start on yield statement

test/vool/ruby_compiler/test_yield_statement.rb

@@ -0,0 +1,27 @@
+require_relative "helper"
+
+module Vool
+  class TestYieldStatement < MiniTest::Test
+
+    def setup()
+      input = "def plus_one; yield(0) ; end "
+      @lst = RubyCompiler.compile( input )
+    end
+    def test_method
+      assert_equal MethodStatement , @lst.class
+    end
+    def test_block
+      assert_equal YieldStatement , @lst.body.class
+    end
+    def test_block_args
+      assert_equal IntegerConstant , @lst.body.arguments.first.class
+    end
+    def test_method_yield?
+      assert_equal true , @lst.has_yield?
+    end
+    def test_method_args
+      Risc.machine.boot
+      assert_equal 2 , @lst.make_arg_type.get_length
+    end
+  end
+end