How run phpunit test after change file with Node+Gulp

phpunit_watch_node_gulp

var gulp = require('gulp'),  
    util = require('util'),
    exec = require('child_process').exec;

gulp.task('phpunit', function() {
    exec('phpunit -c my_project_name/App', function(error, stdout) {
        util.puts(stdout); 
    });
}); 

gulp.task('default',['phpunit'], function() {
    gulp.watch([
                'my_project_name/src/AppBundle/*/*.php',
                'my_project_name/src/*.php',
                'my_project_name/src/*.xml',
                'my_project_name/src/*.yml',
                '!my_project_name/app/bin/*/**'
                ], ['phpunit']);
});