Function expectPosition

packages/react-dom/src/__tests__/ReactDOMFragmentRefs-test.js:1174–1185

(position, spec)

  describe('compareDocumentPosition', () => {
    function expectPosition(position, spec) {
      const positionResult = {
        following: (position & Node.DOCUMENT_POSITION_FOLLOWING) !== 0,
        preceding: (position & Node.DOCUMENT_POSITION_PRECEDING) !== 0,
        contains: (position & Node.DOCUMENT_POSITION_CONTAINS) !== 0,
        containedBy: (position & Node.DOCUMENT_POSITION_CONTAINED_BY) !== 0,
        disconnected: (position & Node.DOCUMENT_POSITION_DISCONNECTED) !== 0,
        implementationSpecific:
          (position & Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC) !== 0,
      };
      expect(positionResult).toEqual(spec);
    }
    // @gate enableFragmentRefs
    it('returns the relationship between the fragment instance and a given node', async () => {
      const fragmentRef = React.createRef();