Disallow explicitly returning from tests (no-test-return-statement)

Tests in Jest should be void and not return values.

If you are returning Promises then you should update the test to use async/await.

Rule details

This rule triggers a warning if you use a return statement inside a test body.

```js /eslint jest/no-test-return-statement: "error"/

// valid:

it('noop', function () {});

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

test('one arrow', () => expect(1).toBe(1));

test('empty');

test('one', () => { expect(1).toBe(1); });

it('one', function () { expect(1).toBe(1); });

it('returning a promise', async () => { await new Promise(res => setTimeout(res, 100)); expect(1).toBe(1); });

// invalid: test('return an expect', () => { return expect(1).toBe(1); });

it('returning a promise', function () { return new Promise(res => setTimeout(res, 100)).then(() => expect(1).toBe(1)); }); ```