Index: Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/test-data/AssessmentSectionProvider/project.risk
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diff -u -rd7250e6a0949ba63de3e9c107fa3916a1835a388 -r8a393aff75ea9968eb993b07f2cffb4e8da289c2
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Index: Riskeer/Migration/test/Riskeer.Migration.Core.Test/test-data/MigrationTestProject251NoOutput.risk
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diff -u
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Index: Riskeer/Migration/test/Riskeer.Migration.Integration.Test/MigrationTo261IntegrationTest.cs
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diff -u
--- Riskeer/Migration/test/Riskeer.Migration.Integration.Test/MigrationTo261IntegrationTest.cs	(revision 0)
+++ Riskeer/Migration/test/Riskeer.Migration.Integration.Test/MigrationTo261IntegrationTest.cs	(revision 8a393aff75ea9968eb993b07f2cffb4e8da289c2)
@@ -0,0 +1,199 @@
+// Copyright (C) Stichting Deltares and State of the Netherlands 2026. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using Core.Common.TestUtil;
+using NUnit.Framework;
+using Riskeer.Migration.Core;
+using Riskeer.Migration.Core.TestUtil;
+
+namespace Riskeer.Migration.Integration.Test
+{
+    public class MigrationTo261IntegrationTest
+    {
+        private const string newVersion = "26.1";
+
+        [Test]
+        [TestCaseSource(nameof(GetMigrationProjectsWithMessages))]
+        public void Given251Project_WhenUpgradedTo261_ThenProjectAsExpected(string fileName, IEnumerable<string> expectedMessages)
+        {
+            // Given
+            string sourceFilePath = TestHelper.GetTestDataPath(TestDataPath.Riskeer.Migration.Core, fileName);
+            var fromVersionedFile = new ProjectVersionedFile(sourceFilePath);
+
+            string targetFilePath = TestHelper.GetScratchPadPath(nameof(Given251Project_WhenUpgradedTo261_ThenProjectAsExpected));
+            string logFilePath = TestHelper.GetScratchPadPath(string.Concat(nameof(Given251Project_WhenUpgradedTo261_ThenProjectAsExpected), ".log"));
+
+            var migrator = new ProjectFileMigrator
+            {
+                LogPath = logFilePath
+            };
+
+            using (new FileDisposeHelper(logFilePath))
+            using (new FileDisposeHelper(targetFilePath))
+            {
+                // When
+                migrator.Migrate(fromVersionedFile, newVersion, targetFilePath);
+
+                // Then
+                using (var reader = new MigratedDatabaseReader(targetFilePath))
+                {
+                    AssertTablesContentMigrated(reader, sourceFilePath);
+
+                    AssertVersions(reader);
+                    AssertDatabase(reader);
+                }
+
+                AssertLogDatabase(logFilePath, expectedMessages);
+            }
+        }
+
+        private static IEnumerable<TestCaseData> GetMigrationProjectsWithMessages()
+        {
+            yield return new TestCaseData("MigrationTestProject251NoOutput.risk", new[]
+            {
+                "* Geen aanpassingen."
+            });
+        }
+
+        private static void AssertTablesContentMigrated(MigratedDatabaseReader reader, string sourceFilePath)
+        {
+            string[] tables =
+            {
+                "AdoptableFailureMechanismSectionResultEntity",
+                "AssessmentSectionEntity",
+                "BackgroundDataEntity",
+                "BackgroundDataMetaEntity",
+                "CalculationGroupEntity",
+                "ClosingStructureEntity",
+                "ClosingStructuresCalculationEntity",
+                "ClosingStructuresFailureMechanismMetaEntity",
+                "DikeProfileEntity",
+                "DuneErosionFailureMechanismMetaEntity",
+                "DuneLocationCalculationEntity",
+                "DuneLocationCalculationForTargetProbabilityCollectionEntity",
+                "DuneLocationEntity",
+                "FailureMechanismEntity",
+                "FailureMechanismFailureMechanismSectionEntity",
+                "FailureMechanismSectionEntity",
+                "ForeshoreProfileEntity",
+                "GrassCoverErosionInwardsCalculationEntity",
+                "GrassCoverErosionInwardsFailureMechanismMetaEntity",
+                "GrassCoverErosionOutwardsFailureMechanismMetaEntity",
+                "GrassCoverErosionOutwardsWaveConditionsCalculationEntity",
+                "HeightStructureEntity",
+                "HeightStructuresCalculationEntity",
+                "HeightStructuresFailureMechanismMetaEntity",
+                "HydraulicBoundaryDataEntity",
+                "HydraulicBoundaryDatabaseEntity",
+                "HydraulicLocationCalculationCollectionEntity",
+                "HydraulicLocationCalculationCollectionHydraulicLocationCalculationEntity",
+                "HydraulicLocationCalculationEntity",
+                "HydraulicLocationCalculationForTargetProbabilityCollectionEntity",
+                "HydraulicLocationCalculationForTargetProbabilityCollectionHydraulicLocationCalculationEntity",
+                "HydraulicLocationEntity",
+                "MacroStabilityInwardsCalculationEntity",
+                "MacroStabilityInwardsCharacteristicPointEntity",
+                "MacroStabilityInwardsFailureMechanismMetaEntity",
+                "MacroStabilityInwardsFailureMechanismSectionConfigurationEntity",
+                "MacroStabilityInwardsPreconsolidationStressEntity",
+                "MacroStabilityInwardsSoilLayerOneDEntity",
+                "MacroStabilityInwardsSoilLayerTwoDEntity",
+                "MacroStabilityInwardsSoilProfileOneDEntity",
+                "MacroStabilityInwardsSoilProfileTwoDEntity",
+                "MacroStabilityInwardsSoilProfileTwoDSoilLayerTwoDEntity",
+                "MacroStabilityInwardsStochasticSoilProfileEntity",
+                "NonAdoptableFailureMechanismSectionResultEntity",
+                "PipingCharacteristicPointEntity",
+                "PipingFailureMechanismMetaEntity",
+                "PipingFailureMechanismSectionConfigurationEntity",
+                "PipingSoilLayerEntity",
+                "PipingSoilProfileEntity",
+                "PipingStochasticSoilProfileEntity",
+                "ProbabilisticPipingCalculationEntity",
+                "ProjectEntity",
+                "SemiProbabilisticPipingCalculationEntity",
+                "SpecificFailureMechanismEntity",
+                "SpecificFailureMechanismFailureMechanismSectionEntity",
+                "StabilityPointStructureEntity",
+                "StabilityPointStructuresCalculationEntity",
+                "StabilityPointStructuresFailureMechanismMetaEntity",
+                "StabilityStoneCoverFailureMechanismMetaEntity",
+                "StabilityStoneCoverWaveConditionsCalculationEntity",
+                "StochastEntity",
+                "StochasticSoilModelEntity",
+                "SurfaceLineEntity",
+                "VersionEntity",
+                "WaveImpactAsphaltCoverFailureMechanismMetaEntity",
+                "WaveImpactAsphaltCoverWaveConditionsCalculationEntity"
+            };
+
+            foreach (string table in tables)
+            {
+                string validateMigratedTable =
+                    $"ATTACH DATABASE \"{sourceFilePath}\" AS SOURCEPROJECT; " +
+                    $"SELECT COUNT() = (SELECT COUNT() FROM [SOURCEPROJECT].{table}) " +
+                    $"FROM {table};" +
+                    "DETACH SOURCEPROJECT;";
+                reader.AssertReturnedDataIsValid(validateMigratedTable);
+            }
+        }
+
+        private static void AssertLogDatabase(string logFilePath, IEnumerable<string> expectedMessages)
+        {
+            using (var reader = new MigrationLogDatabaseReader(logFilePath))
+            {
+                ReadOnlyCollection<MigrationLogMessage> messages = reader.GetMigrationLogMessages();
+
+                Assert.AreEqual(expectedMessages.Count() + 1, messages.Count);
+                var i = 0;
+                MigrationLogTestHelper.AssertMigrationLogMessageEqual(
+                    new MigrationLogMessage("25.1", newVersion, $"Gevolgen van de migratie van versie 25.1 naar versie {newVersion}:"),
+                    messages[i++]);
+
+                foreach (string expectedMessage in expectedMessages)
+                {
+                    MigrationLogTestHelper.AssertMigrationLogMessageEqual(
+                        new MigrationLogMessage("25.1", newVersion, $"{expectedMessage}"),
+                        messages[i++]);
+                }
+            }
+        }
+
+        private static void AssertVersions(MigratedDatabaseReader reader)
+        {
+            const string validateVersion =
+                "SELECT COUNT() = 1 " +
+                "FROM [VersionEntity] " +
+                "WHERE [Version] = \"26.1\";";
+            reader.AssertReturnedDataIsValid(validateVersion);
+        }
+
+        private static void AssertDatabase(MigratedDatabaseReader reader)
+        {
+            const string validateForeignKeys =
+                "PRAGMA foreign_keys;";
+            reader.AssertReturnedDataIsValid(validateForeignKeys);
+        }
+    }
+}
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