seperate different Position classes into own files

also tests
and have Position module keep all positions
(singletons should be at module, not class level)

test/risc/position/test_object_position.rb

@@ -0,0 +1,47 @@
+require_relative "../helper"
+
+module Risc
+  module Position
+    # tests that do no require a boot and only test basic positioning
+    class TestPositionBasic < MiniTest::Test
+
+      def test_creation_ok
+        assert ObjectPosition.new(0)
+      end
+      def test_creation_fail
+        assert_raises {Position.new("0")}
+      end
+      def test_add
+        res = ObjectPosition.new(0) + 5
+        assert_equal 5 , res
+      end
+      def test_sub
+        res = ObjectPosition.new(5) - 1
+        assert_equal 4 , res
+      end
+      def test_sub_pos
+        res = ObjectPosition.new(5) - ObjectPosition.new(1)
+        assert_equal 4 , res
+      end
+      def test_set
+        pos = Position.set(self , 5)
+        assert_equal 5 , pos.at
+      end
+      def tet_tos
+        assert_equal "0x10" , Position.set(self).to_s
+      end
+      def test_reset_ok
+        pos = Position.set(self , 5)
+        pos = Position.set(self , 10)
+        assert_equal 10 , pos.at
+      end
+      def test_reset_fail
+        Position.set(self , 5)
+        assert_raises{Position.set(self , 10000)}
+      end
+      def test_raises_set_nil
+        assert_raises { Position.set(self,nil)}
+      end
+    end
+  end
+end