normalize arg for ActionView::TestCase tests method

actionpack/lib/action_view/test_case.rb

@@ -50,7 +50,12 @@ module ActionView
 
       module ClassMethods
         def tests(helper_class)
-          self.helper_class = helper_class
+          case helper_class
+          when String, Symbol
+            self.helper_class = "#{helper_class.to_s.underscore}_helper".camelize.safe_constantize
+          when Module
+            self.helper_class = helper_class
+          end
         end
 
         def determine_default_helper_class(name)

actionpack/test/template/test_test.rb

@@ -62,3 +62,19 @@ class CrazyHelperTest < ActionView::TestCase
     assert_equal PeopleHelper, self.class.helper_class
   end
 end
+
+class CrazySymbolHelperTest < ActionView::TestCase
+  tests :people
+
+  def test_set_helper_class_using_symbol
+    assert_equal PeopleHelper, self.class.helper_class
+  end
+end
+
+class CrazyStringHelperTest < ActionView::TestCase
+  tests 'people'
+
+  def test_set_helper_class_using_string
+    assert_equal PeopleHelper, self.class.helper_class
+  end
+end