[tests] setup selenium for travis ci

tests/testapp/tests/test_live_filters.py

@@ -4,6 +4,7 @@ from django.contrib.auth.models import User
 from django.urls import reverse
 from django.contrib.staticfiles.testing import StaticLiveServerTestCase
 from selenium.webdriver.firefox.webdriver import WebDriver
+from selenium.webdriver.firefox.options import Options
 
 from ..management.commands.createtestdata import create_test_data
 
@@ -12,7 +13,10 @@ class LiveFilterTest(StaticLiveServerTestCase):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
-        cls.selenium = WebDriver()
+
+        options = Options()
+        options.headless = True
+        cls.selenium = WebDriver(options=options)
         cls.selenium.implicitly_wait(10)
 
     @classmethod