CODEWITHSUNDEEP
javascriptunit-testingpromisejestjs
lyssaloo
lyssaloo

Reputation: 31

Promise.allSettled is not a function in jest test, how to mock?

I have an action that uses Promise.allSettled to return multiple stat objects from an API. When I run the tests with mocking I get the error Promise.allSettled is not a function

I have a get endpoint to returns different types of stats. myapi.com/get_stats/:type

I have an action for this API as follows

  const types = ['seo', 'referrers', 'clicks', 'posts', 'videos'];
  const promises = [];
  types.forEach(type =>
    promises.push(
      api().stats.getStats(type),
    ),
  );
  Promise.allSettled(promises).then(res => {
    const { statData, statErrors } = mapData(res); // Data manipulation
    dispatch({ type: FETCH_STATS_RESOLVED, payload: { statData, statErrors } });
  });

My Test set up

jest.mock('api-file.js', () => ({
  api: () => ({
     stats: {
         getStats: type => {
           switch (type) {
              case: 'seo':
                return mockSeoStats;
           }
         }
      } 
  })
}));

in beforeEach()

mockSeoStats.mockImplementation(() => Promise.resolve({ value: {data: myData} }));

I can see that the Action is receiving these mocked values, but Promise.allSettled is complaining

I assume it's having a hard time with the jest mock structure

So, how can i mock Promise.allSettled to just return what I expect it to, instead of looking at my mocked functions?

Upvotes: 3

Views: 8868

Answers (2)

Shraddha Bhardwaj
Shraddha Bhardwaj

Reputation: 11

Try wrapping Promise.allSettled in try-catch block if you don't want to update node js.

Example:

try {
  Promise.allSettled([
    // your code
  ]).finally(() => {
    // your code`enter code here`
  });
} catch (e) {
  console.log('promise.allSettled', e);
}

Upvotes: -3

Diego Marquez
Diego Marquez

Reputation: 492

A similar question was asked at Execute batch of promise with Promise.allSettled() Promise.allSettled is available from Node version 12.0 +

You can update node using Node's version manager 

nvm ls
# Look for a 12.17.0 version (latest)
nvm install 12.17.0
# Automatically switches to new version
npm run test
# Should properly run your Promise.all

Hope that helped.

Upvotes: 5

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