Tengo una prueba muy simple:

 beforeAll(async () => { try { await db.connect(); } catch(e: any) { expect(e).toBeInstanceOf(Error); } });

pero falla con este mensaje realmente extraño

 expect(received).toBeInstanceOf(expected) Expected constructor: Error Received constructor: Error

así que sospecho que el valor de Error al ejecutar una prueba de broma se redefine.

broma.config.js:

 /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */ module.exports = { preset: "ts-jest", testEnvironment: "node", testPathIgnorePatterns: ["/node_modules/"] };

paquete parcial.json:

 { "devDependencies": { "@types/jest": "28.1.3", "@types/node": "18.0.0", "jest": "28.1.1", "ts-jest": "28.0.5", "ts-node": "10.8.1", "typescript": "4.7.4", }, "scripts": { "coverage": "jest --coverage", "test": "jest", } }

tsconfig.json:

 { "compilerOptions": { "alwaysStrict": true, "esModuleInterop": true, "moduleResolution": "Node", "noImplicitAny": true, "noImplicitThis": true, "noImplicitReturns": true, "strict": true, "strictBindCallApply": true, "strictFunctionTypes": true, "strictNullChecks": true, "strictPropertyInitialization": true, "target": "ESNext" }, "exclude": ["*.d.ts"], "include": ["*.ts", "test/*.ts"] }