Permissions error with "//proc/tty/driver" in PHPUnit and Jenkins?

I am attempting to run a build on Jenkins running Ubuntu 14.04. My PHPUnit is crashing with the below error message, but there doesn't seem to much out there regarding this error. My xdebug appears to be loading correctly. I am running PHPUnit v4.8.10.

When I try to run phpunit via the command line directly, it just hangs and doesn't return. What am I missing?

 phpunit: 
 [phpunit] PHP Fatal error:  Uncaught exception 'UnexpectedValueException' with message 'RecursiveDirectoryIterator::__construct(//proc/tty/driver): failed to open dir: Permission denied' in /var/lib/jenkins/jobs/Some other job/workspace/vendor/phpunit/php-file-iterator/src/Factory.php:66
 [phpunit] Stack trace:
 [phpunit] #0 [internal function]: RecursiveDirectoryIterator->__construct('//proc/tty/driv...', 512)
 [phpunit] #1 [internal function]: RecursiveDirectoryIterator->getChildren()
 [phpunit] #2 [internal function]: FilterIterator->rewind()
 [phpunit] #3 /var/lib/jenkins/jobs/Some other job/workspace/vendor/phpunit/php-file-iterator/src/Factory.php(66): AppendIterator->append(Object(File_Iterator))
 [phpunit] #4 /var/lib/jenkins/jobs/Some other job/workspace/vendor/phpunit/php-file-iterator/src/Facade.php(38): File_Iterator_Factory->getFileIterator(Array, '.php', '', Array)
 [phpunit] #5 /var/lib/jenkins/jobs/Some other job/workspace/vendor/phpunit/php-code-coverage/src/CodeCoverage/Filter.php(112): File_Iterator_Facade->getFilesAsArray('/', '.php', '')
 [phpunit] #6 /var/lib/jenkins/jobs/Some other job/workspace/vend in /var/lib/jenkins/jobs/Some other job/workspace/vendor/phpunit/php-file-iterator/src/Factory.php on line 66

 BUILD FAILED
 /var/lib/jenkins/jobs/Some other job/workspace/build.xml:169: exec returned: 255

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