message: cli: be more opinionated about what test files look like
diff: @@ -43,6 +43,9 @@ async function getConfig() {
  ),
  },
  + // A bit more opinionated
  + testMatch: ['**/?(*.)test.{js,jsx,mjs,ts,tsx}'],
  +
  // Default behaviour is to not apply transforms for node_modules, but we still want
  // to apply the esm-transformer to .esm.js files, since that's what we use in backstage packages.
  transformIgnorePatterns: [
  