start implementing return for constant

test/vool/to_mom/test_local.rb

@@ -18,7 +18,7 @@ module Vool
     def test_slot_starts_at_message
       assert_equal :message , @stats.first.left[0]
     end
-    def test_slot_gets_self
+    def test_slot_gets_frame
       assert_equal :frame , @stats.first.left[1]
     end
     def test_slot_assigns_to_local

test/vool/to_mom/test_return.rb

@@ -0,0 +1,31 @@
+require_relative "helper"
+
+module Vool
+  class TestReturnMom < MiniTest::Test
+    include MomCompile
+
+    def setup
+      Risc.machine.boot
+      @stats = compile_first_method( "return 5").first
+    end
+
+    def test_class_compiles
+      assert_equal Mom::SlotConstant , @stats.first.class , @stats
+    end
+    def test_slot_is_set
+      assert @stats.first.left
+    end
+    def test_slot_starts_at_message
+      assert_equal :message , @stats.first.left[0]
+    end
+    def test_slot_gets_self
+      assert_equal :return_value , @stats.first.left[1]
+    end
+    def test_slot_assigns_something
+      assert @stats.first.right
+    end
+    def test_slot_assigns_int
+      assert_equal IntegerStatement ,  @stats.first.right.class
+    end
+  end
+end