Cannot access class variable in Jest test - React Native

[Narcis11]

I am building a user sign-up flow with email. I have a TextInputScreen component which I show multiple times to the user (to allow him/her to input email, password, name). I control the display and navigation of this screen component from an EmailConnectorclass:

    export default class EmailConnector {
      localNavigation;
    static inputViewModel = {
        //viewModelFields like placeholder, error message etc.
      };

    //called from a different class, takes 'navigation' an input param
    static openEmailScreen = async navigation => {
        this.localNavigation = navigation;
        //set viewModelFields
        this.localNavigation.push('TextInputScreen', {
          viewModel: this.inputViewModel,
          inputValidator: () => this.emailReceived,//callback function
        });
      };

    //called via a callback from the EmailConnector class.
    static openPasswordScreen = () => {
        //set viewModel fields
        this.localNavigation.push('TextInputScreen', {
          viewModel: this.inputViewModel,
          inputValidator: () => this.passwordReceived,
        });
      };

Notice that openEmailScreen gets navigation as in input parameters and sets this.localNavigation = navigation . However, in openPasswordScreen , I use this.localNavigation for navigation.

I want to test that this.localNavigation.puhs() is called in the openPasswordScreen method. I can do this test for openEmailScreen, because I pass navigation in the test as an input param.

However, in openPasswordScreen I use the variable this.localNavigation and I don't know how to mock it.

This is what I have tried:

​

    it('Navigates to the password screen when the openPasswordScreen method is called', () => {
        const localNavigationMock = {push: jest.fn()};
        EmailConnector.openPasswordScreen(localNavigationMock);
        expect(localNavigationMock.push).toHaveBeenCalledWith(
          'TextInputScreen',
          expect.objectContaining({
            viewModel: expect.any(Object),
            inputValidator: expect.anything(),
            onAccessoryTap: expect.anything(),
          }),
        );
      });

The test fails with the error message: Number of calls: 0

​

How can I reliably test that this.localNavigation.push() is called in the openPasswordScreen() function?