Add MapActionTest to Routing.FunctionalTests

Author: halter73

src/Http/Routing/test/FunctionalTests/MapActionTest.cs

@@ -0,0 +1,92 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.Net.Http.Json;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Api;
+using Microsoft.AspNetCore.Mvc.Routing;
+using Microsoft.AspNetCore.TestHost;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Routing.FunctionalTests
+{
+    public class MapActionTest
+    {
+        [Fact]
+        public async Task MapAction_FromBodyWorksWithJsonPayload()
+        {
+            [HttpPost("/EchoTodo")]
+            Todo EchoTodo([FromBody] Todo todo) => todo;
+
+            using var host = new HostBuilder()
+                .ConfigureWebHost(webHostBuilder =>
+                {
+                    webHostBuilder
+                        .Configure(app =>
+                        {
+                            app.UseRouting();
+                            app.UseEndpoints(b => b.MapAction((Func<Todo, Todo>)EchoTodo));
+                        })
+                        .UseTestServer();
+                })
+                .ConfigureServices(services =>
+                {
+                    services.AddAuthorization();
+                    services.AddRouting();
+                })
+                .Build();
+
+            using var server = host.GetTestServer();
+            await host.StartAsync();
+            var client = server.CreateClient();
+
+            var todo = new Todo
+            {
+                Name = "Custom Todo"
+            };
+
+            var response = await client.PostAsJsonAsync("/EchoTodo", todo);
+            response.EnsureSuccessStatusCode();
+
+            var echoedTodo = await response.Content.ReadFromJsonAsync<Todo>();
+
+            Assert.Equal(todo.Name, echoedTodo?.Name);
+        }
+
+        private class Todo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; } = "Todo";
+            public bool IsComplete { get; set; }
+        }
+
+        private class FromBodyAttribute : Attribute, IFromBodyMetadata { }
+
+        private class HttpPostAttribute : Attribute, IRouteTemplateProvider, IHttpMethodMetadata
+        {
+            public HttpPostAttribute(string template)
+            {
+                Template = template;
+            }
+
+            public string Template { get; }
+
+            public IReadOnlyList<string> HttpMethods { get; } = new[] { "POST" };
+
+            public int? Order => null;
+
+            public string? Name => null;
+
+            public bool AcceptCorsPreflight => false;
+        }
+    }
+}