fix html diff (#334)

Author: andiwand

test/scripts/compare_output_server.py

@@ -31,6 +31,9 @@ def __init__(self, path):
                 self._path = path
 
             def dispatch(self, event):
+                if event.event_type in ['opened']:
+                    return
+
                 if os.path.isfile(event.src_path):
                     Config.comparator.submit(
                         os.path.relpath(event.src_path, self._path))

test/scripts/html_render_diff.py

@@ -29,12 +29,11 @@ def get_browser(driver='firefox', max_width=1000, max_height=10000):
         browser = webdriver.PhantomJS()
     elif driver == 'firefox':
         options = webdriver.FirefoxOptions()
-        options.headless = True
-        browser = webdriver.Firefox(options=options,
-                                    service_log_path=os.path.devnull)
+        options.add_argument("--headless")
+        browser = webdriver.Firefox(options=options)
     else:  # chrome or unknown
         options = webdriver.ChromeOptions()
-        options.headless = True
+        options.add_argument("--headless=new")
         browser = webdriver.Chrome(options=options)
     browser.set_window_size(max_width, max_height)
     return browser