chore: Run npm build and test scripts for travis.

Author: hastebrot

.travis.yml

@@ -1,6 +1,22 @@
+# use ubuntu linux.
+os: linux
+dist: trusty
+
+# run in container.
+sudo: false
+
+# use nodejs environment.
 language: node_js
-node_js:
-  - "10"
+node_js: "10"
+
+# run npm install.
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
+  - sleep 3
+  - npm install
+
+# run npm build and test scripts.
+script:
+  - npm run build
+  - npm run test