Make the file upload test a little bit less fragile

Author: matthiask

ckeditor_demo/demo_application/tests.py

@@ -71,15 +71,15 @@ def _open_image_upload_widget(self):
         sleep(1)
 
     def _go_to_upload_tab(self):
-        self.selenium.find_element_by_id("cke_Upload_123").click()
+        self.selenium.find_element_by_css_selector("a[title='Upload']").click()
         sleep(1)
 
     def _switch_to_form_iframe(self):
-        iframe = self.selenium.find_element_by_id('cke_118_fileInput')
+        iframe = self.selenium.find_element_by_css_selector('iframe.cke_dialog_ui_input_file')
         self.selenium.switch_to.frame(iframe)
 
     def _upload_image(self):
-        input = self.selenium.find_element_by_id("cke_118_fileInput_input")
+        input = self.selenium.find_element_by_css_selector("input[type=file]")
         input.send_keys(self._get_upload_file())
         self.selenium.switch_to.default_content()
         self.selenium.find_element_by_class_name("cke_dialog_ui_fileButton").click()