Enable use of Testcontainers

Author: gliljas

src/NHibernate.Test/NHibernate.Test.csproj

@@ -69,6 +69,13 @@
     <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="9.1.1" />
     <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="MySql.Data" Version="8.0.30" />
+    <PackageReference Include="Testcontainers.Db2" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.FirebirdSql" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.MariaDb" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.MsSql" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.MySql" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.Oracle" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.PostgreSql" Version="4.8.1" />
   </ItemGroup>
   <ItemGroup Condition="$(NhNetFx)">
     <Reference Include="System.Configuration" />

src/NHibernate.Test/TestConfigurationHelper.cs

@@ -47,6 +47,12 @@ public static Configuration GetDefaultConfiguration()
 			Configuration result = new Configuration();
 			if (hibernateConfigFile != null)
 				result.Configure(hibernateConfigFile);
+
+			var connectionString = result.GetProperty(Cfg.Environment.ConnectionString);
+			if (connectionString?.StartsWith("testcontainers=") == true)
+			{
+				result.SetProperty(Cfg.Environment.ConnectionString, TestContainerSetup.GetConnectionString(connectionString));
+			}
 			return result;
 		}
 
@@ -71,4 +77,4 @@ private static string FindCurrentTestConfigurationFile(string filename)
             return null;
         }
 	}
-}
+}

src/NHibernate.Test/TestContainerSetup.cs

@@ -0,0 +1,76 @@
+namespace NHibernate.Test
+{
+	using System;
+	using System.Threading.Tasks;
+	using DotNet.Testcontainers.Containers;
+	using NUnit.Framework;
+	using Testcontainers.Db2;
+	using Testcontainers.FirebirdSql;
+	using Testcontainers.MariaDb;
+	using Testcontainers.MsSql;
+	using Testcontainers.MySql;
+	using Testcontainers.Oracle;
+	using Testcontainers.PostgreSql;
+
+	[SetUpFixture]
+	public class TestContainerSetup
+	{
+		private static IDatabaseContainer _container;
+		private static readonly object _lock = new object();
+
+		internal static string GetConnectionString(string connectionString)
+		{
+			var parts = connectionString.Split('=');
+			if (parts.Length != 2 || parts[0] != "testcontainers")
+			{
+				throw new System.ArgumentException("Invalid testcontainers connection string format. Expected format: testcontainers=DbType");
+			}
+			// For now, only one container is supported. In the future, we can extend this to support multiple containers.
+			if (_container == null)
+			{
+				lock (_lock)
+				{
+					if (_container == null)
+					{
+						var container = GetContainer(parts[1]);
+						Task.Run(() => container.StartAsync()).GetAwaiter().GetResult();
+						_container = container;
+					}
+				}
+			}
+			return _container.GetConnectionString();
+		}
+
+		private static IDatabaseContainer GetContainer(string dbType)
+		{
+			switch (dbType.ToLower())
+			{
+				case "db2":
+					return new Db2Builder().Build();
+				case "firebirdsql":
+					return new FirebirdSqlBuilder().Build();
+				case "mariadb":
+					return new MariaDbBuilder().Build();
+				case "mssql":
+					return new MsSqlBuilder().Build();
+				case "mysql":
+					return new MySqlBuilder().Build();
+				case "oracle":
+					return new OracleBuilder().Build();
+				case "postgresql":
+					return new PostgreSqlBuilder().Build();
+				default:
+					throw new NotSupportedException("Database type not supported: " + dbType);
+			}
+		}
+
+		[OneTimeTearDown]
+		public async Task TearDown()
+		{
+			if (_container != null)
+			{
+				await _container.DisposeAsync();
+			}
+		}
+	}
+}