Add `AbpUnitTestSqliteConnection` for unit test.

Resolve #19065

framework/src/Volo.Abp.EntityFrameworkCore.Sqlite/Volo/Abp/EntityFrameworkCore/Sqlite/AbpUnitTestSqliteConnection.cs

@@ -0,0 +1,52 @@
+using System.Threading;
+using Microsoft.Data.Sqlite;
+using Volo.Abp.Threading;
+
+namespace Volo.Abp.EntityFrameworkCore.Sqlite;
+
+/// <summary>
+/// This class is for unit testing purposes.
+/// It prevents exceptions in concurrent testing because Sqlite is not thread-safe.
+/// </summary>
+public class AbpUnitTestSqliteConnection : SqliteConnection
+{
+    public AbpUnitTestSqliteConnection(string connectionString)
+        : base(connectionString)
+    {
+    }
+
+    public override SqliteCommand CreateCommand()
+    {
+        return new AbpSqliteCommand
+        {
+            Connection = this,
+            CommandTimeout = DefaultTimeout,
+            Transaction = Transaction
+        };
+    }
+}
+
+internal class AbpSqliteCommand : SqliteCommand
+{
+    private readonly static SemaphoreSlim SyncSemaphore = new SemaphoreSlim(1, 1);
+
+    public override SqliteConnection? Connection
+    {
+        get => base.Connection;
+        set
+        {
+            using (SyncSemaphore.Lock())
+            {
+                base.Connection = value;
+            }
+        }
+    }
+
+    protected override void Dispose(bool disposing)
+    {
+        using (SyncSemaphore.Lock())
+        {
+            base.Dispose(disposing);
+        }
+    }
+}