Travis give error but compiles on pc - node.js

Question

I'm making a web server with Node.JS and use Travis-Ci to check my code. Yhe problem I got is when I commit my code, Travis gives error below, but the code compiles without an error on my pc:
./backend/server.js: 1: Syntax error: ( unexpected
Here you could find my .travis.yml file:
install:
- npm install
- npm install -g bower
- bower install bootstrap
- bower install socket.io
language: node_js
node_js:
- "6.9"
before_script:
- chmod 0777 ./backend/server.js
cache:
directories:
- node_modules
- bower_components
and the package.json
{
"name": "watchfriends",
"version": "0.0.0",
"description": "Front-end and back-end project watchfriends",
"main": "gulpfile.js",
"scripts": {
"test": "./backend/server.js"
},
"repository": {
"type": "git",
"url": "git+https://github.com/WatchFriends/Backend.git"
},
"author": "Hein P., Jasper D., Michiel V., Michiel Z.",
"license": "ISC",
"bugs": {
"url": "https://github.com/WatchFriends/Backend/issues"
},
"homepage": "https://github.com/WatchFriends/Backend#readme",
"devDependencies": {
"gulp": "^3.9.1",
"gulp-autoprefixer": "^3.1.1",
"gulp-clean-css": "^2.0.13",
"gulp-concat": "^2.6.1",
"gulp-csslint": "^1.0.0",
"gulp-htmlhint": "^0.3.1",
"gulp-jshint": "^2.0.4",
"gulp-notify": "^2.2.0",
"gulp-sass": "^2.3.2",
"gulp-sourcemaps": "^2.2.0",
"gulp-uglify": "^2.0.0",
"jshint-stylish": "^2.2.1"
},
"dependencies": {
"socket.io": "^1.5.1"
}
}
On this gist, you could find my code, including the log.
Did I something wrong?
Thanks in advance.

Answer 1

Travis runs npm test when testing your code.
If you check inside of your "package.json" file then you can see that the test script is set to run ./backend/server.js. You need to run the node file with node.
Change that to node ./backend/server.js and hopefully that'll work.