Add comprehensive testing framework for both single site and multisite WordPress environments

cypress/e2e/multisite.cy.js

@@ -0,0 +1,43 @@
+describe('WordPress Multisite Tests', () => {
+  it('Can access the main site', () => {
+    cy.visit('/');
+    cy.get('body').should('exist');
+  });
+
+  it('Can access the test subsite', () => {
+    cy.visit('/testsite');
+    cy.get('body').should('exist');
+  });
+
+  it('Can login to the admin area', () => {
+    cy.visit('/wp-admin');
+    cy.get('#user_login').type('admin');
+    cy.get('#user_pass').type('password');
+    cy.get('#wp-submit').click();
+    cy.get('body.wp-admin').should('exist');
+  });
+
+  it('Can access network admin', () => {
+    // Login first
+    cy.visit('/wp-admin');
+    cy.get('#user_login').type('admin');
+    cy.get('#user_pass').type('password');
+    cy.get('#wp-submit').click();
+    
+    // Go to network admin
+    cy.visit('/wp-admin/network/');
+    cy.get('body.network-admin').should('exist');
+  });
+
+  it('Plugin is network activated', () => {
+    // Login first
+    cy.visit('/wp-admin');
+    cy.get('#user_login').type('admin');
+    cy.get('#user_pass').type('password');
+    cy.get('#wp-submit').click();
+    
+    // Check plugins page
+    cy.visit('/wp-admin/network/plugins.php');
+    cy.contains('tr', 'WP Plugin Starter Template').should('contain', 'Network Active');
+  });
+});