diff --git a/test/parser/README.markdown b/test/parser/README.markdown
new file mode 100644
index 00000000..c8f03015
--- /dev/null
+++ b/test/parser/README.markdown
@@ -0,0 +1,33 @@
+Parsing
+-------
+
+Some sanity is emerging in the testing of parsers 
+    (Parsers are fiddly in respect to space and order, small changes may and do have unexpected effects)
+
+Parsing is a two step process with parslet:
+  - parse takes an input and outputs hashes/arrays with basic types
+  - tramsform takes the output of parse and generates an ast (as specified by the transformation)
+
+A test tests both phases seperately and again together.
+Each test must thus specify (as instance variables):
+- the string input
+- the parse output
+- the transform output
+
+
+For any functionality that we want to work (ie test), there are actually three tests, with the _same_ name
+One in each of the parser/transform/ast classes
+Parser test that the parser parses and thet the output is correct. Rules are named and and boil down to 
+       hashes and arrays with lots of symbols for the names the rules (actually the reults) were given
+Transform test really just test the tranformation. They basically take the output of the parse
+        and check that correct Ast classes are produced
+Ast   tests both steps in one. Ie string input to ast classes output
+
+All threee classes are layed out quite similarly in that they use a check method and 
+each test assigns @input and @expected which the check methods then checks
+The check methods have a pust in it (to be left) which is very handy for checking
+also the output of parser.check can actually be used as the input of transform
+
+Repeat: For every test in parser, there should be one in transform and ast
+                                 The test in transform should use the output of parser as input
+                                 The test in ast should expect the same result as transform
diff --git a/test/parser/helper.rb b/test/parser/helper.rb
new file mode 100644
index 00000000..3cc8f1ca
--- /dev/null
+++ b/test/parser/helper.rb
@@ -0,0 +1,29 @@
+require_relative "../helper"
+
+module ParserTest
+  
+  def setup
+    @parser    = Parser::Composed.new
+    @transform = Parser::Transform.new
+  end
+
+  def check_parse
+    is = @parser.parse(@input)
+    #puts is.inspect
+    assert_equal @expected , is
+  end
+
+  def check_transform
+    is = @transform.apply @input
+    #puts is.transform
+    assert_equal @expected , is
+  end
+
+  def check_ast
+    syntax    = @parser.parse(@input)
+    tree      = @transform.apply(syntax)
+    # puts tree.inspect
+    assert_equal @expected , tree
+  end
+  
+end
\ No newline at end of file
diff --git a/test/test_ast.rb b/test/test_ast.rb
index c01c3708..5bfda4fd 100644
--- a/test/test_ast.rb
+++ b/test/test_ast.rb
@@ -15,19 +15,19 @@ class TestAst < MiniTest::Test
     syntax    = @parser.parse(@input)
     tree      = @transform.apply(syntax)
     # puts tree.inspect
-    assert_equal @expected , tree
+    assert_equal @transform_output , tree
   end
   
   def test_number
     @input    = '42 '
-    @expected = Parser::IntegerExpression.new(42)
+    @transform_output = Parser::IntegerExpression.new(42)
     @parser = @parser.integer
     check
   end
 
   def test_name
     @input    = 'foo '
-    @expected = Parser::NameExpression.new('foo')
+    @transform_output = Parser::NameExpression.new('foo')
     @parser = @parser.name
     check
   end
@@ -36,21 +36,21 @@ class TestAst < MiniTest::Test
     @input    = <<HERE
 "hello" 
 HERE
-    @expected =  Parser::StringExpression.new('hello')
+    @transform_output =  Parser::StringExpression.new('hello')
     @parser = @parser.string
     check
   end
 
   def test_one_argument
     @input    = '(42)'
-    @expected = { :argument_list => Parser::IntegerExpression.new(42) }
+    @transform_output = { :argument_list => Parser::IntegerExpression.new(42) }
     @parser = @parser.argument_list
     check
   end
 
   def test_argument_list
     @input    = '(42, foo)'
-    @expected = [Parser::IntegerExpression.new(42),
+    @transform_output = [Parser::IntegerExpression.new(42),
                 Parser::NameExpression.new('foo')]
     @parser = @parser.argument_list
     check
@@ -58,7 +58,7 @@ HERE
 
   def test_function_call
     @input = 'baz(42, foo)'
-    @expected = Parser::FuncallExpression.new 'baz', [Parser::IntegerExpression.new(42),
+    @transform_output = Parser::FuncallExpression.new 'baz', [Parser::IntegerExpression.new(42),
                                           Parser::NameExpression.new('foo')]
 
     @parser = @parser.function_call
@@ -71,7 +71,7 @@ HERE
 5
 else
 HERE
-    @expected = {:expressions=>[ Parser::IntegerExpression.new(4), Parser::IntegerExpression.new(5)]}
+    @transform_output = {:expressions=>[ Parser::IntegerExpression.new(4), Parser::IntegerExpression.new(5)]}
     
     @parser = @parser.expressions_else
     check
@@ -84,7 +84,7 @@ name
 call(4,6)
 end
 HERE
-    @expected = {:expressions=> [Parser::IntegerExpression.new(5), Parser::NameExpression.new("name"),
+    @transform_output = {:expressions=> [Parser::IntegerExpression.new(5), Parser::NameExpression.new("name"),
       Parser::FuncallExpression.new("call", [Parser::IntegerExpression.new(4), Parser::IntegerExpression.new(6) ]) ] }
     @parser = @parser.expressions_end
     check
@@ -98,7 +98,7 @@ else
   667
 end
 HERE
-    @expected = Parser::ConditionalExpression.new(  Parser::IntegerExpression.new(0),
+    @transform_output = Parser::ConditionalExpression.new(  Parser::IntegerExpression.new(0),
                                             [Parser::IntegerExpression.new(42)],
                                             [Parser::IntegerExpression.new(667)])
     @parser = @parser.conditional
@@ -111,7 +111,7 @@ def foo(x)
   5
 end
 HERE
-    @expected = Parser::FunctionExpression.new('foo', 
+    @transform_output = Parser::FunctionExpression.new('foo', 
                   [Parser::NameExpression.new('x')], 
                   [Parser::IntegerExpression.new(5)])
     @parser = @parser.function_definition
@@ -123,7 +123,7 @@ def foo(x)
  abba = 5 
 end
 HERE
-    @expected = Parser::FunctionExpression.new( "foo", [Parser::NameExpression.new("x")],
+    @transform_output = Parser::FunctionExpression.new( "foo", [Parser::NameExpression.new("x")],
                        [Parser::AssignmentExpression.new( "abba", Parser::IntegerExpression.new(5) ) ])
     check
   end
diff --git a/test/test_parser.rb b/test/test_parser.rb
index c5ec0dea..ed4f51dc 100644
--- a/test/test_parser.rb
+++ b/test/test_parser.rb
@@ -12,7 +12,7 @@ require_relative 'helper'
 # Ast   tests both steps in one. Ie string input to ast classes output
 
 # All threee classes are layed out quite similarly in that they use a check method and 
-# each test assigns @input and @expected which the check methods then checks
+# each test assigns @input and @parse_output which the check methods then checks
 # The check methods have a pust in it (to be left) which is very handy for checking
 # also the output of parser.check can actually be used as the input of transform
 
@@ -29,18 +29,18 @@ class ParserTest < MiniTest::Test
   def check
     is = @parser.parse(@input)
     #puts is.inspect
-    assert_equal @expected , is
+    assert_equal @parse_output , is
   end
   def test_number
     @input    = '42 '
-    @expected = {:integer => '42'}
+    @parse_output = {:integer => '42'}
     @parser = @parser.integer
     check
   end
 
   def test_name
     @input    = 'foo '
-    @expected = {:name => 'foo'}
+    @parse_output = {:name => 'foo'}
     @parser = @parser.name
     check
   end
@@ -49,21 +49,21 @@ class ParserTest < MiniTest::Test
     @input    = <<HERE
 "hello" 
 HERE
-    @expected =  {:string=>"hello"}
+    @parse_output =  {:string=>"hello"}
     @parser = @parser.string
     check
   end
 
   def test_one_argument
     @input    = '(42)'
-    @expected = {:argument_list => {:argument => {:integer => '42'}} }
+    @parse_output = {:argument_list => {:argument => {:integer => '42'}} }
     @parser = @parser.argument_list
     check
   end
 
   def test_argument_list
     @input    = '(42, foo)'
-    @expected = {:argument_list => [{:argument => {:integer => '42'}},
+    @parse_output = {:argument_list => [{:argument => {:integer => '42'}},
                           {:argument => {:name   => 'foo'}}]}
     @parser = @parser.argument_list
     check
@@ -71,7 +71,7 @@ HERE
 
   def test_function_call
     @input = 'baz(42, foo)'
-    @expected = {:function_call => {:name => 'baz' },
+    @parse_output = {:function_call => {:name => 'baz' },
                 :argument_list    => [{:argument => {:integer => '42'}},
                              {:argument => {:name => 'foo'}}]}
 
@@ -83,7 +83,7 @@ HERE
     @input    = <<HERE
     puts( "hello")
 HERE
-    @expected = {:function_call => {:name => 'baz' },
+    @parse_output = {:function_call => {:name => 'baz' },
                 :argument_list    => [{:argument => {:integer => '42'}},
                              {:argument => {:name => 'foo'}}]}
 
@@ -97,7 +97,7 @@ HERE
 5
 else
 HERE
-    @expected = {:expressions=>[{:integer=>"4"}, {:integer=>"5"}]}
+    @parse_output = {:expressions=>[{:integer=>"4"}, {:integer=>"5"}]}
     
     @parser = @parser.expressions_else
     check
@@ -110,7 +110,7 @@ name
 call(4,6)
 end
 HERE
-    @expected = {:expressions => [ { :integer => "5" }, 
+    @parse_output = {:expressions => [ { :integer => "5" }, 
                   { :name => "name" }, 
                   { :function_call => { :name => "call" } , 
                     :argument_list => [ {:argument => { :integer => "4" } } , 
@@ -127,7 +127,7 @@ else
   667
 end
 HERE
-    @expected = { :conditional => { :integer => "0"}, 
+    @parse_output = { :conditional => { :integer => "0"}, 
                   :if_true => {  :expressions => [ { :integer => "42" } ] } , 
                   :if_false => { :expressions => [ { :integer => "667" } ] } }
     @parser = @parser.conditional
@@ -140,7 +140,7 @@ def foo(x)
   5
 end
 HERE
-    @expected = {:function_definition   => {:name => 'foo'},
+    @parse_output = {:function_definition   => {:name => 'foo'},
                 :parmeter_list => {:parmeter => {:name => 'x'}},
                 :expressions   => [{:integer => '5'}]}
     @parser = @parser.function_definition
@@ -153,7 +153,7 @@ def foo(x)
  abba = 5 
 end
 HERE
-    @expected = { :function_definition => { :name => "foo" } , 
+    @parse_output = { :function_definition => { :name => "foo" } , 
                   :parmeter_list => { :parmeter => { :name => "x" } }, 
                   :expressions => [ { :asignee => { :name => "abba" }, :asigned => { :integer => "5" } } ]
                 }
@@ -163,7 +163,7 @@ HERE
 
   def test_assignment
     @input    = "a = 5"
-    @expected = { :asignee => { :name=>"a" } , :asigned => { :integer => "5" } }
+    @parse_output = { :asignee => { :name=>"a" } , :asigned => { :integer => "5" } }
     @parser = @parser.assignment
     check
   end
diff --git a/test/test_transform.rb b/test/test_transform.rb
index a6651d6f..2f5ec275 100644
--- a/test/test_transform.rb
+++ b/test/test_transform.rb
@@ -11,32 +11,31 @@ class TransformTest <  MiniTest::Test
   def check
     is = @transform.apply @input
     #puts is.transform
-    assert_equal @expected , is
+    assert_equal @transform_output , is
   end
   def test_number
     @input    = {:integer => '42'}
-    @expected = Parser::IntegerExpression.new(42)
+    @transform_output = Parser::IntegerExpression.new(42)
     check
-    assert_equal 42 , @expected.value
+    assert_equal 42 , @transform_output.value
   end
 
   def test_name
     @input    = {:name => 'foo'}
-    @expected = Parser::NameExpression.new('foo')
+    @transform_output = Parser::NameExpression.new('foo')
     check
   end
 
   def test_string
     @input    =  {:string=>"hello"}
-    @expected =  Parser::StringExpression.new('hello')
-    @parser = @parser.string
+    @transform_output =  Parser::StringExpression.new('hello')
     check
   end
 
   def test_argument_list
     @input    = {:argument_list => [{:argument => {:integer => '42'}},
                           {:argument => {:name   => 'foo'}}]}
-    @expected = [Parser::IntegerExpression.new(42),
+    @transform_output = [Parser::IntegerExpression.new(42),
                 Parser::NameExpression.new('foo')]
     check
   end
@@ -44,7 +43,7 @@ class TransformTest <  MiniTest::Test
   def test_single_argument
     @input = {:function_call => {:name => 'foo'},
              :argument_list    => {:argument => {:integer => '42'} } }
-    @expected = Parser::FuncallExpression.new 'foo', [Parser::IntegerExpression.new(42)]
+    @transform_output = Parser::FuncallExpression.new 'foo', [Parser::IntegerExpression.new(42)]
 
     check
   end
@@ -53,7 +52,7 @@ class TransformTest <  MiniTest::Test
     @input = {:function_call => {:name => 'baz'},
              :argument_list    => [{:argument => {:integer => '42'}},
                           {:argument => {:name => 'foo'}}]}
-    @expected = Parser::FuncallExpression.new 'baz', [Parser::IntegerExpression.new(42),
+    @transform_output = Parser::FuncallExpression.new 'baz', [Parser::IntegerExpression.new(42),
                                           Parser::NameExpression.new('foo')]
 
     check
@@ -63,7 +62,7 @@ class TransformTest <  MiniTest::Test
     @input = { :conditional => { :integer => "0"}, 
                   :if_true => {  :expressions => [ { :integer => "42" } ] } , 
                   :if_false => { :expressions => [ { :integer => "667" } ] } }
-    @expected = Parser::ConditionalExpression.new(  Parser::IntegerExpression.new(0),
+    @transform_output = Parser::ConditionalExpression.new(  Parser::IntegerExpression.new(0),
                                                 [Parser::IntegerExpression.new(42)],
                                                 [Parser::IntegerExpression.new(667)])
     check
@@ -71,12 +70,12 @@ class TransformTest <  MiniTest::Test
 
   def test_parmeter
     @input = {:parmeter => { :name => "foo"}} 
-    @expected = Parser::NameExpression.new('foo')
+    @transform_output = Parser::NameExpression.new('foo')
     check
   end
   def test_parmeter_list
     @input = {:parmeter_list => [{:parmeter => { :name => "foo"}}]}
-    @expected = [Parser::NameExpression.new('foo')]
+    @transform_output = [Parser::NameExpression.new('foo')]
     check
   end
   
@@ -84,7 +83,7 @@ class TransformTest <  MiniTest::Test
     @input = {:function_definition   => {:name => 'foo'},
                 :parmeter_list => {:parmeter => {:name => 'x'}},
                 :expressions   => [{:integer => '5'}]}
-    @expected = Parser::FunctionExpression.new('foo', 
+    @transform_output = Parser::FunctionExpression.new('foo', 
                 [Parser::NameExpression.new('x')], 
                 [Parser::IntegerExpression.new(5)])
     check
@@ -95,14 +94,14 @@ class TransformTest <  MiniTest::Test
                   :parmeter_list => { :parmeter => { :name => "x" } }, 
                   :expressions => [ { :asignee => { :name => "abba" }, :asigned => { :integer => "5" } } ]
                 }
-    @expected = Parser::FunctionExpression.new( "foo", [Parser::NameExpression.new("x")],
+    @transform_output = Parser::FunctionExpression.new( "foo", [Parser::NameExpression.new("x")],
                            [Parser::AssignmentExpression.new( "abba", Parser::IntegerExpression.new(5) ) ])
     check
   end
 
   def test_assignment
     @input =   { :asignee => { :name=>"a" } , :asigned => { :integer => "5" } }
-    @expected = Parser::AssignmentExpression.new("a", Parser::IntegerExpression.new(5) )
+    @transform_output = Parser::AssignmentExpression.new("a", Parser::IntegerExpression.new(5) )
     check
   end
 end