accounts-frontend/tests/polyfills.test.js

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import expect from 'unexpected';
describe('promise.prototype.finally', () => {
it('should be invoked after promise resolved', () =>
expect(new Promise((resolve) =>
Promise.resolve().finally(resolve)
), 'to be fulfilled')
);
it('should be invoked after promise rejected', () =>
expect(new Promise((resolve) =>
expect(Promise.reject().finally(resolve), 'to be rejected')
), 'to be fulfilled')
);
});