change to position objects complete

test/elf/test_hello.rb

@@ -2,6 +2,9 @@ require_relative "../helper"
 
 class HelloTest < MiniTest::Test
 
+  def setup
+    Risc.machine
+  end
   def check
     Vool::VoolCompiler.ruby_to_binary( "class Space;def main(arg);#{@input};end;end" )
     writer = Elf::ObjectWriter.new(Risc.machine)

test/risc/test_position.rb

@@ -17,10 +17,17 @@ module Risc
       res = Position.new(5) - 1
       assert_equal 4 , res
     end
+    def test_sub_pos
+      res = Position.new(5) - Position.new(1)
+      assert_equal 4 , res
+    end
     def test_set
       pos = Position.set_position(self , 5)
       assert_equal 5 , pos.at
     end
+    def tet_tos
+      assert_equal "0x10" , Position.set_position(self).to_s
+    end
     def test_reset_ok
       pos = Position.set_position(self , 5)
       pos = Position.set_position(self , 10)