Fix for GRAILS-10474: initialize grailsApplication instance before calling registerBeans in GrailsUnitTestMixin
GRAILS-10854: don't change application name in unit tests if it's already defined
GRAILS-10983: prevent "Method name must not be null" exception
Fix for GRAILS-10983: don't reuse cached GrailsApplicationAttributes.GRAILS_CONTROLLER_CLASS attribute in error handling requests
Merge branch '2.3.x'