diff --git a/.travis.yml b/.travis.yml
index c5e0d07..77b6bbd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,9 +7,14 @@ php:
 
 before_script:
   - composer install -n
+  - npm install -g mocha
+  - cd js
+  - npm install jsverify jsdom jsdom-global
+  - cd ..
 
 script:
   - cd tst && phpunit
+  - cd ../js && mocha
 
 after_script:
   - cd ..