fix fragment tests to actually execute on the pi and check the output

test/fragments/helper.rb

@@ -37,12 +37,17 @@ module Fragments
     writer = Elf::ObjectWriter.new(@program , Elf::Constants::TARGET_ARM)
     assembly = writer.text
     # use this for getting the bytes to compare to :  
-    #puts assembly
+    puts assembly
     writer.save("#{name}.o")
     assembly.text.bytes.each_with_index do |byte , index|
       is = @should[index]
       assert_equal  Fixnum , is.class , "@#{index.to_s(16)} = #{is}"
       assert_equal  byte , is  , "@#{index.to_s(16)} #{byte.to_s(16)} != #{is.to_s(16)}"
     end
+    if( RbConfig::CONFIG["build_cpu"] == "arm")
+      system "ld -N #{name}.o"
+      result = %x[./a.out]
+      assert_equal @output , result
+    end
   end
 end