add module names and instance variables as parse rules

test/parser/test_basic.rb

@@ -18,6 +18,34 @@ class TestBasic < MiniTest::Test
     @parser = @parser.name
   end
 
+  def test_name_underscode_start
+    @string_input    = '_bar '
+    @parse_output = {:name => '_bar'}
+    @transform_output = Ast::NameExpression.new('_bar')
+    @parser = @parser.name
+  end
+
+  def test_name_underscode_middle
+    @string_input    = 'foo_bar '
+    @parse_output = {:name => 'foo_bar'}
+    @transform_output = Ast::NameExpression.new('foo_bar')
+    @parser = @parser.name
+  end
+
+  def test_instance_variable
+    @string_input    = '@foo_bar '
+    @parse_output = {:instance_variable=>{:name=>"foo_bar"}}
+    @transform_output = Ast::VariableExpression.new('foo_bar')
+    @parser = @parser.instance_variable
+  end
+
+  def test_module_name
+    @string_input    = 'FooBar '
+    @parse_output = {:module_name=>"FooBar"}
+    @transform_output = Ast::ModuleName.new("FooBar")
+    @parser = @parser.module_name
+  end
+
   def test_comment
     out = "# i am a comment \n"
     @string_input    =  out.dup #NEEDS the return, which is what delimits the comment