Testing asp.net 5 vnext middleware from a TestServer - unit-testing

Question

In owin, its possible to test a web api in unit test using a TestServer (see this blog).
Is this functionality available for asp.net 5 middleware ?
UPDATE:
based on responses below, I tried to use TestServer, but visual studio complains that 'The type or namespace name 'AspNet' does not exist in the namespace 'Microsoft' (are you .....'
I use Visual Studio 2015
in my nuget sources (settings) I have (https://www.myget.org/F/aspnetmaster/)
(I also tried with https://www.myget.org/F/aspnetvnext/, but got the same problem)
here is my project.json file
{
"version": "1.0.0-*",
"dependencies": {
"Microsoft.AspNet.Http": "1.0.0-*",
"Microsoft.AspNet.TestHost": "1.0.0-*",
"Microsoft.AspNet.Hosting": "1.0.0-*",
"Microsoft.AspNet.Testing" : "1.0.0-*",
"xunit": "2.1.0-beta1-*",
"xunit.runner.aspnet": "2.1.0-beta1-*",
"Moq": "4.2.1312.1622",
"Shouldly": "2.4.0"
},
"commands": {
"test": "xunit.runner.aspnet"
},
"frameworks" : {
"aspnet50" : {
"dependencies": {
}
}
}
}

Answer 1

It is available on ASP.NET 5 as well: Microsoft.AspNet.TestHost.
Here is a sample. Middleware:
public class DummyMiddleware
{
private readonly RequestDelegate _next;
public DummyMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context)
{
Console.WriteLine("DummyMiddleware");
context.Response.ContentType = "text/html";
context.Response.StatusCode = 200;
await context.Response.WriteAsync("hello world");
}
}
Test:
[Fact]
public async Task Should_give_200_Response()
{
var server = TestServer.Create((app) =>
{
app.UseMiddleware<DummyMiddleware>();
});
using(server)
{
var response = await server.CreateClient().GetAsync("/");
Assert.Equal(HttpStatusCode.OK, response.StatusCode);
}
}
You can find more about the usage of the TestServer class on the tests.