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Jest TypeError: Cannot read property of undefined

I have a setup for an external application and start it within a const, then put it in the window.remote the configuration of the appConfig

export const setupRemote = () => {
  if (isRemoteAvailable) {
    try {
      ...

      const allowAppInstance = SetupConfig.start(remoteInstance);

      window.setup = {
        appConfig: allowAppInstance,
      };
    } catch (e) {
      console.error(e);
    }
  }
};

here I export

export const appSetupConfig = () => window.setup.appConfig;

in the component, I get this setup and put it in a const

import { appSetupConfig } from '.../myapp'

      useEffect(() => {
        const allowAppInstance = appSetupConfig();
    
        ...the rest of code
    
      }, []);

the application works, but when I run the tests, jest doesn't let it pass, it causes this error:

  TypeError: Cannot read property 'appConfig' of undefined

  43 | };
  44 | 
> 45 | export const appSetupConfig = () => window.setup.appConfig;

Is there any way to mock window.setup.appConfig to pass the test? I really don't know what to do and what am i doing wrong

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW

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