php - why error_log generate a RuntimeException only with phpunit's --process-isolation -

i had few tests code being tested outputed error_log information (since i'm testing failures well, expected)

e.g.

<?php class x {     function dosomething(){             error_log('did it');             return true;     } } 

and test:

<?php require_once 'x.php'; class xtest extends phpunit_framework_testcase {     public function testdo(){             $x = new x();             $this->asserttrue( $x->dosomething(), 'dosomething returns true');     } } 

which when run on php_unit without --process-isolation gives me nice . , whatever i'm testing pass.

however, when run with --process-isolation get:

1) test::a data set #1 'a' runtimeexception: did 

why happening? i'm stuck on version 3.4.12 (can't it) didn't find interesting in changelog that.

here's sample session:

xxx$ phpunit xtest.php phpunit 3.4.12 sebastian bergmann.  did .  time: 0 seconds, memory: 4.50mb  ok (1 test, 1 assertion)  shell return code: 0 xxx$ phpunit --process-isolation xtest.php phpunit 3.4.12 sebastian bergmann.  e  time: 0 seconds, memory: 4.50mb  there 1 error:  1) xtest::testdo runtimeexception: did   failures! tests: 1, assertions: 0, errors: 1.  shell return code: 2 

edit: searching "phpunit runtimeexception error_log" , 5sec after submiting it's top search result :( there's nothing out there.

but came here edit , this: adding $this->setexpectedexception('runtimeexception'); absolutely nothing catch this. same outcome happens.

my guess there difference between error_log configuration in outer , inner process. default when running error_log() cli written stderr , cause test failure. need work out why there difference. guess have code runs in outer process changes configuration not getting run on inner.