Another attempt at headless testing with Travis CI.

Try to replace Sauce Labs, so CI works for pull requests (#774).

Based on configuration at 60c73499fc/README.md.

.travis.yml

@@ -1,13 +1,19 @@
 language: generic
 dist: xenial
+services:
+  - xvfb
 addons:
-  sauce_connect: true
+  firefox: latest
 before_install:
-  - sudo apt-get install -y python3-pillow python3-numpy python3-pip
+  - sudo apt-get install -y python3-pillow python3-numpy python3-pip mesa-utils libgl1-mesa-dri libglapi-mesa libosmesa6
   - sudo pip3 install selenium
+install:
+  - wget https://github.com/mozilla/geckodriver/releases/download/v0.24.0/geckodriver-v0.24.0-linux64.tar.gz
+  - tar -xf geckodriver-v0.24.0-linux64.tar.gz
+  - sudo mv geckodriver /usr/local/bin
 jobs:
   include:
     - stage: build
       script: python3 utils/build/build.py
     - stage: test
-      script: python3 tests/run_tests.py
+      script: xvfb-run -a python3 tests/run_tests.py

tests/run_tests.py

@@ -33,24 +33,10 @@ thread.start()
 
 # Create a new instance of the Firefox driver
 print("Starting web driver...")
-if os.environ.get("TRAVIS_JOB_NUMBER"):
-    # Configuration for Travis CI / Sauce Labs testing
-    driver = webdriver.Remote(
-        command_executor="https://ondemand.saucelabs.com:443/wd/hub",
-        desired_capabilities={
-            "username": os.environ["SAUCE_USERNAME"],
-            "accessKey": os.environ["SAUCE_ACCESS_KEY"],
-            "tunnel-identifier": os.environ["TRAVIS_JOB_NUMBER"],
-            "build": os.environ["TRAVIS_JOB_NUMBER"],
-            "browserName": "firefox",
-            "seleniumVersion": "3.141.0",
-        },
-    )
-else:
-    fp = webdriver.FirefoxProfile()
-    fp.set_preference("layout.css.devPixelsPerPx", "1.0")
-    driver = webdriver.Firefox(firefox_profile=fp)
-    driver.set_window_size(800, 600)
+fp = webdriver.FirefoxProfile()
+fp.set_preference("layout.css.devPixelsPerPx", "1.0")
+driver = webdriver.Firefox(firefox_profile=fp)
+driver.set_window_size(800, 600)
 
 
 def run_tests():