mb_strpos(): Empty delimiter

[maveius]

Error:

PHPUnit 6.0.7 by Sebastian Bergmann and contributors.


mb_strpos(): Empty delimiter
.../vendor/phpunit/phpunit/src/Framework/Constraint/StringContains.php:58 // this line added manualy because error handler catch this and after run debug mode then show line number and correct class
.../vendor/symfony/phpunit-bridge/DeprecationErrorHandler.php:73
.../tests/AppBundle/Controller/LoginControllerTest.php:25
 


Time: 108 ms, Memory: 14.00MB


ERRORS!
Tests: 1, Assertions: 2, Errors: 1.

Process finished with exit code 2

My example test:

public function testIndex()
    {
        $client = static::createClient();

        $crawler = $client->request('GET', '/');

        static::assertEquals(200, $client->getResponse()->getStatusCode());
        static::assertContains('', $crawler->filter('body')->text());
    }

I think assertContains should return true if expected (needle) value is the same as (haystack) or if some one check if empty string contains another empty string.

Visualized problem:

static::assertContains('', '');

or if someone would like to use assertContains for comparing two empty strings, maybe library inform that is not good way - I don't now. Like "assertContains is not for comparing to empty strings!... Please use assertEquals"? - I don't now. I'm not a specialist in XUnit philosophy. Now I fix this by change my testcase. But it is temporary solution.

[sebastianbergmann]

Thank you for your report.

Please provide a minimal, self-contained, reproducing test case that shows the problem you are reporting.

Without such a minimal, self-contained, reproducing test case I will not be able to investigate this issue.