Modify box download test to pass properly on non-windows machines

test/vagrant/actions/box/download_test.rb

@@ -107,6 +107,9 @@ class DownloadBoxActionTest < Test::Unit::TestCase
 
   context "file options" do
     should "include add binary bit to options on windows platform" do
+      # This constant is not defined on non-windows platforms, so define it here
+      File::BINARY = 4096 unless defined?(File::BINARY)
+
       Mario::Platform.expects(:windows?).returns(true)
       assert_equal @action.file_options, File::CREAT|File::EXCL|File::WRONLY|File::BINARY
     end