rework binary code positioning setup

dependency chain set up explicitly.
Next have to react to events correctly

test/risc/position/test_code_listener.rb

@@ -12,8 +12,12 @@ module Risc
       end
 
       def test_has_init
-        CodeListener.init(@binary)
-        assert Position.get(@binary)
+        pos = CodeListener.init(@binary)
+        assert_equal pos, Position.get(@binary)
+      end
+      def test_init_returns_position
+
+        assert_equal Position::ObjectPosition , CodeListener.init(@binary).class
       end
       def test_init_listner
         @binary.extend_one

test/risc/position/test_object_position.rb

@@ -6,7 +6,12 @@ module Risc
     class TestPositionBasic < MiniTest::Test
 
       def test_init
-        assert_equal ObjectPosition.init(self)
+        assert ObjectPosition.init(self , -1)
+      end
+      def test_next_slot
+        mov = Arm::ArmMachine.mov(:r1 , :r1)
+        position = ObjectPosition.new(mov , 0)
+        assert_equal 4, position.next_slot
       end
       def pest_creation_ok
         assert ObjectPosition.new(self,0)