Added headlessness from here https://medium.com/@joyzoursky/recent-updates-6264d1e5d42f

ojusomap/tests.py

@@ -24,6 +24,8 @@ class SeleniumTest(LiveServerTestCase):
     def setUpClass(cls):
         chrome_options = webdriver.ChromeOptions()
         chrome_options.add_argument('--no-sandbox')
+        chrome_options.add_argument('--headless')
+        chrome_options.add_argument('--disable-gpu')
         cls.sl = webdriver.Chrome(chrome_options=chrome_options)
      #   profile = webdriver.FirefoxProfile()
      #   profile.set_preference("dom.forms.number", False)