[keycloak-dev] Htmlunit vs PhantomJS vs Chrome

Vaclav Muzikar vmuzikar at redhat.com
Thu Jun 8 03:20:38 EDT 2017

I agree with Marek - I don't think it would do any good for us as the
default browser.
Imho the new headless mode doesn't make a much difference for us - the
Chrome would be working on the same principle as before (through
Moreover, Chrome and ChromeDriver would need to be downloaded/installed
from external sources - yet, this could be perhaps solvable with Maven (at
least ChromeDriver as it's in the Maven repo).

On Wed, Jun 7, 2017 at 9:53 PM, Marek Posolda <mposolda at redhat.com> wrote:

> Just a note, the main reason why htmlUnit web driver is so faster than
> other browsers is, that it is fully embedded in the same JVM like tests.
> There is no additional overhead in the communication with other
> processes. The only exception are the HTTP requests for the
> communication with the tested Keycloak server and adapters.
> On the other hand, the other web driver implementations, including
> phantomJS, are using external process and there is remote selenium
> server with which the webDriver needs to communicate. It means that all
> the webDriver calls including the most simple (like driver.getTitle() )
> need to send additional HTTP request to the remote selenium server under
> the covers. All of this adds an additional overhead.
> I suspect that headless chrome will also use remote selenium, hence I
> don't expect that performance will be much better comparing to
> phantomJS. But maybe I am wrong..
> Marek
> On 07/06/17 12:14, Stian Thorgersen wrote:
> > We've picked Htmlunit as the default browser to run tests with due to it
> > being the fastest. Downside is that it simply doesn't work very well for
> > all tests, especially those heavy on the javascript side of things like
> > testing the JavaScript adapter and admin console.
> >
> > Just saw that Chrome is actually bringing a headless option to Chrome 59
> > [1]. This is really nice as it allows headless testing with a real
> browser,
> > not just an emulated browser.
> >
> > Ideally if this is fast we could use it as the default browser instead of
> > htmlunit. Obviously waiting until it's released on all platforms. If it's
> > not as fast as htmlunit then maybe there is a compromise.
> >
> > The default browser would still be htmlunit. Then individual tests could
> be
> > marked (with an annotation on the class or on the WebDriver field). Those
> > marked would use Chrome in headless mode instead of htmlunit. Obviously
> > -Dbrowser would continue to override the browser in either case.
> >
> > Thoughts? Anyone interested in giving the new headless Chrome option a
> spin
> > and evaluating how fast it is compared to htmlunit?
> >
> > [1] https://developers.google.com/web/updates/2017/04/headless-chrome
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Václav Muzikář
Quality Engineer
Keycloak / Red Hat Single Sign-On
Red Hat Czech s.r.o.

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