test to prove that 305 works. Closes GH-305

src/Persistence/PersistenceTests/Marten/Bugs/Bug_305_invoke_async_with_return_not_publishing_with_tuple_return_value.cs

@@ -0,0 +1,81 @@
+using IntegrationTests;
+using Marten;
+using Microsoft.Extensions.Hosting;
+using Shouldly;
+using Wolverine;
+using Wolverine.Marten;
+using Wolverine.Tracking;
+using Xunit;
+
+namespace PersistenceTests.Marten.Bugs;
+
+public class Bug_305_invoke_async_with_return_not_publishing_with_tuple_return_value : PostgresqlContext
+{
+    [Fact]
+    public async Task should_publish_the_return_value()
+    {
+        using var host = await Host.CreateDefaultBuilder()
+            .UseWolverine(opts =>
+            {
+                opts.Services.AddMarten(Servers.PostgresConnectionString).IntegrateWithWolverine();
+                // Add the auto transaction middleware attachment policy
+                opts.Policies.AutoApplyTransactions();
+            }).StartAsync();
+
+        var (tracked, created) = await host.InvokeMessageAndWaitAsync<ItemCreated>(new CreateItemCommand { Name = "Trevor" });
+
+        created.Name.ShouldBe("Trevor");
+
+        tracked.Sent.SingleMessage<ItemCreated>().Name.ShouldBe("Trevor");
+        tracked.Sent.SingleMessage<SecondItemCreated>().Name.ShouldBe("Trevor");
+    }
+}
+
+public class CreateItemCommand
+{
+    public string Name { get; set; } = string.Empty;
+}
+
+public class CreateItemCommandHandler
+{
+    public async Task<(ItemCreated, SecondItemCreated)> Handle(CreateItemCommand command, IDocumentSession session)
+    {
+        var item = new Item
+        {
+            Id = Guid.NewGuid(),
+            Name = command.Name
+        };
+
+        session.Store(item);
+
+        return (new ItemCreated(item.Id, item.Name), new SecondItemCreated(item.Id, item.Name));
+    }
+}
+
+public record ItemCreated(Guid Id, string Name);
+
+public record SecondItemCreated(Guid Id, string Name);
+
+public class ItemCreatedHandler
+{
+    public Task Handle(ItemCreated message)
+    {
+        Console.WriteLine($"Item created {message.Id} {message.Name}");
+        return Task.CompletedTask;
+    }
+}
+
+public class SecondItemCreatedHandler
+{
+    public Task Handle(SecondItemCreated message)
+    {
+        Console.WriteLine($"Second Item created {message.Id} {message.Name}");
+        return Task.CompletedTask;
+    }
+}
+
+public class Item
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+}