1) phpbb_functional_search_mysql_test::test_search_backend

Failed asserting that 502 matches expected 200.

/home/travis/build/phpbb/phpbb/tests/test_framework/phpbb_functional_test_case.php:779

/home/travis/build/phpbb/phpbb/tests/test_framework/phpbb_functional_test_case.php:738

/home/travis/build/phpbb/phpbb/tests/test_framework/phpbb_functional_test_case.php:97

/home/travis/build/phpbb/phpbb/tests/functional/search/base.php:35

Fails on MySQL, Postgres and MariaDB, so likely to be a PHP issue rather than MySQL related. Started to fail after travis updated their images.