adjust test helper to current s-exp situation

also refrain from hacking the compiler
by using the constructor

test/typed/expressions/helper.rb

@@ -1,33 +1,20 @@
 require_relative '../helper'
 
-Typed::Compiler.class_eval do
-  def set_main main
-    @clazz = Register.machine.space.get_class_by_name :Object
-    @method = main
-    @current = main.instructions.next
-  end
-end
-
 module ExpressionHelper
 
-  def set_main compiler
-    compiler.set_main Register.machine.space.get_main
-  end
   def check
-    machine = Register.machine
-    machine.boot unless machine.booted
-    compiler = Typed::Compiler.new
-    set_main(compiler)
+    Register.machine.boot unless Register.machine.booted
+    compiler = Typed::Compiler.new Register.machine.space.get_main
     code = Typed.ast_to_code @input
     produced = compiler.process( code )
     assert @output , "No output given"
-    assert_equal  produced.class , @output , "Wrong class"
+    assert_equal produced.class , @output , "Wrong class"
     produced
   end
 
   # test hack to in place change object type
-  def add_object_field(name,type)
-    class_type = Register.machine.space.get_class_by_name(:Object).instance_type
+  def add_space_field(name,type)
+    class_type = Register.machine.space.get_class_by_name(:Space).instance_type
     class_type.send(:private_add_instance_variable, name , type)
   end
 end