Switch to Firefox from PhantomJS

As PhantomJS is no longer maintained and there are packaging problems,
let's switch to using Firefox in a headless configuration which is a
scenario supported by Selenium.

Change-Id: Ic98c5b71202f033b9013c126f6bacdb49980acfa

tests/framework.py

@@ -4,11 +4,11 @@ import unittest
 import os
 import subprocess
 import time
-import xvfbwrapper
 from typing import List
 
 import petname
 from selenium import webdriver
+from selenium.webdriver.firefox.options import Options as FirefoxOptions
 from selenium.webdriver.common.by import By
 
 
@@ -58,9 +58,9 @@ def gui_wrapper(func):
     def wrapper(cls, *args, **kwargs):
 
         # Setup Selenium Driver
-        cls.display = xvfbwrapper.Xvfb(width=1280, height=720)
-        cls.display.start()
-        cls.driver = webdriver.PhantomJS()
+        options = FirefoxOptions()
+        options.add_argument("-headless")
+        cls.driver = webdriver.Firefox(options=options)
 
         # Run function
         try:
@@ -69,7 +69,6 @@ def gui_wrapper(func):
         finally:
             # Tear down driver
             cls.driver.quit()
-            cls.display.stop()
 
     return wrapper
 

tools/basic_setup.sh

@@ -2,11 +2,6 @@
 
 set -ex
 
-#sudo apt update
-
-# Install the X virtual framebuffer, which is required for selenium
-# tests of the horizon dashboard.
-sudo apt install -y xvfb npm libfontconfig1
-phantomjs -v || sudo npm install -g phantomjs-prebuilt
-# Verify that PhantomJS, our selenium web driver, works.
-phantomjs -v
+sudo apt update
+# install Firefox which will be used for Web UI testing in a headless mode.
+sudo apt install -y firefox-geckodriver python3-petname python3-selenium

tools/lxd_build.sh

@@ -5,13 +5,8 @@ set -ex
 export PATH=/snap/bin:$PATH
 
 sudo apt update
-
-# Install the X virtual framebuffer, which is required for selenium
-# tests of the horizon dashboard.
-sudo apt install -y xvfb npm libfontconfig1
-sudo npm install -g phantomjs-prebuilt
-# Verify that PhantomJS, our selenium web driver, works.
-phantomjs -v
+# install Firefox which will be used for Web UI testing in a headless mode.
+sudo apt install -y firefox-geckodriver python3-petname python3-selenium
 
 # Setup snapd and snapcraft
 sudo apt install -y snapd