Hmm... I'm not sure why this is still failing.

But this is OK: https://phpstan.org/r/d3b13b8f-d91a-4384-81a3-0cc4e81ef2c3

@ondrejmirtes Perhaps you have an idea of what's going on?

Please check out what type each expression has:

$client = static::createClient();
$client === 'aaa';
$client->getResponse() === 'aaa';

A rule starting with Strict comparison between ... will tell you what the type is. There's no magic, PHPStan just reads native typehints and phpDocs, so you can figure that out.

Okay, so the problem seems to me like symfony/framework-bundle 4.2 is not forward compatible with symfony/http-kernel 4.3 😞

Will be fixed by symfony/symfony#32213

In the meantime, we can already remove these ignored errors on master.

Obsoleted by #2925