Remove xvfb for saucelabs. Use wct instead of polymer-cli

Author: web-padawan

.travis.yml

@@ -18,15 +18,15 @@ install:
 before_script:
   - gulp lint version:check
   - polymer lint --rules polymer-2 --input *.html
-  - xvfb-run -s '-screen 0 1024x768x24' polymer test
+  - xvfb-run -s '-screen 0 1024x768x24' wct
 
 script:
   - if [[ "$TRAVIS_EVENT_TYPE" != "pull_request" && "$TRAVIS_BRANCH" != quick/* ]]; then
       npm i --no-save gemini@^4.0.0 gemini-sauce gemini-polyserve &&
       gemini test test/visual &&
       gemini test test/visual -c .gemini-ie.yml &&
-      xvfb-run -s '-screen 0 1024x768x24' polymer test --env saucelabs;
+      wct --env saucelabs;
     fi
   - if [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then
-      xvfb-run -s '-screen 0 1024x768x24' polymer test --env saucelabs-cron;
+      wct --env saucelabs-cron;
     fi