public static async Task <TestHandler> Create(string scheme)
{
var handler = new TestHandler();
var context = new DefaultHttpContext();
context.Features.Set <IHttpResponseFeature>(new TestResponse());
await handler.InitializeAsync(new TestOptions(), context, new LoggerFactory().CreateLogger("TestHandler"), Framework.WebEncoders.UrlEncoder.Default);
handler.Options.AuthenticationScheme = scheme;
return(handler);
}