Error PHPUnit on assertXpath/assertQuery

assertQuery

 ..PHP Fatal error:  Uncaught exception 'UnexpectedValueException' with message 'Error at offset 9013 of 38834 bytes' in /usr/share/php/PHPUnit/Util/PHP.php:186
Stack trace:
#0 /usr/share/php/PHPUnit/Util/PHP.php(186): unserialize('a:4:{s:10:"test...')
#1 /usr/share/php/PHPUnit/Util/PHP.php(161): PHPUnit_Util_PHP::processChildResult(Object(JobsControllerTest), Object(PHPUnit_Framework_TestResult), 'a:4:{s:10:"test...', '')
#2 /usr/share/php/PHPUnit/Framework/TestCase.php(605): PHPUnit_Util_PHP::runJob('<?php?set_inclu...', Object(JobsControllerTest), Object(PHPUnit_Framework_TestResult))
#3 /usr/share/php/PHPUnit/Framework/TestSuite.php(751): PHPUnit_Framework_TestCase->run(Object(PHPUnit_Framework_TestResult))
#4 /usr/share/php/PHPUnit/Framework/TestSuite.php(727): PHPUnit_Framework_TestSuite->runTest(Object(JobsControllerTest), Object(PHPUnit_Framework_TestResult))
#5 /usr/share/php/PHPUnit/Framework/TestSuite.php(687): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), false, Array, Array, true)
#6 /usr/sha in /usr/share/php/PHPUnit/Util/PHP.php on line 186
Falha de segmentação

#code tested
$this->assertXpath("//form//input[@type='text' and @name='job[title]']");