enhance(e2e): more resilient version of `visit('/')` (#10128)

cypress/e2e/basic.cy.js

@@ -10,11 +10,11 @@ describe('Before setup instance', () => {
 	});
 
   it('successfully loads', () => {
-    cy.visit('/');
+    cy.visitHome();
   });
 
 	it('setup instance', () => {
-    cy.visit('/');
+    cy.visitHome();
 
 		cy.intercept('POST', '/api/admin/accounts/create').as('signup');
 
@@ -43,11 +43,11 @@ describe('After setup instance', () => {
 	});
 
   it('successfully loads', () => {
-    cy.visit('/');
+    cy.visitHome();
   });
 
 	it('signup', () => {
-		cy.visit('/');
+		cy.visitHome();
 
 		cy.intercept('POST', '/api/signup').as('signup');
 
@@ -79,11 +79,11 @@ describe('After user signup', () => {
 	});
 
   it('successfully loads', () => {
-    cy.visit('/');
+    cy.visitHome();
   });
 
 	it('signin', () => {
-		cy.visit('/');
+		cy.visitHome();
 
 		cy.intercept('POST', '/api/signin').as('signin');
 
@@ -101,7 +101,7 @@ describe('After user signup', () => {
 			userId: this.alice.id,
 		});
 
-		cy.visit('/');
+		cy.visitHome();
 
 		cy.get('[data-cy-signin]').click();
 		cy.get('[data-cy-signin-username] input').type('alice');

cypress/support/commands.js

@@ -24,6 +24,11 @@
 // -- This will overwrite an existing command --
 // Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })
 
+Cypress.Commands.add('visitHome', () => {
+	cy.visit('/');
+	cy.get('button', { timeout: 30000 }).should('be.visible');
+})
+
 Cypress.Commands.add('resetState', () => {
 	cy.window(win => {
 		win.indexedDB.deleteDatabase('keyval-store');
@@ -43,7 +48,7 @@ Cypress.Commands.add('registerUser', (username, password, isAdmin = false) => {
 });
 
 Cypress.Commands.add('login', (username, password) => {
-	cy.visit('/');
+	cy.visitHome();
 
 	cy.intercept('POST', '/api/signin').as('signin');