Fix expectation for newer versions of rack. See
https://github.com/raggi/async_sinatra/issues/#issue/10

--- test/test_async.rb.~1~	2011-02-20 15:05:47.480108199 +0100
+++ test/test_async.rb	2011-02-20 15:09:38.494594250 +0100
@@ -96,8 +96,7 @@
   
   def assert_redirect(path)
     r = last_request.env
-    uri = r['rack.url_scheme'] + '://' + r['SERVER_NAME'] + path
-    assert_equal uri, last_response.location
+    assert_equal path, last_response.location
   end
 
   def test_basic_async_get
@@ -194,4 +193,4 @@
     assert_equal 302, last_response.status
     assert_redirect '/'
   end
-end
\ No newline at end of file
+end