Fix typo in page_dump_helper.rb

actionpack/lib/action_dispatch/testing/test_helpers/page_dump_helper.rb

@@ -7,12 +7,12 @@ module ActionDispatch
 
       # Saves the content of response body to a file and tries to open it in your browser.
       # Launchy must be present in your Gemfile for the page to open automatically.
-      def save_and_open_page(path = html_dump_defaul_path)
+      def save_and_open_page(path = html_dump_default_path)
         save_page(path).tap { |s_path| open_file(s_path) }
       end
 
       private
-        def save_page(path = html_dump_defaul_path)
+        def save_page(path = html_dump_default_path)
           raise InvalidResponse.new("Response is a redirection!") if response.redirection?
           path = Pathname.new(path)
           path.dirname.mkpath
@@ -27,7 +27,7 @@ module ActionDispatch
           warn "File saved to #{path}.\nPlease install the launchy gem to open the file automatically."
         end
 
-        def html_dump_defaul_path
+        def html_dump_default_path
           Rails.root.join("tmp/html_dump", "#{method_name}_#{DateTime.current.to_i}.html").to_s
         end
     end