[zendframework/zf2#5015] Added unit tests
[zendframework/zf2#5015] Added unit tests

- Added tests to demonstrate that preferFormInputFilter flag can now be set via
  options and factory implementations.

MadCat34/zend-form,akrabat/zend-form,svycka/zend-form,zendframework/zend-form,svycka/zend-form,MadCat34/zend-form,zendframework/zend-form,adamlundrigan/zend-form,adamlundrigan/zend-form,marek-saji/zend-form,marek-saji/zend-form,akrabat/zend-form