duplicati/Duplicati/UnitTest/SQLiteTests.cs

// Copyright (C) 2025, The Duplicati Team
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using System.Collections.Generic;
using System.Data;
using Duplicati.Library.Main.Database;
using Duplicati.Library.SQLiteHelper;
using Duplicati.Library.Utility;
using NUnit.Framework;
using Assert = NUnit.Framework.Legacy.ClassicAssert;

namespace Duplicati.UnitTest
{
    [TestFixture]
    public class SQLiteTests : BasicSetupHelper
    {
        private static IDbConnection CreateDummyDatabase(string path)
        {
            var connection = SQLiteLoader.LoadConnection(path, 0);

            using (var command = connection.CreateCommand())
            {
                command.CommandText = "CREATE TABLE TestTable (ID INTEGER PRIMARY KEY, Name TEXT)";
                command.ExecuteNonQuery();

                command.CommandText = "INSERT INTO TestTable (ID, Name) VALUES (1, 'Test1'), (2, 'Test2'), (3, 'Test3')";
                command.ExecuteNonQuery();
            }

            return connection;

        }

        [Test]
        [Category("SQLite")]
        public void TestEmptyTransaction()
        {
            using var tf = new TempFile();
            using var connection = CreateDummyDatabase(tf);

            using var t1 = connection.BeginTransaction();
            t1.Commit(); // No exception should be thrown

            using var t2 = connection.BeginTransaction();
            t2.Rollback(); // No exception should be thrown        
        }

        [Test]
        [Category("SQLite")]
        public void TestListExpansion()
        {
            using var tf = new TempFile();
            using var connection = CreateDummyDatabase(tf);

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                command.ExpandInClauseParameter("@List", new long[] { 1, 2, 3 });
                Assert.AreEqual(3, command.ExecuteScalarInt64());
            }

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                command.ExpandInClauseParameter("@List", new long[] { 1, 2 });
                Assert.AreEqual(2, command.ExecuteScalarInt64());
            }

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                command.ExpandInClauseParameter("@List", new long[] { 1 });
                Assert.AreEqual(1, command.ExecuteScalarInt64());
            }

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                command.ExpandInClauseParameter("@List", new long[0]);
                Assert.AreEqual(0, command.ExecuteScalarInt64());
            }

            var list = new List<long>();
            for (var i = 0; i < 1000; i++)
                list.Add(i);

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                using var tmplist = new TemporaryDbValueList(connection, null, list);
                command.ExpandInClauseParameter("@List", list);
                Assert.AreEqual(3, command.ExecuteScalarInt64());
            }

            using (var command = connection.CreateCommand("SELECT COUNT(*) FROM TestTable WHERE ID IN (@List)"))
            {
                list.Remove(1);
                list.Remove(2);

                using var tmplist = new TemporaryDbValueList(connection, null, list);
                command.ExpandInClauseParameter("@List", list);
                Assert.AreEqual(1, command.ExecuteScalarInt64());
            }
        }
    }
}