[Bug|Unexpected] Shows 2 windows with '--show' flag and client's `useIframe` about karma-electron HOT 4 CLOSED

This is expected behavior. When we shut off useIframe, Karma moves to using window.open instead so there are 2 windows:

• Karma's test harness (communicates to Node.js, starts new test runs)
• Karma's test runner (loads testing framework/test files, communicates success/fail information to test harness via window.parent)

To demonstrate this point further, we could disable useIframe in other browsers and see the same result (e.g. Chrome, Firefox)

from karma-electron.

The thing is that without useIframe: false we lose nodeIntegration, but with it, it shows 2 windows, with the second being incredibly annoying poping up all the time.

I guess the idea is to run with --show flag off and only show when we need to debug the tests, right?

from karma-electron.

Yep, typically showing the window isn't too helpful as content is often added/remove quicker than we can see. To make it less painful to add/remove the --show flag in karma.conf.js, I use the following setup:

Add ElectronVisible browser but don't set it as default browser:

    browsers: ['Electron'],
    customLaunchers: {
      ElectronVisible: {
        base: 'Electron',
        flags: ['--show']
      }
    }

Override default browsers via CLI:

karma start --browsers ElectronVisible
# or for `npm-scripts`
npm run test-karma -- --browsers ElectronVisible

from karma-electron.

Nice 😄

from karma-electron.