основное по тестам готово

backend/tests/Tnsu.ApprovalRoute.IntegrationTests/Infrastructure/PostgresDatabaseFixture.cs

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+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using Tnsu.ApprovalRoute.Infrastructure.Persistence;
+using Xunit;
+
+namespace Tnsu.ApprovalRoute.IntegrationTests.Infrastructure;
+
+// Отдельная БД на один xUnit-collection (= один тестовый класс) в общем инстансе Postgres.
+// Тесты внутри класса делят эту БД; разные классы (разные коллекции) получают разные БД.
+public sealed class PostgresDatabaseFixture : IAsyncLifetime
+{
+    private readonly string _databaseName = $"tnsu_test_{Guid.NewGuid():N}";
+    private readonly NpgsqlConnectionStringBuilder _adminConnectionBuilder = new(TestSettings.BaseConnectionString);
+
+    public string ConnectionString { get; private set; } = string.Empty;
+
+    public async Task InitializeAsync()
+    {
+        await using (var adminConnection = new NpgsqlConnection(_adminConnectionBuilder.ConnectionString))
+        {
+            await adminConnection.OpenAsync();
+            await using var createCommand = new NpgsqlCommand($"CREATE DATABASE \"{_databaseName}\"", adminConnection);
+            await createCommand.ExecuteNonQueryAsync();
+        }
+
+        ConnectionString = new NpgsqlConnectionStringBuilder(_adminConnectionBuilder.ConnectionString)
+        {
+            Database = _databaseName
+        }.ConnectionString;
+
+        var options = new DbContextOptionsBuilder<ApprovalRouteDbContext>()
+            .UseNpgsql(ConnectionString)
+            .UseSnakeCaseNamingConvention()
+            .Options;
+
+        await using var db = new ApprovalRouteDbContext(options);
+        await db.Database.MigrateAsync();
+    }
+
+    public async Task DisposeAsync()
+    {
+        await using var adminConnection = new NpgsqlConnection(_adminConnectionBuilder.ConnectionString);
+        await adminConnection.OpenAsync();
+
+        await using (var terminateCommand = new NpgsqlCommand(
+            """
+            SELECT pg_terminate_backend(pid) FROM pg_stat_activity
+            WHERE datname = @databaseName AND pid <> pg_backend_pid();
+            """,
+            adminConnection))
+        {
+            terminateCommand.Parameters.AddWithValue("databaseName", _databaseName);
+            await terminateCommand.ExecuteNonQueryAsync();
+        }
+
+        await using var dropCommand = new NpgsqlCommand($"DROP DATABASE IF EXISTS \"{_databaseName}\"", adminConnection);
+        await dropCommand.ExecuteNonQueryAsync();
+    }
+}

backend/tests/Tnsu.ApprovalRoute.IntegrationTests/Infrastructure/TestCurrentUser.cs

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+using Tnsu.ApprovalRoute.Application.Common.Interfaces;
+
+namespace Tnsu.ApprovalRoute.IntegrationTests.Infrastructure;
+
+internal sealed class TestCurrentUser(string? email = null) : ICurrentUser
+{
+    public string? Email { get; } = email;
+}

backend/tests/Tnsu.ApprovalRoute.IntegrationTests/Infrastructure/TestServiceProviderFactory.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Tnsu.ApprovalRoute.Application;
+using Tnsu.ApprovalRoute.Application.Common.Interfaces;
+using Tnsu.ApprovalRoute.Infrastructure;
+
+namespace Tnsu.ApprovalRoute.IntegrationTests.Infrastructure;
+
+// Собирает такой же DI-контейнер, как реальное приложение (те же extension-методы, что в Program.cs),
+// но с тестовой БД и тестовым ICurrentUser вместо HttpContext-based реализации.
+internal static class TestServiceProviderFactory
+{
+    public static ServiceProvider Build(string connectionString, string? currentUserEmail = "initiator@tnsu.kz")
+    {
+        var configuration = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["ConnectionStrings:Postgres"] = connectionString
+            })
+            .Build();
+
+        var services = new ServiceCollection();
+        services.AddApprovalRouteInfrastructure(configuration);
+        services.AddApprovalRouteApplication();
+        services.AddSingleton<ICurrentUser>(new TestCurrentUser(currentUserEmail));
+
+        return services.BuildServiceProvider();
+    }
+}

backend/tests/Tnsu.ApprovalRoute.IntegrationTests/Infrastructure/TestSettings.cs

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+namespace Tnsu.ApprovalRoute.IntegrationTests.Infrastructure;
+
+internal static class TestSettings
+{
+    public static string BaseConnectionString =>
+        Environment.GetEnvironmentVariable("TEST_POSTGRES_CONNECTION")
+        ?? "Host=localhost;Port=5435;Database=tnsu_approval_route;Username=tnsu_approval_route;Password=tnsu_approval_route";
+}