updated `jest` and `babel-jest` to `v23` fixed breaking change in `jest`: - https://github.com/facebook/jest/blob/master/CHANGELOG.md#2300 - https://github.com/facebook/jest/pull/5558 _edit:_ forgot to mention. test runner fix is based on: https://github.com/babel/babel/blob/master/packages/babel-parser/test/helpers/runFixtureTests.js#L11