Proposal for a stability fix for the PhantomJS driver

[halfer]

I'm using Spiderling and PHPUnit Spiderling to offer a library that spins up an arbitrary number of web servers for the purposes of component/functional testing. I use a PHPUnit listener to spin up these servers based on custom namespace/classname matches, so that servers are only started when they are needed.

I think it is as a result of using process forking that means that when PhantomJS starts inside Spiderling, it instantiates a number of instances of the class even though they point to the same executable instance. This works fine when running and testing, but it means the destructor is run more than once.

The destructor tries to send a stop() to the instance, but only one of these will succeed. Since we're just in closing down mode, I propose that we trap the failure exception and let it fail silently, so any other test close-down happens in an orderly manner.

The code is presently:

    if ($this->_connection AND $this->_connection->is_started())
    {
        $this->_connection->stop();
    }

I have solved this here, what do you think? If you like this approach, and think it would work for the driver generally, I'd be happy to move this try-catch approach upstream to you, via a PR.

[hkdobrev]

@halfer pull request about this would be appreciated! Thanks!

[halfer]

Alright, I will see what I can do!