Fatal error in functional tests when server returns 404

athena% PHPBB_FUNCTIONAL_URL=http://localhost/ php -d suhosin.executor.include.whitelist="phar" -d include_path=.:/home/pie/apps/git-phpunit-bundle ~pie/apps/git-phpunit-bundle/phpunit.php   -v --group functional -c phpunit.xml.functional

Warning: file_get_contents(http://localhost/install/index.php?mode=install&sub=install): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

 in /home/pie/apps/phpbb/tests/test_framework/phpbb_functional_test_case.php on line 149

Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Argument #2 of PHPUnit_Framework_Assert::assertContains() must be a array, iterator or string' in /home/pie/apps/git-phpunit-bundle/PHPUnit/Util/InvalidArgumentHelper.php:69

Stack trace:

#0 /home/pie/apps/git-phpunit-bundle/PHPUnit/Framework/Assert.php(137): PHPUnit_Util_InvalidArgumentHelper::factory(2, 'array, iterator...')

#1 /home/pie/apps/phpbb/tests/test_framework/phpbb_functional_test_case.php(120): PHPUnit_Framework_Assert::assertContains('Welcome to Inst...', false)

#2 /home/pie/apps/phpbb/tests/test_framework/phpbb_functional_test_case.php(56): phpbb_functional_test_case->install_board()

#3 /home/pie/apps/git-phpunit-bundle/PHPUnit/Framework/TestSuite.php(554): phpbb_functional_test_case->__construct()

#4 /home/pie/apps/git-phpunit-bundle/PHPUnit/Framework/TestSuite.php(831): PHPUnit_Framework_TestSuite::createTest(Object(ReflectionClass), 'test_index')

#5 /home/pie/apps/git-phpunit-bundle/PHPUnit/Framework/TestSuite.php(214): PHPUnit_Frame in /home/pie/apps/git-phpunit-bundle/PHPUnit/Util/InvalidArgumentHelper.php on line 69