generate stable database names and reuse container instance

TestExamplesDotnet.EntityFrameworkCore/DataBaseNameGenerator.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace TestExamplesDotnet;
+
+public sealed class DataBaseNameGenerator<TDbContext> : IDataBaseNameGenerator
+    where TDbContext : DbContext
+{
+    private int _counter;
+
+    public string GetDataBaseName()
+    {
+        var migrationId = typeof(TDbContext).Assembly.ManifestModule.ModuleVersionId.ToString("N");;
+
+        var counter = Interlocked.Increment(ref _counter);
+        return $"{migrationId}_{counter}";
+    }
+}

TestExamplesDotnet.EntityFrameworkCore/ServiceCollectionExtensions.cs

@@ -9,5 +9,6 @@ public static void RegisterMigrationInitializer<TContext>(this IServiceCollectio
         where TContext : DbContext
     {
         services.AddTransient<IDatabaseInitializer, DbContextMigrationInitializer<TContext>>();
+        services.AddSingleton<IDataBaseNameGenerator, DataBaseNameGenerator<TContext>>();
     }
 }

TestExamplesDotnet.Mssql/ServiceCollectionExtensions.cs

@@ -16,7 +16,9 @@ public static void RegisterMssqlContainer(this IServiceCollection services)
         });
         services.AddTransient<IPooledObjectPolicy<IDatabase>, MsSqlDatabasePoolPolicy>();
 
-        var container = new MsSqlBuilder().Build();
+        var container = new MsSqlBuilder()
+            .WithReuse(true)
+            .Build();
         Utils.RunWithoutSynchronizationContext(() => container.StartAsync().Wait());
         services.AddSingleton(container);
     }

TestExamplesDotnet.PostgreSql/PostgreSqlDatabase.cs

@@ -13,11 +13,11 @@ public sealed class PostgreSqlDatabase : IDatabase
     private bool _initialized;
     public string ConnectionString { get; }
 
-    public PostgreSqlDatabase(PostgreSqlContainer container, IDatabaseInitializer databaseInitializer, RespawnerOptions respawnerOptions)
+    public PostgreSqlDatabase(PostgreSqlContainer container, IDatabaseInitializer databaseInitializer, RespawnerOptions respawnerOptions, IDataBaseNameGenerator dataBaseNameGenerator)
     {
         _databaseInitializer = databaseInitializer;
         _respawnerOptions = respawnerOptions;
-        ConnectionString = $"Host=127.0.0.1;Port={container.GetMappedPublicPort(5432)};Database={Guid.NewGuid()};Username=postgres;Password=postgres;Include Error Detail=true";
+        ConnectionString = $"Host=127.0.0.1;Port={container.GetMappedPublicPort(5432)};Database={dataBaseNameGenerator.GetDataBaseName()};Username=postgres;Password=postgres;Include Error Detail=true";
     }
 
     public void Initialize(IHost host)

TestExamplesDotnet.PostgreSql/PostgreSqlDatabasePoolPolicy.cs

@@ -9,16 +9,18 @@ public sealed class PostgreSqlDatabasePoolPolicy : IPooledObjectPolicy<IDatabase
     private readonly PostgreSqlContainer _container;
     private readonly IDatabaseInitializer _databaseInitializer;
     private readonly RespawnerOptions _respawnerOptions;
+    private readonly IDataBaseNameGenerator _dataBaseNameGenerator;
 
 
-    public PostgreSqlDatabasePoolPolicy(PostgreSqlContainer container, IDatabaseInitializer databaseInitializer, RespawnerOptions respawnerOptions)
+    public PostgreSqlDatabasePoolPolicy(PostgreSqlContainer container, IDatabaseInitializer databaseInitializer, RespawnerOptions respawnerOptions, IDataBaseNameGenerator dataBaseNameGenerator)
     {
         _container = container;
         _databaseInitializer = databaseInitializer;
         _respawnerOptions = respawnerOptions;
+        _dataBaseNameGenerator = dataBaseNameGenerator;
     }
 
-    public IDatabase Create() => new PostgreSqlDatabase(_container, _databaseInitializer, _respawnerOptions);
+    public IDatabase Create() => new PostgreSqlDatabase(_container, _databaseInitializer, _respawnerOptions, _dataBaseNameGenerator);
 
     public bool Return(IDatabase obj) => true;
 }

TestExamplesDotnet.PostgreSql/ServiceCollectionExtensions.cs

@@ -16,8 +16,11 @@ public static void RegisterPostgreSqlContainer(this IServiceCollection services)
         });
         services.AddTransient<IPooledObjectPolicy<IDatabase>, PostgreSqlDatabasePoolPolicy>();
 
-        var container = new PostgreSqlBuilder().Build();
+        var container = new PostgreSqlBuilder()
+            .WithReuse(true)
+            .Build();
         Utils.RunWithoutSynchronizationContext(() => container.StartAsync().Wait());
+
         services.AddSingleton(container);
     }
 }

TestExamplesDotnet/IDataBaseNameGenerator.cs

@@ -0,0 +1,6 @@
+namespace TestExamplesDotnet;
+
+public interface IDataBaseNameGenerator
+{
+    string GetDataBaseName();
+}