impersonation-banner/__tests__/impersonation-banner.test.js

A banner that shows when a Keycloak impersonator is active

/**
 * @jest-environment jsdom
 */
const { injectImpersonationBanner } = require('../src/impersonation-banner');

describe('injectImpersonationBanner', () => {
    beforeEach(() => {
        document.body.innerHTML = '';
        localStorage.clear();
        jest.spyOn(window.location, 'reload').mockImplementation(() => {});
    });

    afterEach(() => {
        window.location.reload.mockRestore();
    });

    it('should render impersonating banner if realUserId !== currentUserId', () => {
        localStorage.setItem('realUserId', 'admin');
        localStorage.setItem('currentUserId', 'user');

        injectImpersonationBanner();

        const banner = document.getElementById('impersonation-banner');
        expect(banner).not.toBeNull();
        expect(banner.textContent).toContain('impersonating');
    });

    it('should remove realUserId and call reload on stop click', () => {
        localStorage.setItem('realUserId', 'admin');
        localStorage.setItem('currentUserId', 'user');

        injectImpersonationBanner();

        const stopBtn = document.getElementById('stop-impersonation');
        stopBtn.click();

        expect(localStorage.getItem('realUserId')).toBeNull();
        expect(window.location.reload).toHaveBeenCalled();
    });
});