gulpfile.js

'use strict';
var path = require('path');
var gulp = require('gulp');
var mocha = require('gulp-mocha');
var istanbul = require('gulp-istanbul');
var plumber = require('gulp-plumber');
var coveralls = require('gulp-coveralls');

gulp.task('pre-test', function () {
  return gulp.src(['lib/*.js'])
      .pipe(istanbul({includeUntested: true}))
      .pipe(istanbul.hookRequire());
});

gulp.task('test', ['pre-test'], function (cb) {
  var mochaErr;

  gulp.src('tests/*.js')
    .pipe(plumber())
    .pipe(mocha({reporter: 'spec'}))
    .on('error', function (err) {
      mochaErr = err;
      console.log(err);
    })
    .pipe(istanbul.writeReports())
    .on('end', function () {
      cb(mochaErr);
    });
});

gulp.task('coveralls', ['test'], function () {
  return gulp.src(path.join(__dirname, 'coverage/lcov.info'))
    .pipe(coveralls());
});

gulp.task('default', ['test', 'coveralls']);