Gulpfile.js

'use strict';
var gulp = require('gulp');
var jshint = require('gulp-jshint');
var istanbul = require('gulp-istanbul');
var mocha = require('gulp-mocha');
var runSequence = require('run-sequence');

var globs = {
  js: {
    lib: ['lib/**/*.js', 'start.js'],
    gulpfile: ['Gulpfile.js'],
    specs: ['tests/**/*.js']
  },
  specs: ['tests/**/*.js', '!tests/fixtures/**']
};

function runJshint() {
  return gulp.src(
      globs.js.lib.concat(
        globs.js.gulpfile,
        globs.js.specs)
    )
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'))
    .pipe(jshint.reporter('jshint-growl-reporter'));
}

function mochaServer(options) {

  return gulp.src(globs.specs, {
      read: false
    })
    .pipe(mocha(options || {
      reporter: 'nyan',
      growl: true
    }));
}
// Testing
var coverageOptions = {
  dir: './coverage',
  reporters: ['html', 'lcov', 'text-summary', 'html', 'json'],
  reportOpts: {
    dir: './coverage'
  }
};

gulp.task('jshint-build', function () {
  return runJshint().pipe(jshint.reporter('fail'));
});
gulp.task('jshint', function () {
  return runJshint();
});

var coverageThresholds = {
  thresholds: {
    statements: 80,
    branches: 80,
    lines: 80,
    functions: 80
  },
  coverageDirectory: 'coverage',
  rootDirectory: process.cwd()
};
gulp.task('pre-test', function () {
  return gulp.src(globs.js.lib)
    .pipe(istanbul())
    .pipe(istanbul.hookRequire());
});
gulp.task('mocha-server', ['pre-test'], function () {

  mochaServer({
      reporter: 'spec'
    })
    .pipe(istanbul.writeReports(coverageOptions))
    .pipe(istanbul.enforceThresholds(coverageThresholds));

});

gulp.task('watch', function () {

  var watching = false;
  gulp.start(
    'jshint',
    'mocha-server',
    function () {
      // Protect against this function being called twice
      if (!watching) {
        watching = true;
        gulp.watch(globs.js.lib.concat(
          globs.js.specs), ['seq-test']);
        gulp.watch(globs.js.Gulpfile, ['jshint']);
      }
    });
});
gulp.task('seq-test', function () {
  runSequence('jshint', 'mocha-server');
});
gulp.task('test', function () {
  return gulp.start('jshint-build',
    'mocha-server');
});
gulp.task('build', function () {
  return gulp.start('jshint-build',
    'mocha-server');
});
gulp.task('default', function () {
  return gulp.start('jshint-build',
    'mocha-server');
});