Run codeception test with gulp and automatically open report when test fails

gulpfile.js

var gulp = require('gulp');
var notify = require('gulp-notify');
var codecept = require('gulp-codeception');
var changed = require('gulp-changed');
var open = require('gulp-open');
var watch = require('gulp-watch');
var debug = require('gulp-debug');
var _ = require('lodash');

gulp.task('runtest', function() {
    var options = testCodeceptOptions('functional', 'userApiCest');
    gulp.src('codeception.yml')
        .pipe(codecept('./vendor/bin/codecept', options))
        .on('error', function(files) {
            notify.onError(testNotification('fail', 'codeception'));
            gulp.run('autoOpenReport');
        })
        .pipe(notify(testNotification('pass', 'codeception')));
});

function testCodeceptOptions(suite, flags) {
    var flags = flags || '';
    var options = {
        debug: false,
        clear: true,
        testSuite: suite,
        notify: true,
        flags: "--colors " + flags
    };
    return options;
}

function testNotification(status, pluginName, override) {
    var options = {
        sound: false,
        title: (status == 'pass') ? 'Tests Passed' : 'Tests Failed',
        message: (status == 'pass') ? '\n\nAll tests have passed!\n\n' : '\n\nOne or more tests failed...\n\n',
        icon: __dirname + '/node_modules/gulp-' + pluginName + '/assets/test-' + status + '.png'
    };
    options = _.merge(options, override);
    return options;
}

gulp.task('buildCompare', function(){
    gulp.src('tests/_output/*.*')
        .pipe(debug({title: 'buildCompare: '}))
        .pipe(gulp.dest('tests/_output/html'));
});

gulp.task('autoOpenReport', function(){
    gulp.src('tests/_output/*.*')
        .pipe(changed('tests/_output/html'))
        // .pipe(changed('tests/_output/html', {hasChanged: changed.compareLastModifiedTime}))
        .pipe(debug({title: 'autoOpenReport'}))
        .pipe(gulp.dest('tests/_output/html'))
        .pipe(open('<%file.path%>'));
});

gulp.task('watch', function () {
   gulp.watch(['tests/**/*.php', 'app/**/*.php'], ['runtest']);
});

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