public void When_using_strongly_typed_OnSendingHeaders_it_should_be_invoked_at_sending_headers()
{
var owinResponse = new OwinResponse();
owinResponse.Environment["server.OnSendingHeaders"] = new Action <Action <object>, object>((action, obj) => action(obj));
owinResponse.OnSendingHeaders(str =>
{
str.ShouldBeTypeOf(typeof(string));
str.ShouldBe("Strongly typed!");
}, "Strongly typed!");
}