Jest has changed a lot lately. Back in September they changed the mocking to be opt-in. [1] The speed is also very much improved! [1] http://facebook.github.i

Jest has changed a lot lately. Back in September they changed the mocking to be opt-in. [1] The speed is also very much improved! [1] http://facebook.github.io/jest/blog/2016/09/01/jest-15.html#disabled-automocking http://facebook.github.io/jest/blog/2016/09/01/jest-15.html#...