@isTest
private class  baft_DomainActionBase {
    @isTest
    private static void regressionCoverage() {
        Test.startTest();
        testDomainAction tda = new testDomainAction();
        tda.Execute(new baf_ServiceRequest().WithParam(
            'baf_TriggerRequest', 
            new baf_TriggerRequest(Account.getSObjectType())
                .SetBefore(true)
                .SetInsert(true)
                .SetNewRecords(new List<Account>())
                .SetNewRecordMap(new Map<Id, Account>())
            )
        );
        Test.stopTest();
    }

    private class testDomainAction extends baf_DomainActionBase {
        public override void ProcessAction(baf_TriggerRequest request) {
            if (request.targetSobject != Account.getSObjectType() || !request.isBefore || !request.isInsert) { return; }
            // actual data manipulation would happen here to suit the trigger's needs
        }
    }
}