@dynatrace-sdk/user-preferences

user-preferences

An abstraction layer that provides user preferences (like theme, language etc.) from environment on which the app is run.

Unit testing app using user-preferences package with jest

Prerequisite

Add in your jest.config.js file entry with @dynatrace-sdk/user-preferences/testing setup:

setupFiles: ['@dynatrace-sdk/user-preferences/testing]

Configuring user-preferences mock

Testing package comes with some default mocked values. For example if you use getTheme() function it will return auto string value.

There is also option to provide custom values and mocked functions:

import { mockUserPreferences } from '@dynatrace-sdk/user-preferences/testing';

const getThemeMock = () => 'dark';

mockUserPreferences({
  getTheme: getThemeMock,
});

With such configuration getTheme() will return dark instead of default auto value. There will be also possibility to check for example call count of getTheme method with jest API: expect(getThemeMock.mock.calls.length).toBe(2);

All other user-preferences package functions can be mocked in same way.