basePath does not work properly in some circumstances

[ghost]

I am running karma using gulp. This is a gulp task module I require:

var karma = require("karma");

module.exports = function (done) {
    new karma.Server({
        configFile: '../../../karma.conf.js',
        singleRun: true
    }, function (exitCode) {
        done();
    }).start();
};

The module file is on path root/tasks/test/karma.js. I have a root/karma.conf.js as you can see... It contains this:

module.exports = function (config) {
    config.set({
        basePath: __dirname,
        frameworks: ['jasmine'],
        files: [
            {pattern: 'src/nodelist.js', included: true},
            {pattern: 'tests/*.js', included: true}
        ],
        exclude: [],
        reporters: ['progress'],
        port: 9876,
        colors: true,
        logLevel: config.LOG_INFO,
        autoWatch: true,
        browsers: ['Firefox'],
        captureTimeout: 6000,
        singleRun: false
    });
};

It works now properly, but when I try to use basePath: "root", then it sets the basePath to root/../../../ which I think is because the configFile: '../../../karma.conf.js', part of the gulp task. I use win7 x64. Any idea why this happens?

[devoto13]

I would say it is a bug in Karma, which we should fix. This will be a breaking change though.

What happens is that Karma resolves the relative basePath relative to the configuration file directory (http://karma-runner.github.io/6.3/config/configuration-file.html#basepath). The directory of the configuration file is ../../../, hence the basePath is resolved to root/../../... This part works as intended.

The bug is that when using Karma programmatically the configuration file path is resolved relative to the node_modules/karma/lib instead of CWD, hence you have to set it as ../../../karma.conf.js instead of ./karma.conf.js. So we should change this part, which will, in turn, resolve the problem with basePath.