PHPUnit is greedy with RAM. I believe the default PHP memory limit is often only 128Mb, have you tried increasing this, or setting it to -1 to remove the limit

PHPUnit is greedy with RAM. I believe the default PHP memory limit is often only 128Mb, have you tried increasing this, or setting it to -1 to remove the limit? In php.ini, you need to change: memory_limit = 128M ;