Update tests

Author: ahangarha

test/generators/es6_component_generator_test.rb

@@ -17,20 +17,20 @@ def filename
     end
   end
 
-  def class_name
+  def component_name
     'GeneratedComponent'
   end
 
   test 'uses es6 syntax' do
     run_generator %w(GeneratedComponent name --es6)
 
-    assert_file filename, /^class\s#{class_name}\sextends\sReact\.Component/
+    assert_file filename, /^function\s#{component_name}\(\) {/
   end
 
-  test 'assigns defaultProps after class definintion' do
+  test 'assigns defaultProps after function definintion' do
     run_generator %w(GeneratedComponent name --es6)
 
-    assert_file filename, /\s^#{class_name}\.propTypes/
+    assert_file filename, /\s^#{component_name}\.propTypes/
   end
 
   test 'generates working jsx' do