11-E + P11-F WorkflowApps/Attendance test-after):** +5 test → **191 PASS** (Infra 128→133). 2 file `tests/.../Application/`: **ItTicketCodeGenTests** (3 — MaTicket regex `^IT/\d{4}/\d{3}$` + sequential 001→002 cùng prefix `IT/{year}` LastSeq++ + per-year-prefix 2027 reset 001) + **AttendanceReportTests** (2 — full aggregate day-type/weighted + DepartmentId filter). **⭐ Serializable-on-SQLite GOTCHA = NON-ISSUE (confirmed):** `WorkflowAppCodeGen.GenerateMaDonTuAsync` dùng `BeginTransactionAsync(IsolationLevel.Serializable)` chạy SẠCH trên SQLite — provider map isolation level gracefully (no throw), format+seq+per-year đều hold KHÔNG cần try/skip. Đã proven sẵn bởi WorkflowAppApproveV2Tests (DT/LR path). Handler `CreateItTicketHandler(db, cu, clock)` = 3 dep MediatR. **Day-type test pattern (P11-E core):** holiday check chạy TRƯỚC weekend/weekday → seed 2026-06-01 (thứ Hai) vào holidaySet → assert phân **Holiday** dù là weekday (override day-of-week). Holiday.Date=DateOnly → `BuildHoliday` dùng `DateOnly.FromDateTime`. OtWeighted = 2×1.5+3×2.0+1×3.0=12.0m. DepartmentId filter: seed 2 Department row + 2 user khác dept → query deptA chỉ trả 1 row (handler join Users `u.DepartmentId==deptId`, userMeta dùng `DefaultIfEmpty` nên dept row optional nhưng seed cho DepartmentName assert). No prod bug. **⚠️ MSBuild OOM** chạy full parallel → dùng `-maxcpucount:1 -p:BuildInParallel=false` (env resource, KHÔNG test fail). Tag [s52, p11-e, p11-f, codegen, day-type, serializable-sqlite-ok, test-after].
- **2026-06-08 (S51 P11-C HMW Wave2 filtered-unique gotcha #57):** +4 test `tests/.../Application/HrmConfigFilteredUniqueTests.cs` → **185 total = 183 PASS + 2 RED** (Infra 123→127). Mirror HolidayTests Case 7 (seed soft-deleted Code-slot → Create same Code → assert success + active==1 + all==2). **2 GREEN** Vehicle+Driver (Mig 44 config ĐÃ filtered → 2 catalog mới đúng). **2 RED INTENTIONAL = gotcha #57 REPRODUCED** (test-before): `CreateLeaveType_OnSoftDeletedCodeSlot...` → `SQLite Error 19 UNIQUE constraint failed: LeaveTypes.Code` + `CreateShift_OnSoftDeletedCodeSlot...` → `ShiftPatterns.Code` (bare `.IsUnique()` đếm cả row soft-deleted; handler app-check `!IsDeleted` PASS → Add+SaveChanges → DbUpdateException). NOT test lỗi — REPORTED em main fix Mig 45 `.HasFilter("[IsDeleted]=0")` cho 2 config → flip GREEN. **⚠️ Soft-delete trong test (giống Holiday):** AuditingInterceptor (prod soft-delete Deleted→Modified+IsDeleted=true) KHÔNG wire trong SqliteDbFixture → `Remove+SaveChanges` = HARD delete (không test được). PHẢI seed row `IsDeleted=true` thủ công để mô phỏng slot bị chiếm. Handlers chỉ cần IApplicationDbContext → `new CreateXxxHandler(db)`. Tag [s51, p11-c, gotcha-57, filtered-unique, test-before].
- **2026-05-30 (S43 P11-B Wave3 LeaveBalance):** +8 test `tests/.../Application/LeaveBalanceTests.cs` → **152 PASS** (Infra 86→94). Deduction hook (ApproveLeaveRequestHandler terminal) full: deduct single-level (create row from DaysPerYear), only-at-terminal multi-level (advance no-deduct + 1× terminal), accumulate UPSERT (5+2=7 no new row), negative allowed (Used20>Entitled12 → Remaining−8 no throw), Reject+Return no-deduct (split 5a/5b), GetMyLeaveBalances lazy synth (2 active type filter inactive), AdjustLeaveBalance upsert. **⚠️ FOUND + FIXED 2 pre-existing RED** in S42 template (`Approve_LastLevel_TransitionsToDaDuyet` + `Approve_EmptyComment_StoresPlaceholder`): Wave 1 deduction hook (uncommitted, prod) làm terminal insert LeaveBalance FK→LeaveTypes Restrict FAIL vì BuildLeave dùng `LeaveTypeId=Guid.NewGuid()`. **NOT prod bug** (prod đơn luôn pin LeaveType thật) — fix tại test: BuildLeave +optional leaveTypeId, seed LeaveType ở 2 test đó. Baseline thật trước S43 = 142-pass/2-RED (KHÔNG phải 144-green). REPORTED em main.
- **2026-06-01 (S45 HRM coverage gaps + Holiday drift) [em main proxy]:** +27 test → **181 PASS** (Infra 96→123). 3 file: HrmConfigHolidayTests (7 — composite UNIQUE Create/Update, ⭐self-update giữ key đổi Name no-false-positive, soft-delete exclusion) + EmployeeSatelliteTests (10 — 5× FK-invariant parent `AnyAsync(!IsDeleted)` guard + soft-delete + cascade-non-behavior Case5 + EF model `DeleteBehavior.Cascade` config assertion) + AuthorizePolicyRegressionTests extend (10 — HrmConfigs bare-`[Authorize]`+writes `Roles=Admin`; Employees class-`Policy=Hrm_HoSo.Read`+per-action). **FOUND drift** (test theo CODE = single source): Holiday DB UNIQUE (Year,Date) unfiltered vs handler `!IsDeleted` → recreate-on-soft-deleted-slot `DbUpdateException(500)`. REPORTED → em main fixed Mig 43 `.HasFilter("[IsDeleted]=0")` (Case 7 flipped assert SUCCESS). New pattern: EF model-metadata assertion `db.Model.FindEntityType(typeof(X)).GetForeignKeys()...DeleteBehavior` lock schema intent. ⚠️ gotcha #57 backlog: LeaveType.Code + ShiftPattern.Code vẫn unfiltered.

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## ⚠️ Anti-patterns (DO NOT)
1. ❌ Touch production code → REPORT bug · 2. ❌ Skip MEMORY · 3. ❌ Test không chạy (dotnet test must PASS) · 4. ❌ `git add -A` · 5. ❌ Push remote · 6. ❌ Assertion trivial

## 🔄 Curate trigger
Size > ~30KB → archive to L2 (tiered v1). Commit scope (em main commits): `Tests`.