Found this issue with Jest and babel 7

babel-jest does not transpile import/export in node_modules when Babel 7 is used

What worked for me was adding

"transformIgnorePatterns": [
  "node_modules/core-js",
  "node_modules/babel-runtime",
  "node_modules/lodash",
  "node_modules/vue"
],

to my jest config

Full config:

{
    "moduleFileExtensions": [
      "js",
      "vue"
    ],
    "collectCoverageFrom": [
      "**/*.{vue}"
    ],
    "transformIgnorePatterns": [
      "node_modules/core-js",
      "node_modules/babel-runtime",
      "node_modules/lodash",
      "node_modules/vue"
    ],
    "moduleNameMapper": {
      "quasar": "<rootDir>/node_modules/quasar-framework",
      "^src/(.*)$": "<rootDir>/src/$1",
      "^assets/(.*)$": "<rootDir>/src/assets/$1",
      "^@/(.*)$": "<rootDir>/src/components/$1",
      "^variables/(.*)$": "<rootDir>/src/themes/quasar.variables.sty/$1"
    },
    "transform": {
      "^.+\\.js$": "<rootDir>/node_modules/babel-jest",
      ".*\\.(vue)$": "<rootDir>/node_modules/vue-jest"
    },
    "mapCoverage": true
  }

.babelrc

{
  "presets": [["es2015", {"modules": false}], "stage-2"],
  "plugins": ["transform-runtime"],
  "comments": false,
  "env": {
    "test": {
      "plugins": [
        "transform-es2015-modules-commonjs"
      ]
    }
  }
}

installed extra packages:

• babel-jest
• babel-preset-env
• jest
• vue-jest