finishes the yellow world instructions

test/interpreter_test.rb

@@ -53,17 +53,30 @@ class InterpreterTest < MiniTest::Test
     ["Branch" , "LoadConstant" , "GetSlot" , "SetSlot" , "RegisterTransfer" ,
      "GetSlot" , "FunctionCall" , "SaveReturn" , "LoadConstant"  , "SetSlot" ,
      "GetSlot" ,  "GetSlot" , "SetSlot" , "LoadConstant" , "SetSlot" ,
-     "RegisterTransfer" ,  "GetSlot" ,  "FunctionCall" , "SaveReturn" ,
-     "RegisterTransfer" , "Syscall"].each_with_index do |name , index|
+     "RegisterTransfer" ,  "GetSlot" ,  "FunctionCall" , "SaveReturn" , "RegisterTransfer" ,
+     "Syscall" , "RegisterTransfer" , "RegisterTransfer" , "SetSlot" , "GetSlot" ,
+     "GetSlot" , "RegisterTransfer" ,"GetSlot" , "GetSlot","GetSlot",
+     "FunctionReturn" , "RegisterTransfer" , "Syscall" , "NilClass"].each_with_index do |name , index|
       got = ticks(1)
-      assert got.class.name.index(name) , "Wrong class for #{index}, expect #{name} , got #{got}"
+      assert got.class.name.index(name) , "Wrong class for #{index+1}, expect #{name} , got #{got}"
     end
   end
 
   def test_putstring
     done = ticks(21)
     assert_equal Register::Syscall ,  done.class
-    assert_equal "Hello again" , @interpreter.stdout  
+    assert_equal "Hello again" , @interpreter.stdout
   end
 
+  def test_return
+    done = ticks(31)
+    assert_equal Register::FunctionReturn ,  done.class
+    assert @interpreter.block.is_a?(Virtual::Block)
+    assert @interpreter.instruction.is_a?(Register::Instruction) , "not instruction #{@interpreter.instruction}"
+  end
+
+  def test_exit
+    done = ticks(34)
+    assert_equal NilClass ,  done.class
+  end
 end