Add project files.

test/integration/Elsa.Alterations.IntegrationTests/MigrationTests.cs

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+using Elsa.Alterations.AlterationTypes;
+using Elsa.Alterations.Core.Contracts;
+using Elsa.Alterations.Extensions;
+using Elsa.Common.Models;
+using Elsa.Extensions;
+using Elsa.Testing.Shared;
+using Elsa.Workflows.Management;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit.Abstractions;
+
+namespace Elsa.Alterations.IntegrationTests;
+
+/// <summary>
+/// Contains tests for migration.
+/// </summary>
+public class MigrationTests
+{
+    private readonly CapturingTextWriter _capturingTextWriter = new();
+    private readonly IServiceProvider _services;
+    private readonly IAlterationRunner _alterationRunner;
+    private readonly IWorkflowInstanceStore _workflowInstanceStore;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MigrationTests"/> class.
+    /// </summary>
+    public MigrationTests(ITestOutputHelper testOutputHelper)
+    {
+        _services = new TestApplicationBuilder(testOutputHelper)
+            .WithCapturingTextWriter(_capturingTextWriter)
+            .ConfigureElsa(elsa => elsa.UseAlterations())
+            .Build();
+        _alterationRunner = _services.GetRequiredService<IAlterationRunner>();
+        _workflowInstanceStore = _services.GetRequiredService<IWorkflowInstanceStore>();
+    }
+
+    /// <summary>
+    /// This method tests the migration from version 1 to version 2.
+    /// </summary>
+    [Fact(DisplayName = "Migrating from version 1 to 2 succeeds")]
+    public async Task Test1()
+    {
+        // Populate registries.
+        await _services.PopulateRegistriesAsync();
+
+        // Import workflows.
+        await _services.ImportWorkflowDefinitionAsync("Workflows/version-1.json");
+        await _services.ImportWorkflowDefinitionAsync("Workflows/version-2.json");
+
+        // Run version 1 workflow.
+        var workflowState = await _services.RunWorkflowUntilEndAsync("my-workflow", versionOptions: VersionOptions.SpecificVersion(1));
+
+        // Migrate to version 2.
+        var alterations = new IAlteration[]
+        {
+            new Migrate
+            {
+                TargetVersion = 2
+            }
+        };
+        var instanceIds = new[]
+        {
+            workflowState.Id
+        };
+        var migrationResult = await _alterationRunner.RunAsync(instanceIds, alterations);
+        
+        // Assert success.
+        Assert.True(migrationResult.All(x => x.IsSuccessful));
+        
+        // Assert that the workflow instance is now at version 2.
+        var workflowState2 = await _workflowInstanceStore.FindAsync(workflowState.Id);
+        Assert.Equal(2, workflowState2!.Version);
+    }
+}