[prefer-expect-assertions]: ensure expect.assertions is used when an expect is found to be within a loop

It would be nice to have a lint rule that enforced a length check or use of expect.assertions when an expect call is found inside a loop.

for example:

for(let thing in things) {
  expect(thing).toBe("2");
}

would report an error

but this would not:

expect.assertions(4);

for(let thing in things) {
  expect(thing).toBe("2");
}

nor would this:

expect(things).toHaveLength(4);

for(let thing in things) {
  expect(thing).toBe("2");
}

Main goal here is to prevent false positive tests if things is an empty list.

[G-Rath]

Have implemented an option for native loops in #1013

[github-actions[bot]]

🎉 This issue has been resolved in version 25.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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