.gitignore

# Logs
logs
*.log

# Runtime data
pids
*.pid
*.seed

# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov

# Coverage directory used by tools like istanbul
coverage

# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt

# node-waf configuration
.lock-wscript

# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release

# Dependency directory
# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
node_modules

gulpfile.js

var gulp = require('gulp');
var mocha = require('gulp-mocha');

var paths = {
  tests: ['*.js', 'test/*.js']
};

gulp.task('tests', function(){
  return gulp.src(paths.tests, {read:false})
    .pipe(mocha());
});

gulp.task('watch', function(){
  return gulp.watch(paths.tests, ['tests']);
});

gulp.task('default', ['watch']);

package.json

{
  "name": "no_terminate",
  "version": "0.0.1",
  "description": "gulp-mocha not terminate",
  "main": "server.js",
  "scripts": {
    "test": "mocha"
  },
  "author": "JuanpabloAJ",
  "license": "MIT",
  "dependencies": {
    "express": "^4.10.6"
  },
  "scripts": {
    "postinstall": "mkdir -p test"
  },
  "devDependencies": {
    "gulp": "^3.8.10",
    "gulp-mocha": "^2.0.0",
    "mocha": "^2.1.0",
    "should": "^4.4.2",
    "supertest": "^0.15.0"
  }
}

server.js

var express = require('express');
var app = express();
module.exports.app = app;

var port = process.env.PORT || 8080;

var router = express.Router();

router.get('/', function(req, res){
  res.json({ message: 'to test with gulp-mocha'});
});

app.use('/', router);

app.listen(port);

test_app.js

var request = require('supertest');
var app = require('./server').app;
var should = require('should');

describe('app test', function(){
  it('app return json message', function(done){
    request(app)
      .get('/')
      .expect(200)
      .end(function(err, res){
        res.body.message.should.match(/test/);
        done();
      });
  });
});