Fix regression introduced with cab1e4e

lib/vagrant/action/box/download.rb

@@ -39,6 +39,7 @@ module Vagrant
             if classes.length == (i + 1) || klass.match?(@env["box"].uri)
               @env.ui.info I18n.t("vagrant.actions.box.download.with", :class => klass.to_s)
               @downloader = klass.new(@env)
+              break
             end
           end
 

test/unit/vagrant/action/box/download_test.rb

@@ -39,9 +39,9 @@ class DownloadBoxActionTest < Test::Unit::TestCase
         assert @instance.instantiate_downloader
       end
 
-      should "error environment if URI is invalid for any downloaders" do
+      should "complain that the file doesn't exist if the URI is invalid for any downloaders" do
         @env["box"].uri = "foobar"
-        assert_raises(Vagrant::Errors::BoxDownloadUnknownType) {
+        assert_raises(Vagrant::Errors::DownloaderFileDoesntExist) {
           @instance.instantiate_downloader
         }
       end