[5.3][cypress] smart search index & purge (joomla#45127)

* test smart serach index & purge

* afterEach

Author: alikon

tests/System/integration/administrator/components/com_finder/Index.cy.js

@@ -0,0 +1,28 @@
+describe('Test in backend that the Smart Search', () => {
+  beforeEach(() => {
+    cy.doAdministratorLogin();
+  });
+  afterEach(() => {
+    cy.task('queryDB', "DELETE FROM #__content WHERE title = 'Test article'");
+  });
+
+  it('can index an article', () => {
+    // Create a new article
+    cy.visit('/administrator/index.php?option=com_content&task=article.add');
+    cy.get('#jform_title').clear().type('Test article');
+    cy.clickToolbarButton('Save & Close');
+    // Visit the smart search page
+    cy.visit('/administrator/index.php?option=com_finder&view=index');
+    cy.contains('Test article').should('exist');
+  });
+
+  it('can purge the index', () => {
+    // Visit the smart search page
+    cy.visit('/administrator/index.php?option=com_finder&view=index');
+    cy.get('#toolbar-maintenance-group > button').click();
+    // Click the "Clear Index" button
+    cy.get('#maintenance-group-children-index-purge > button', { force: true }).click();
+    cy.clickDialogConfirm(true);
+    cy.checkForSystemMessage('All items have been deleted.');
+  });
+});