gulpfile.js

var gulp = require('gulp');
var mocha = require('gulp-mocha');
var gutil = require('gulp-util');
var eslint = require('gulp-eslint');

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* RUN TESTS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

gulp.task('lint', function() {
  return gulp.src(['**/*.js','!node_modules/**'])
    // eslint() attaches the lint output to the "eslint" property
    // of the file object so it can be used by other modules.
    .pipe(eslint())
    // eslint.format() outputs the lint results to the console.
    // Alternatively use eslint.formatEach() (see Docs).
    .pipe(eslint.format());
});

gulp.task('test', function() {
  return gulp.src(['test/*.js'], { read: false })
    .pipe(mocha({ reporter: 'list' }))
    .on('error', gutil.log);
});

gulp.task('test-watch', function() {
  gulp.watch(['./**/*.js'], ['test']);
});