WIP: Move test to cypress.io

This is mostly just a PoC to see if our CI infrastructure is able to run
cypress.io tests.

Changing language currently triggers a "500 Parse Error" in cypress,
which needs to be fixed in Cockpit.

cypress/integration/application.js

@@ -0,0 +1,54 @@
+// Use this for skipping the login page, i. e. all tests which do not test the login page itself
+const visit_opts = { auth: { username: 'admin', password: 'foobar' } };
+
+describe('Application', () => {
+    beforeEach('start VM', function () {
+        cy.task('startVM').then(url => Cypress.config('baseUrl', url));
+
+        // Programmatically enable the "Reuse my password for privileged tasks" option
+        cy.server({
+            onAnyRequest: function (route, proxy) {
+                proxy.xhr.setRequestHeader('X-Authorize',  'password');
+            }
+        });
+    });
+
+    afterEach('stop VM', function() {
+        cy.task('stopVM');
+    });
+
+    it('basic functionality', function () {
+        // cypress doesn't handle frames, so go to specific frame
+        cy.visit('/cockpit/@localhost/starter-kit/index.html', visit_opts)
+        // verify expected heading
+        cy.get('.container-fluid h2').should('contain', 'Starter Kit');
+        // verify expected host name
+        cy.task('runVM', 'cat /etc/hostname').then(out => {
+            cy.get('.container-fluid p').should('contain', 'Running on ' + out.trim());
+        });
+    });
+
+    it('test with German translations', function() {
+        cy.visit('/', visit_opts);
+
+        // change language in menu
+        cy.get('#content-user-name').click();
+        cy.get('.display-language-menu a').click();
+        cy.get('#display-language select').select('de-de');
+
+        // HACK: language switching in Chrome not working in current session (Cockpit issue #8160)
+        cy.on('uncaught:exception', (err, runnable) => {
+            cy.log("Uncaught exception:", err);
+            return false;
+        });
+
+        // menu label (from manifest) should be translated
+        cy.get('#display-language-select-button').click();
+        cy.get("#host-apps a[href='/starter-kit']").should('contain', 'Bausatz');
+
+        // page label (from js) should be translated
+        cy.visit('/cockpit/@localhost/starter-kit/index.html');
+        cy.get('.container-fluid p').should('contain', 'Läuft auf');
+    });
+
+})