make the interpreter platform

but still using the risc_instruction stream

test/risc/test_platform.rb

@@ -3,23 +3,14 @@ require_relative "../helper"
 module Risc
   class TestPlaform < MiniTest::Test
 
-    def test_factory_exists
+    def test_arm_factory_exists
       assert Platform.for("Arm")
     end
+    def test_inter_factory_exists
+      assert Platform.for("Interpreter")
+    end
     def test_factory_raise
       assert_raises{ Platform.for("NotArm")}
     end
-    def test_platform_class
-      arm = Platform.for("Arm")
-      assert_equal Arm::ArmPlatform , arm.class
-    end
-    def test_platform_translator_class
-      arm = Platform.for("Arm")
-      assert_equal Arm::Translator , arm.translator.class
-    end
-    def test_platform_loaded_class
-      arm = Platform.for("Arm")
-      assert_equal Fixnum , arm.loaded_at.class
-    end
   end
 end