New Ideas: Automated Engineering of Metamorphic Testing Environments for Domain-Specific Languages - Canizares, Pablo C; Canizares, Pablo C; Gomez-Abajo, Pablo; Nunez, Alberto; Guerra, Esther; de Lara, Juan (PROCEEDINGS OF THE 14TH ACM SIGPLAN INTERNATIONAL CONFERENCE ON SOFTWARE LANGUAGE ENGINEERING, SLE 2021, 2021)