let travis check if npm package is not broken

.travis.yml

@@ -14,4 +14,5 @@ after_script:
   - npm run-script build
   - npm run-script karma
   - npm run-script test-coveralls
+  - cd test/node && npm install && node app.js
 

test/node/app.js

@@ -0,0 +1,5 @@
+var web3 = require('ethereum.js');
+
+console.log(web3.version.api);
+
+

test/node/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "node",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "ethereum.js": "ethereum/ethereum.js#master"
+  }
+}