gulp and karma, file karma.conf.js does not exist - gulp

Question

I have a basic AngularJS app and want to have all my terminal command run with gulp tasks eg $ gulp dev for the development server and $ gulp unitTest for testing etc.
I have installed Gulp as per the Docs using $ npm install --save-dev gulp with my gulpfile.js in the root of the project file. I have also done the same for karma's install and config file.
It is worth stating now that I want all the npm installs tagged with --save for easily move the project around the office and servers.
When it comes to adding the task to Gulp I have to us a relative (to the karma module) path for the configFile option to find the config but then It does not find the tests.
the following gulpfile.js produces the error ERROR [config]: File karma.conf.js does not exist!
var gulp = require('gulp'),
// ....
karma = require('karma').Server;
gulp.task('test', function(done) {
var karmaServerOptions = {
configFile: 'karma.conf.js', // works if relative path from ./node_modules/karma/lib/config.js
singleRun: true
};
karma.start(
karmaServerOptions,
function(exitStatus) {
done(exitStatus ? 'There are failing tests' : undefined);
}
);
});
karma.conf.js:
// Karma configuration
// Generated on Thu Aug 06 2015 13:38:12 GMT+0100 (BST)
module.exports = function(config) {
config.set({
// base path that will be used to resolve all patterns (eg. files, exclude)
basePath: './',
// frameworks to use
// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
frameworks: ['jasmine'],
// list of files / patterns to load in the browser
files: [
// '**/*js',
'node_modules/angular/angular.js',
'app/**/*.js',
// 'unitTests/**/*Spec.js',
// 'unitTests/**/*spec.js'
'unitTests/**/*.js'
],
// list of files to exclude
exclude: [],
// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
preprocessors: {},
// test results reporter to use
// possible values: 'dots', 'progress'
// available reporters: https://npmjs.org/browse/keyword/karma-reporter
reporters: ['progress'],
// web server port
port: 9876,
// enable / disable colors in the output (reporters and logs)
colors: true,
// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,
// enable / disable watching file and executing tests whenever any file changes
autoWatch: true,
// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: ['Chrome'],
// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: false
})
}
note: The files array is a bit of a mess as it still has some, but not all, of my experiments in it.

Answer 1

See gulp task can't find karma.conf.js for an explantation about __dirname.
Or use:
var Server = require('karma').Server
gulp.task('test', function (done) {
new Server({
configFile: require('path').resolve('karma.conf.js'),
singleRun: true
}, done).start();
});