more assignment tests

move to writing code to Test class
To use space as before one would have to implement re-opening classes

test/mom/helper.rb

@@ -28,8 +28,9 @@ module Risc
     end
     def produce_instructions
       assert @expect , "No output given"
-      Vool::VoolCompiler.ruby_to_vool "class Space; def main(arg);#{@input};end;end"
+      Vool::VoolCompiler.ruby_to_vool "class Test; def main(arg);#{@input};end;end"
-      Parfait.object_space.get_main.instructions
+      test = Parfait.object_space.get_class_by_name :Test
+      test.instance_type.get_method( :main).instructions
     end
     def check_nil
       produced = produce_instructions
@@ -38,7 +39,8 @@ module Risc
     def check_return
       was = check_nil
       raise was if was
-      Parfait.object_space.get_main.instructions
+      test = Parfait.object_space.get_class_by_name :Test
+      test.instance_type.get_method :main
     end
     def real_index(index)
       index - preamble.length

test/mom/test_assign_ivar_const.rb

@@ -0,0 +1,27 @@
+require_relative 'helper'
+
+module Risc
+  class TestAssignIvarConst < MiniTest::Test
+    include Statements
+
+    def setup
+      super
+      @input = "@ivar = 5"
+      @expect = [LoadConstant, RegToSlot]
+    end
+    def test_local_assign_instructions
+      assert_nil msg = check_nil , msg
+    end
+
+    def test_constant_load
+      produced = produce_body
+      assert_equal 5 , produced.constant.known_object.value
+    end
+
+    def test_slot_move
+      produced = produce_body
+      assert_equal produced.next.register , produced.register
+    end
+
+  end
+end

test/mom/test_assign_local_ivar.rb

@@ -0,0 +1,27 @@
+require_relative 'helper'
+
+module Risc
+  class TestAssignLocalIvar < MiniTest::Test
+    include Statements
+
+    def setup
+      super
+      @input = "@ivar = 5 ; r = @ivar"
+      @expect = [LoadConstant, RegToSlot, SlotToReg, SlotToReg, RegToSlot]
+    end
+    def test_local_assign_instructions
+      assert_nil msg = check_nil , msg
+    end
+
+    def test_constant_load
+      produced = produce_body
+      assert_equal 5 , produced.constant.known_object.value
+    end
+
+    def test_slot_move
+      produced = produce_body
+      assert_equal produced.next.register , produced.register
+    end
+
+  end
+end