travis-ci karma singleRun

Question

On my local machine I want npm test to watch files and re-test on change, so I use singleRun: false in karma.conf.js .

On travis-ci this causes a timeout error. How do I override the singleRun option for travis-ci environment only?

Answer 1

Given that the cli can also be used to enable/disable singleRun, adding "--no-single-run" to the karma cli run might override the config file...

Alternately, given the karma.conf.js is a Javascript file, can you write the setting of singleRun as a function (eg which detects one of the Travis environment variables) and spit out "false" or "true" appropriately?

Answer 2

I use the following solution (inspired by @palfrey). Travis runs will have CI=true set as an environment variable.

Use node's process.env function to set a local var to the value of CI (or false if unset), then use this as the value for singleRun in the config:

karma.conf.js

const ci = process.env.CI || false

module.exports = function(config) {
  config.set({
    singleRun: ci,
    ...
 }
}