[Fixes #4099] Add a functional test for creating a form with a file upload field

test/Microsoft.AspNetCore.Mvc.FunctionalTests/FormFileUploadTest.cs

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+// 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.
+
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Mvc.FunctionalTests
+{
+    public class FormFileUploadTest : IClassFixture<MvcTestFixture<FilesWebSite.Startup>>
+    {
+        public FormFileUploadTest(MvcTestFixture<FilesWebSite.Startup> fixture)
+        {
+            Client = fixture.Client;
+        }
+
+        public HttpClient Client { get; }
+
+        [Fact]
+        public async Task CanUploadFileInFrom()
+        {
+            // Arrange
+            var content = new MultipartFormDataContent();
+            content.Add(new StringContent("John"), "Name");
+            content.Add(new StringContent("23"), "Age");
+            content.Add(new StringContent("John's biography content"), "Biography", "Bio.txt");
+
+            var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/UploadFiles");
+            request.Content = content;
+
+            // Act
+            var response = await Client.SendAsync(request);
+
+            // Assert
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var user = await response.Content.ReadAsAsync<User>();
+
+            Assert.Equal("John", user.Name);
+            Assert.Equal(23, user.Age);
+            Assert.Equal("John's biography content", user.Biography);
+        }
+
+        private class User
+        {
+            public string Name { get; set; }
+            public int Age { get; set; }
+            public string Biography { get; set; }
+        }
+    }
+}

test/WebSites/FilesWebSite/Controllers/UploadFilesController.cs

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+// 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.
+
+using System.Threading.Tasks;
+using FilesWebSite.Models;
+using Microsoft.AspNetCore.Mvc;
+
+namespace FilesWebSite.Controllers
+{
+    public class UploadFilesController : Controller
+    {
+        [HttpPost("UploadFiles")]
+        public async Task<IActionResult> Post(User user)
+        {
+            var resultUser = new
+            {
+                Name = user.Name,
+                Age = user.Age,
+                Biography = await user.ReadBiography()
+            };
+
+            return Json(resultUser);
+        }
+    }
+}

test/WebSites/FilesWebSite/Models/User.cs

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+// 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.
+
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+
+namespace FilesWebSite.Models
+{
+    public class User
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+        public IFormFile Biography { get; set; }
+
+        public async Task<string> ReadBiography()
+        {
+            if (Biography != null)
+            {
+                using (var reader = new StreamReader(Biography.OpenReadStream()))
+                {
+                    return await reader.ReadToEndAsync();
+                }
+            }
+
+            return null;
+        }
+    }
+}