found bug and more tests

lib/parfait/list.rb

@@ -19,11 +19,13 @@ module Parfait
       internal_object_length - 1
     end
 
+    # index of item, remeber first item has index 1
+    # return  nil if no such item
     def index_of( item )
       max = self.get_length
       counter = 1
       while( counter < max )
-        if( get(index) == item)
+        if( get(counter) == item)
           return counter
         end
         counter = counter + 1
@@ -31,6 +33,11 @@ module Parfait
       return nil
     end
 
+    # include? means non nil index
+    def include? item
+      return index_of(item) != nil
+    end
+
     # push means add to the end
     # this automatically grows the List
     def push value

test/parfait/test_list.rb

@@ -49,4 +49,14 @@ class TestList < MiniTest::Test
       assert_equal v , @list.get(k)
     end
   end
+  def test_index_of
+    test_many_get
+    assert_equal 2 , @list.index_of( :two )
+    assert_equal nil , @list.index_of( :four )
+  end
+  def test_incude
+    test_many_get
+    assert_equal true , @list.include?( :two )
+    assert_equal false , @list.include?( :four )
+  end
 end