[CLAUDE] Tests Phase 2: Code generator format + sequence tests (SQLite in-memory)

Phase 2 — chống regression code generator. 17 test mới integration với
DB thật (SQLite in-memory) tổng cộng 71 test pass < 3 giây.

Test project:
- tests/SolutionErp.Infrastructure.Tests/ (xUnit + FluentAssertions + EF SQLite 10)
- ProjectReference SolutionErp.Infrastructure (transitively get Application + Domain)
- Added vào SolutionErp.slnx

Test fixtures:
- Common/SqliteDbFixture.cs:
  - SQLite ":memory:" + shared connection + EnsureCreated() từ DbContext model
  - TestApplicationDbContext subclass — override OnModelCreating replace
    'nvarchar(max)' → 'TEXT' (SQLite không support max keyword)
  - FixedDateTime stub IDateTime cho deterministic year boundary test

Test files:
- Services/ContractCodeGeneratorTests.cs (10 test):
  - Format per ContractType (5 type × Project scope) — RG-001 spec
  - Framework HĐ (NguyenTacNCC + NguyenTacDV) → year scope thay vì project
  - Sequence increment per prefix (3 calls → /01, /02, /03)
  - Different prefixes (project / supplier) → independent sequences
  - Year change (2026 → 2027) → reset sequence vì prefix khác
  - PersistsSequenceRow LastSeq verification
- Services/PurchaseEvaluationCodeGeneratorTests.cs (7 test):
  - Format A/B (DuyetNcc → 'A', DuyetNccPhuongAn → 'B')
  - Seq là 3-digit padded (001..012)
  - Type A và B sequence độc lập trong cùng năm
  - Year boundary reset cả A và B

CI gate update (.gitea/workflows/deploy.yml):
- Step "Run integration tests (Infrastructure)" thêm sau Domain tests
- TRX log saved riêng (infra-tests.trx)
- Cả 2 step đều exit non-zero → no deploy

Verify local:
- dotnet test SolutionErp.slnx → Total tests: 71 (54 Domain + 17 Infra) / Passed: 71 / 2.1s
- dotnet build SolutionErp.slnx → 0 error

Phase 3+ pending:
- Application handler tests (CQRS) với EF InMemory hoặc SQLite (~1 ngày)
- API smoke tests qua WebApplicationFactory (~0.5 ngày)
- FE Vitest cho lib utility (~0.5 ngày)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/SolutionErp.Infrastructure.Tests/Common/SqliteDbFixture.cs

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+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SolutionErp.Application.Common.Interfaces;
+using SolutionErp.Infrastructure.Persistence;
+
+namespace SolutionErp.Infrastructure.Tests.Common;
+
+// Subclass cho test — override column types SQL Server-specific (`nvarchar(max)`)
+// về TEXT vì SQLite không hỗ trợ. Identity table inherit từ IdentityDbContext
+// dùng kiểu chuẩn nên không cần fix thêm.
+public class TestApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
+    : ApplicationDbContext(options)
+{
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        // Replace `nvarchar(max)` / `varchar(max)` → `TEXT` cho SQLite compat.
+        foreach (var entity in modelBuilder.Model.GetEntityTypes())
+        {
+            foreach (var prop in entity.GetProperties())
+            {
+                var colType = prop.GetColumnType();
+                if (colType is not null && colType.Contains("max", StringComparison.OrdinalIgnoreCase))
+                {
+                    prop.SetColumnType("TEXT");
+                }
+            }
+        }
+    }
+}
+
+// Fixture build SQLite in-memory ApplicationDbContext mỗi test isolated.
+// Pattern: shared connection (open in fixture) + EnsureCreated() từ model.
+//
+// Tại sao SQLite chứ không InMemory provider?
+//   - InMemory không hỗ trợ transactions — code generator dùng IsolationLevel.Serializable
+//   - SQLite hỗ trợ transactions thật (BEGIN/COMMIT/ROLLBACK), tuy nhiên IsolationLevel
+//     enum value bị provider mapping gracefully (no exception, just default behavior)
+//   - Đủ để test format + sequential increment + scope reset, KHÔNG đủ cho test
+//     race condition thực (cần SQL Server thật)
+public sealed class SqliteDbFixture : IDisposable
+{
+    private readonly SqliteConnection _connection;
+    public TestApplicationDbContext Db { get; }
+
+    public SqliteDbFixture()
+    {
+        // ":memory:" + shared connection — DB tồn tại đến khi connection close.
+        _connection = new SqliteConnection("DataSource=:memory:");
+        _connection.Open();
+
+        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
+            .UseSqlite(_connection)
+            .EnableSensitiveDataLogging()
+            .Options;
+
+        Db = new TestApplicationDbContext(options);
+        Db.Database.EnsureCreated();
+    }
+
+    public void Dispose()
+    {
+        Db.Dispose();
+        _connection.Dispose();
+    }
+}
+
+// Stub IDateTime cho tests deterministic — control thời điểm Year boundary.
+public sealed class FixedDateTime(DateTime utcNow) : IDateTime
+{
+    public DateTime UtcNow { get; set; } = utcNow;
+    public DateTime Now => UtcNow;   // simplification — VPS chạy UTC, không bao giờ dùng local time trong tests
+}

tests/SolutionErp.Infrastructure.Tests/Services/ContractCodeGeneratorTests.cs

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+using SolutionErp.Domain.Contracts;
+using SolutionErp.Infrastructure.Services;
+using SolutionErp.Infrastructure.Tests.Common;
+
+namespace SolutionErp.Infrastructure.Tests.Services;
+
+// Tests cho ContractCodeGenerator — format mã RG-001 + atomic sequence increment.
+// Dùng SQLite in-memory cho transactions thật, KHÔNG test race condition
+// (cần SQL Server thật cho SERIALIZABLE strict — đó là integration test riêng).
+
+public class ContractCodeGeneratorTests
+{
+    private static (ContractCodeGenerator gen, SqliteDbFixture fix, FixedDateTime dt) CreateGenerator(int year = 2026)
+    {
+        var fix = new SqliteDbFixture();
+        var dt = new FixedDateTime(new DateTime(year, 6, 15, 0, 0, 0, DateTimeKind.Utc));
+        var gen = new ContractCodeGenerator(fix.Db, dt);
+        return (gen, fix, dt);
+    }
+
+    // ===== Format per ContractType (RG-001) =====
+
+    [Theory]
+    [InlineData(ContractType.HopDongThauPhu, "HĐTP")]
+    [InlineData(ContractType.HopDongGiaoKhoan, "HĐGK")]
+    [InlineData(ContractType.HopDongNhaCungCap, "NCC")]
+    [InlineData(ContractType.HopDongDichVu, "HĐDV")]
+    [InlineData(ContractType.HopDongMuaBan, "MB")]
+    public async Task Generate_ProjectScoped_FormatMatches_RG001(ContractType type, string expectedTypeCode)
+    {
+        var (gen, fix, _) = CreateGenerator();
+        using (fix)
+        {
+            var contract = new Contract { Type = type };
+            var code = await gen.GenerateAsync(contract, projectCode: "FLOCK01", supplierCode: "BTBM");
+            // Expected format: {Project}/{TypeCode}/SOL&{Supplier}/{Seq}
+            code.Should().Be($"FLOCK01/{expectedTypeCode}/SOL&BTBM/01");
+        }
+    }
+
+    [Fact]
+    public async Task Generate_FrameworkContract_NCC_UsesYearScope_NotProjectCode()
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var contract = new Contract { Type = ContractType.HopDongNguyenTacNCC };
+            var code = await gen.GenerateAsync(contract, projectCode: "FLOCK01", supplierCode: "BTBM");
+            // Framework HĐ → scope = year (không phải project)
+            code.Should().Be("2026/NCC/SOL&BTBM/01");
+        }
+    }
+
+    [Fact]
+    public async Task Generate_FrameworkContract_DichVu_UsesYearScope()
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var contract = new Contract { Type = ContractType.HopDongNguyenTacDichVu };
+            var code = await gen.GenerateAsync(contract, projectCode: "FLOCK01", supplierCode: "ABC");
+            code.Should().Be("2026/HĐDV/SOL&ABC/01");
+        }
+    }
+
+    // ===== Sequence increment per prefix =====
+
+    [Fact]
+    public async Task Generate_SamePrefix_SequenceIncrements()
+    {
+        var (gen, fix, _) = CreateGenerator();
+        using (fix)
+        {
+            var c = new Contract { Type = ContractType.HopDongThauPhu };
+            var code1 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            var code2 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            var code3 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+
+            code1.Should().EndWith("/01");
+            code2.Should().EndWith("/02");
+            code3.Should().EndWith("/03");
+        }
+    }
+
+    [Fact]
+    public async Task Generate_DifferentPrefixes_IndependentSequences()
+    {
+        var (gen, fix, _) = CreateGenerator();
+        using (fix)
+        {
+            var c = new Contract { Type = ContractType.HopDongThauPhu };
+            var codeA = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            var codeB = await gen.GenerateAsync(c, "FLOCK02", "BTBM");
+            var codeC = await gen.GenerateAsync(c, "FLOCK01", "OTHER");
+
+            // Mỗi prefix có sequence riêng, đều bắt đầu /01
+            codeA.Should().Be("FLOCK01/HĐTP/SOL&BTBM/01");
+            codeB.Should().Be("FLOCK02/HĐTP/SOL&BTBM/01");
+            codeC.Should().Be("FLOCK01/HĐTP/SOL&OTHER/01");
+        }
+    }
+
+    // ===== Year boundary cho framework HĐ =====
+
+    [Fact]
+    public async Task Generate_Framework_YearChange_ResetsSequence()
+    {
+        var (gen, fix, dt) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var c = new Contract { Type = ContractType.HopDongNguyenTacNCC };
+
+            // 2026: 2 phiếu
+            var code2026_1 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            var code2026_2 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            code2026_1.Should().Be("2026/NCC/SOL&BTBM/01");
+            code2026_2.Should().Be("2026/NCC/SOL&BTBM/02");
+
+            // Sang 2027 → prefix mới (year đổi) → bắt đầu lại /01
+            dt.UtcNow = new DateTime(2027, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            var code2027 = await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            code2027.Should().Be("2027/NCC/SOL&BTBM/01");
+        }
+    }
+
+    // ===== Persistence sequence row =====
+
+    [Fact]
+    public async Task Generate_PersistsSequenceRow_WithCorrectLastSeq()
+    {
+        var (gen, fix, _) = CreateGenerator();
+        using (fix)
+        {
+            var c = new Contract { Type = ContractType.HopDongThauPhu };
+            await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+            await gen.GenerateAsync(c, "FLOCK01", "BTBM");
+
+            var seq = fix.Db.ContractCodeSequences.Single(s => s.Prefix == "FLOCK01/HĐTP/SOL&BTBM");
+            seq.LastSeq.Should().Be(3);
+            seq.UpdatedAt.Should().NotBe(default);
+        }
+    }
+}

tests/SolutionErp.Infrastructure.Tests/Services/PurchaseEvaluationCodeGeneratorTests.cs

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+using SolutionErp.Domain.PurchaseEvaluations;
+using SolutionErp.Infrastructure.Services;
+using SolutionErp.Infrastructure.Tests.Common;
+
+namespace SolutionErp.Infrastructure.Tests.Services;
+
+// Tests cho PurchaseEvaluationCodeGenerator — format `PE/{YYYY}/{TypeLetter}/{Seq:D3}`.
+// Sequence per year × type: A và B độc lập, sang năm reset cả 2.
+
+public class PurchaseEvaluationCodeGeneratorTests
+{
+    private static (PurchaseEvaluationCodeGenerator gen, SqliteDbFixture fix, FixedDateTime dt)
+        CreateGenerator(int year = 2026)
+    {
+        var fix = new SqliteDbFixture();
+        var dt = new FixedDateTime(new DateTime(year, 6, 15, 0, 0, 0, DateTimeKind.Utc));
+        var gen = new PurchaseEvaluationCodeGenerator(fix.Db, dt);
+        return (gen, fix, dt);
+    }
+
+    // ===== Format =====
+
+    [Theory]
+    [InlineData(PurchaseEvaluationType.DuyetNcc, "A")]
+    [InlineData(PurchaseEvaluationType.DuyetNccPhuongAn, "B")]
+    public async Task Generate_FirstPhieu_FormatMatches(PurchaseEvaluationType type, string expectedLetter)
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var pe = new PurchaseEvaluation { Type = type };
+            var code = await gen.GenerateAsync(pe);
+            // Expected: PE/2026/A/001 hoặc PE/2026/B/001
+            code.Should().Be($"PE/2026/{expectedLetter}/001");
+        }
+    }
+
+    [Fact]
+    public async Task Generate_SeqIs3DigitPadded()
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var pe = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNcc };
+            // Generate 12 phiếu — kiểm tra padding D3
+            string? lastCode = null;
+            for (int i = 0; i < 12; i++)
+                lastCode = await gen.GenerateAsync(pe);
+
+            lastCode.Should().Be("PE/2026/A/012");
+        }
+    }
+
+    // ===== A vs B independent sequences =====
+
+    [Fact]
+    public async Task Generate_TypeA_And_TypeB_HaveIndependentSequences()
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var peA = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNcc };
+            var peB = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNccPhuongAn };
+
+            var a1 = await gen.GenerateAsync(peA);
+            var b1 = await gen.GenerateAsync(peB);
+            var a2 = await gen.GenerateAsync(peA);
+            var b2 = await gen.GenerateAsync(peB);
+
+            a1.Should().Be("PE/2026/A/001");
+            a2.Should().Be("PE/2026/A/002");
+            b1.Should().Be("PE/2026/B/001");
+            b2.Should().Be("PE/2026/B/002");
+        }
+    }
+
+    // ===== Year boundary =====
+
+    [Fact]
+    public async Task Generate_YearChange_ResetsBothA_And_B_Sequences()
+    {
+        var (gen, fix, dt) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var peA = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNcc };
+            var peB = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNccPhuongAn };
+
+            await gen.GenerateAsync(peA);   // PE/2026/A/001
+            await gen.GenerateAsync(peA);   // PE/2026/A/002
+            await gen.GenerateAsync(peB);   // PE/2026/B/001
+
+            dt.UtcNow = new DateTime(2027, 1, 5, 0, 0, 0, DateTimeKind.Utc);
+
+            var a2027 = await gen.GenerateAsync(peA);
+            var b2027 = await gen.GenerateAsync(peB);
+            a2027.Should().Be("PE/2027/A/001");
+            b2027.Should().Be("PE/2027/B/001");
+        }
+    }
+
+    // ===== Persistence row =====
+
+    [Fact]
+    public async Task Generate_PersistsSequenceRow_PrefixIsKey()
+    {
+        var (gen, fix, _) = CreateGenerator(year: 2026);
+        using (fix)
+        {
+            var peA = new PurchaseEvaluation { Type = PurchaseEvaluationType.DuyetNcc };
+            await gen.GenerateAsync(peA);
+            await gen.GenerateAsync(peA);
+            await gen.GenerateAsync(peA);
+
+            var seq = fix.Db.PurchaseEvaluationCodeSequences.Single(s => s.Prefix == "PE/2026/A");
+            seq.LastSeq.Should().Be(3);
+        }
+    }
+}

tests/SolutionErp.Infrastructure.Tests/SolutionErp.Infrastructure.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+    <PackageReference Include="FluentAssertions" Version="7.2.0" />
+
+    <!-- SQLite in-memory cho integration test code generators (real DB transactions). -->
+    <!-- EnsureCreated() build schema từ DbContext model — không cần migration. -->
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Backend\SolutionErp.Infrastructure\SolutionErp.Infrastructure.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+    <Using Include="FluentAssertions" />
+  </ItemGroup>
+
+</Project>