Testing Promises in Jest

test(“If contentful is empty then nothing is sent to the db”, (done) => {

  const contentfulService=mockContentfulServiceFactory();

  const neo4jService=mockNeo4jServiceFactory();

  const log=mockLogFactory();

  const systemService=mockSystemServiceFactory();

  contentfulService.getAssets.mockReturnValue(     Promise.resolve(contentfulService.emptyResult));

 contentfulService.getEntries.mockReturnValue(     Promise.resolve(contentfulService.emptyResult));

 const transformService=transformServiceFactory(contentfulService, neo4jService,   contentfulBatchSize, log, systemService);

 transformService.copyContentfulSpaceToNeo4j();

  setTimeout( () => {

     expect(contentfulService.getAssets.mock.calls.length).toEqual(1);

     expect(contentfulService.getEntries.mock.calls.length).toEqual(1);

     expect(neo4jService.cypherCommand.mock.calls.length).toEqual(0);

     done();

    },

  1);

});