Function expectLast

packages/react-dom/src/__tests__/ReactDOMFragmentRefs-test.js:1951–1953

(arr, test)

  describe('scrollIntoView', () => {
    function expectLast(arr, test) {
      expect(arr[arr.length - 1]).toBe(test);
    }
    // @gate enableFragmentRefs && enableFragmentRefsScrollIntoView
    it('does not yet support options', async () => {
      const fragmentRef = React.createRef();