create and test derived classes too

test/melon/compiler/test_class.rb

@@ -3,15 +3,20 @@ require_relative "helper"
 module Melon
   class TestClass < MiniTest::Test
 
-    def test_creates_class
-      Register.machine.boot
-      before = Parfait::Space.object_space.classes.length
-      @string_input = <<HERE
-class Testing
-end
-HERE
-      Compiler.compile @string_input
-      assert_equal 1 ,  Parfait::Space.object_space.classes.length - before , "No classes created"
+    def setup
+      Register.machine.boot unless Register.machine.booted
     end
+    def test_creates_class_without_deriviation
+      Compiler.compile "class Testing ; end"
+      assert t = Parfait::Space.object_space.get_class_by_name(:Testing) , "No classes created"
+      assert_equal :Object , t.super_class_name
+    end
+
+    def test_creates_class_with_deriviation
+     Compiler.compile  "class Test2 < List ;end"
+      assert t = Parfait::Space.object_space.get_class_by_name(:Test2) , "No classes created"
+      assert_equal :List , t.super_class_name
+    end
+
   end
 end