`How can you effectively simulate class modules in Jest?`

Working with the amplitude module requires me to start by creating an instance of a class and then use its methods. Here's the initial code snippet:

var Amplitude = require('amplitude');
const amplitude = new Amplitude(process.env.amplitudeApiKey);

Later on, I make a call to 

await amplitude.track({something: 'here'})
and now I want to create a mock for testing purposes so that the external library is not actually called and I can validate the arguments properly. The challenge here lies in having to instantiate a class before attempting to create mocks.

I have attempted using a __mocks__ directory but encountered issues due to TypeScript's automocking feature being enabled. I am stumped on how to proceed with mocking this specific scenario. Any suggestions or solutions would be greatly appreciated.

javascripttypescriptjestjsts-jest

Answer №1

After researching various methods, I decided to follow the strategy outlined in the official Jest documentation

const Amplitude = require('amplitude');
jest.mock('amplitude');

test('#trackInAmplitude function properly triggers the amplitude track event', async () => {
  // Insert code here that invokes my `track method`
  const mockAmplitude = Amplitude.mock.instances[0];
  expect(mockAmplitude.track.mock.calls[0][0]).toEqual('argument content');
});

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