Array.prototype[Symbol.iterator] = null stalls the process

[aaronabramov]

Array.prototype[Symbol.iterator] = null;
String.prototype[Symbol.iterator] = null;

test('test', () => {});

will never finish running until interrupted.

[thymikee]

Fixed in #3880

[SimenB]

This is broken since the test added was never run (it should be name .test.js, not -test.js). It was broken in #4016 and never discovered (jest-circus is broken in the same way)

[SimenB]

Well, It's broken in a different way now:

    TypeError: [object Array] is not iterable
        at Function.race (<anonymous>)

      at mapper (packages/jest-jasmine2/build/queue_runner.js:54:23)

the error varies across node versions

[rubennorte]

Well, wouldn't any modification on the built-in objects potentially affect the runner code?

[SimenB]

Yeah, but it really shouldn't - we should be able to isolate our own code from user code. That's a bigger issue, though. Not sure if it's possible to not run inside of the user context, and how that would impact leaking state between tests

[SimenB]

And now it at least throws an error instead of hanging the process, so I guess that's better tan the issue originally reported here

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