Add tests for workflow result variable

test/integration/Elsa.IntegrationTests/Scenarios/WorkflowResults/Tests.cs

@@ -0,0 +1,66 @@
+using System.Threading.Tasks;
+using Elsa.Testing.Shared;
+using Elsa.Workflows.Core.Activities;
+using Elsa.Workflows.Core.Contracts;
+using Elsa.Workflows.Core.Models;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Elsa.IntegrationTests.Scenarios.WorkflowResults;
+
+public class Tests
+{
+    private readonly IWorkflowRunner _workflowRunner;
+    private readonly CapturingTextWriter _capturingTextWriter = new();
+
+    public Tests(ITestOutputHelper testOutputHelper)
+    {
+        var services = new TestApplicationBuilder(testOutputHelper).WithCapturingTextWriter(_capturingTextWriter).Build();
+        _workflowRunner = services.GetRequiredService<IWorkflowRunner>();
+    }
+
+    [Fact(DisplayName = "Setting a named variable should be captured when the ResultVariable is set")]
+    public async Task Test1()
+    {
+        var expectedValue = "Some value";
+        var variableName = "MyVar";
+        
+        var workflow = Workflow.FromActivity(new Sequence
+        {
+            Activities =
+            {
+                new SetVariable()
+                {
+                    Variable = new (variableName),
+                    Value = new (expectedValue)
+                }
+            }
+        });
+        workflow.ResultVariable = new (variableName);
+        var runWorkflowResult = await _workflowRunner.RunAsync(workflow);
+        Assert.Equal(expectedValue, runWorkflowResult.Result);
+    }
+    
+    [Fact(DisplayName = "Setting a variable should be captured when the ResultVariable is set")]
+    public async Task Test2()
+    {
+        var expectedValue = "Some value";
+        var variable = new Variable<string>();
+        
+        var workflow = Workflow.FromActivity(new Sequence
+        {
+            Activities =
+            {
+                new SetVariable()
+                {
+                    Variable = variable,
+                    Value = new (expectedValue)
+                }
+            }
+        });
+        workflow.ResultVariable = variable;
+        var runWorkflowResult = await _workflowRunner.RunAsync(workflow);
+        Assert.Equal(expectedValue, runWorkflowResult.Result);
+    }
+}