CODEWITHSUNDEEP
phpsymfonyphpunit
Alexandre Mélard
Alexandre Mélard

Reputation: 12659

phpunit assertNull gets zend_mm_heap corrupted

When using scalar:

$null = null;
$this->assertNull($null);

Test OK

$null = 'not null';
$this->assertNull($null);

Test Fail

When using Object:

$this->assertEquals(null, $menu->getChild('Projects'));

Test OK or Fail regarding if $menu->getChild('Projects') is null or not

$this->assertNull($menu->getChild('Projects'));

Hangs and I get the error: zend_mm_heap corrupted

When using AssertNull, I do not get the same behavior as AssertEquals(null, $var); For the moment, I ban the use of AssertNull, but I was wondering if one of you could explain what's going on...

Upvotes: 3

Views: 1008

Answers (1)

Alexandre Mélard
Alexandre Mélard

Reputation: 12659

The object is of type : Knp\Menu\MenuItem (An object from the knpmenu php library)

The problem is a recursivity problem linked with a function from the phpunit library.

class: PHPUnit/Util/Type

function: recursiveExport

preg_match_all('/\n            \[(\w+)\] => Array\s+\*RECURSION\*/', print_r($value, TRUE), $matches);

$value content

As you see, the child has a reference to the parent object, that is the reason for the deadlock.

But when I read the documentation of print_r, it is stated:

Prior to PHP 4.0.4, print_r() will continue forever if given an array or object that contains a direct or indirect reference to itself. An example is print_r($GLOBALS) because $GLOBALS is itself a global variable that contains a reference to itself.

I'm using :

PHPUnit 3.7.10 by Sebastian Bergmann.

PHP 5.4.7 (cli) (built: Sep 12 2012 23:48:31)

My conclusion for the moment, is NOT to use assertNull but AssertEquals

Upvotes: 2

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