Inside describe('getScoreCardData', () => {,

add a beforeEach block and include global.fetch = jest.fn(); in there

add an afterEach block and include

global.fetch.mockClear();
        delete global.fetch;

in there

useful to avoid mistakes like below, which can be a massive headache to discover (say you add new unit tests later on, happen to mock fetch, in some totally different file. they all fail for reasons that don't make any sense in the logs because your last mock in this file didn't delete global.fetch even though the others did

no delete global.fetch here

still "works" but only bc no other files with unit tests using this mock.

scoringCriteria

in general, best to avoid _ in variable names

scoring_criteria should be scoringCriteria

exceptions for constants, though JS convention there would be to also keep it all in block caps, e.g. SCORING_CRITERIA -- which, anyway, this isn't that kind of a constant

This function is doing two things

1. determine score based on a certain critera
2. sort exchanges alphabetically by name, then by lowest confirmation requirements, then by score

Need to at least change the name of the function to calculateScoreAndSortExchanges ... this is kind of awkward though, there's not really a good reason why both of these things should happen in the same function. Complicates review and unit tests.

You should probably split this up to be two functions, getScore and sortExchanges -- each with unit tests