It is not possible to suppress errors

[hulkthedev]

Hello, everyone,
it's everytime pain in my A.... to set up behat properly.
Everything is in the root, everything throws errors, everything has to be adjusted.

Supressing errors not possible...

define('BEHAT_ERROR_REPORTING', E_ERROR | E_WARNING | E_PARSE)
result in
Warning: Constant BEHAT_ERROR_REPORTING already defined

error_reporting in behat.yml have no effect, no matter where written

• defaults>calls>error_reporting
• defaults>suites>calls>error_reporting
• defaults>suites>default>calls>error_reporting

If i start behat tests, the entire env runs as dev, not as test. Why? Where to change?