Add phpunit requirement to composer.json
Revert "Add phpunit requirement to composer.json"

This reverts commit 87f0c160c42379b4530497b572a5d733d5578f01.
Create dummy instance for DatastorageInitResponse for buggy phpunit
Revert 'Create dummy instance for DatastorageInitResponse for buggy phpunit'
Create dummy instance for DatastorageInitResponse for buggy phpunit
Add correct camelcasing for case sensitive phpunit
Add identifier for PaymentRedirect
Reload config for every test run