TagTest : Separate session per test

this prevents some errors

Additonal change is CreateSessionAndTransaction returns session and scope
of transaction, it is useful for opening global session and transaction
as well as for opening session and transaction per test.

Author: alex-kulakov

Orm/Xtensive.Orm.Tests.Framework/AutoBuildTest.cs

@@ -1,6 +1,6 @@
-// Copyright (C) 2003-2010 Xtensive LLC.
-// All rights reserved.
-// For conditions of distribution and use, see license.
+// Copyright (C) 2008-2023 Xtensive LLC.
+// This code is distributed under MIT license terms.
+// See the License.txt file in the project root for more information.
 // Created by: Dmitri Maximov
 // Created:    2008.07.31
 
@@ -72,14 +72,15 @@ protected virtual void CheckRequirements()
     {
     }
 
-    protected void CreateSessionAndTransaction()
+    protected (Session, TransactionScope) CreateSessionAndTransaction()
     {
       try {
         disposables = new DisposableSet();
         var session = Domain.OpenSession();
-        disposables.Add(session);
         var transaction = session.OpenTransaction();
-        disposables.Add(transaction);
+        _ = disposables.Add(session);
+        _ = disposables.Add(transaction);
+        return (session, transaction);
       }
       catch {
         disposables.DisposeSafely();

Orm/Xtensive.Orm.Tests/Issues/Issue0435_BatchingFail.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2009-2020 Xtensive LLC.
+// Copyright (C) 2009-20223 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
@@ -38,7 +38,7 @@ protected override DomainConfiguration BuildConfiguration()
     public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
     }
 
     [Test]

Orm/Xtensive.Orm.Tests/Issues/IssueJira0187_TypeCastInContain.cs

@@ -1,6 +1,6 @@
-// Copyright (C) 2011 Xtensive LLC.
-// All rights reserved.
-// For conditions of distribution and use, see license.
+// Copyright (C) 2011-2023 Xtensive LLC.
+// This code is distributed under MIT license terms.
+// See the License.txt file in the project root for more information.
 // Created by: Dmitri Maximov
 // Created:    2011.09.06
 
@@ -53,7 +53,7 @@ protected override DomainConfiguration BuildConfiguration()
     public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
     }
 
     [Test]

Orm/Xtensive.Orm.Tests/Issues/IssueJira0221_UnableToTranslateAggregate.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2011-2021 Xtensive LLC.
+// Copyright (C) 2011-2023 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
@@ -54,7 +54,7 @@ public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
 
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
 
       _ = new ZamesInfo {Owner = new Zames(), Rank = 1};
       _ = new ZamesInfo {Owner = new Zames(), Rank = 3};

Orm/Xtensive.Orm.Tests/Issues/IssueJira0242_LegacyExecuteMethodsDoNotWork.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2012-2020 Xtensive LLC.
+// Copyright (C) 2012-2023 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
@@ -16,7 +16,7 @@ public class IssueJira0242_LegacyExecuteMethodsDoNotWork : AutoBuildTest
     public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
     }
 
     #region Compiled queries

Orm/Xtensive.Orm.Tests/Issues/IssueJira0746_LikeBehaviorDifferentOnClientSide.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2018-2020 Xtensive LLC.
+// Copyright (C) 2018-2023 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Kudelin
@@ -87,7 +87,7 @@ public class IssueJira0746_LikeBehaviorDifferentOnClientSide : AutoBuildTest
     public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
     }
 
     protected override DomainConfiguration BuildConfiguration()

Orm/Xtensive.Orm.Tests/Linq/ConvariantQueriesTest.cs

@@ -1,6 +1,6 @@
-// Copyright (C) 2011 Xtensive LLC.
-// All rights reserved.
-// For conditions of distribution and use, see license.
+// Copyright (C) 2011-2023 Xtensive LLC.
+// This code is distributed under MIT license terms.
+// See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
 // Created:    2011.11.02
 
@@ -42,7 +42,7 @@ protected override DomainConfiguration BuildConfiguration()
     public override void TestFixtureSetUp()
     {
       base.TestFixtureSetUp();
-      CreateSessionAndTransaction();
+      _ = CreateSessionAndTransaction();
     }
 
     [Test]