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Je suis tombé sur jestjs/jest#2663
qui préconise de faire
et d'installer identity-obj-proxy (ou la même chose avec https://github.com/eddyerburgh/jest-transform-stub).
C'est également ce que dit la doc officielle de Jest : https://jestjs.io/docs/en/webpack
(Next utilise https://webpack.js.org/)
Donc là j'ai juste créé deux fichiers bidons en suivant les indications.