The working filter unit tests

UriFiltersSpec.groovy

@Mock(UriFilters)
@TestFor(MyController)// Need a controller to test filters
class UriFiltersSpec extends Specification {

    void "myFilter() should set the names of the controller and action"() {
        setup:
            request.requestURI = '/some/path/here'

        when:
            withFilters(controller: 'my', action: 'index') { controller.index() }

        then:
            response.getHeader('controllerName') == 'my'
            response.getHeader('actionName') == 'index'

            response.contentAsString == 'success'
    }
}