test before building in docker (#2491)

Dockerfile

@@ -14,4 +14,6 @@ RUN apt-get install -yq gconf-service libasound2 libatk1.0-0 libc6 libcairo2 lib
   libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 \
   ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget
 
+RUN npm run test:all
+
 CMD ["npm", "run", "build"]