[AO] Fix add_to_case functional test (#163155)

Fixes #156312, fixes #156677, fixes #156928, fixes #156929, fixes
#156588

## Summary

Fixes the functional test based on @dmlemeshko 's suggestion.

Flaky test runner [50]:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/2776
Flaky test runner [200]:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/2804
Flaky test runner [200]:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/2843
--> After the last change related to redirect, failures in this test are
related to #163427

[DONE] ~~**[On hold]** Will merge it after investigating
#156588 to make sure all the
related issues are fixed for this function test.~~

(cherry picked from commit b97059c)

x-pack/plugins/observability/public/pages/alerts/components/alert_actions.tsx

@@ -255,7 +255,11 @@ export function AlertActions({
           isOpen={isPopoverOpen}
           panelPaddingSize="none"
         >
-          <EuiContextMenuPanel size="s" items={actionsMenuItems} />
+          <EuiContextMenuPanel
+            size="s"
+            items={actionsMenuItems}
+            data-test-subj="alertsTableActionsMenu"
+          />
         </EuiPopover>
       </EuiFlexItem>
     </>

x-pack/test/functional/services/observability/alerts/add_to_case.ts

@@ -52,7 +52,8 @@ export function ObservabilityAlertsAddToCaseProvider({ getService }: FtrProvider
   };
 
   const closeFlyout = async () => {
-    return await (await testSubjects.find('euiFlyoutCloseButton')).click();
+    await testSubjects.click('euiFlyoutCloseButton'); // click close button
+    await testSubjects.missingOrFail('euiFlyoutCloseButton'); // wait for flyout to be closed
   };
 
   const getAddToExistingCaseModalOrFail = async () => {

x-pack/test/functional/services/observability/alerts/common.ts

@@ -20,6 +20,7 @@ const DATE_WITH_DATA = {
 const ALERTS_FLYOUT_SELECTOR = 'alertsFlyout';
 const FILTER_FOR_VALUE_BUTTON_SELECTOR = 'filterForValue';
 const ALERTS_TABLE_CONTAINER_SELECTOR = 'alertsTable';
+const ALERTS_TABLE_ACTIONS_MENU_SELECTOR = 'alertsTableActionsMenu';
 const VIEW_RULE_DETAILS_SELECTOR = 'viewRuleDetails';
 const VIEW_RULE_DETAILS_FLYOUT_SELECTOR = 'viewRuleDetailsFlyout';
 
@@ -209,6 +210,7 @@ export function ObservabilityAlertsCommonProvider({
   const openActionsMenuForRow = retryOnStale.wrap(async (rowIndex: number) => {
     const actionsOverflowButton = await getActionsButtonByIndex(rowIndex);
     await actionsOverflowButton.click();
+    await testSubjects.existOrFail(ALERTS_TABLE_ACTIONS_MENU_SELECTOR);
   });
 
   const viewRuleDetailsButtonClick = async () => {

x-pack/test/functional/services/observability/users.ts

@@ -11,9 +11,11 @@ import { FtrProviderContext } from '../../ftr_provider_context';
 type CreateRolePayload = Pick<Role, 'metadata' | 'elasticsearch' | 'kibana'>;
 
 const OBSERVABILITY_TEST_ROLE_NAME = 'observability-functional-test-role';
+const HOME_PAGE_SELECTOR = 'homeApp';
 
 export function ObservabilityUsersProvider({ getPageObject, getService }: FtrProviderContext) {
   const security = getService('security');
+  const testSubjects = getService('testSubjects');
   const commonPageObject = getPageObject('common');
 
   /**
@@ -24,7 +26,8 @@ export function ObservabilityUsersProvider({ getPageObject, getService }: FtrPro
    */
   const setTestUserRole = async (roleDefinition: CreateRolePayload) => {
     // return to neutral grounds to avoid running into permission problems on reload
-    await commonPageObject.navigateToActualUrl('kibana');
+    await commonPageObject.navigateToActualUrl('home');
+    await testSubjects.existOrFail(HOME_PAGE_SELECTOR);
 
     await security.role.create(OBSERVABILITY_TEST_ROLE_NAME, roleDefinition);
 

x-pack/test/observability_functional/apps/observability/pages/alerts/add_to_case.ts

@@ -25,8 +25,7 @@ export default ({ getService, getPageObjects }: FtrProviderContext) => {
       await esArchiver.unload('x-pack/test/functional/es_archives/observability/alerts');
     });
 
-    // FLAKY: https://github.com/elastic/kibana/issues/156312
-    describe.skip('When user has all privileges for cases', () => {
+    describe('When user has all privileges for cases', () => {
       before(async () => {
         await observability.users.setTestUserRole(
           observability.users.defineBasicObservabilityRole({
@@ -42,9 +41,7 @@ export default ({ getService, getPageObjects }: FtrProviderContext) => {
       });
 
       it('renders case options in the overflow menu', async () => {
-        await retry.try(async () => {
-          await observability.alerts.common.openActionsMenuForRow(0);
-        });
+        await observability.alerts.common.openActionsMenuForRow(0);
 
         await retry.try(async () => {
           await observability.alerts.addToCase.getAddToExistingCaseSelectorOrFail();
@@ -64,9 +61,7 @@ export default ({ getService, getPageObjects }: FtrProviderContext) => {
       });
 
       it('opens a modal when Add to existing case is clicked', async () => {
-        await retry.try(async () => {
-          await observability.alerts.common.openActionsMenuForRow(0);
-        });
+        await observability.alerts.common.openActionsMenuForRow(0);
 
         await retry.try(async () => {
           await observability.alerts.addToCase.addToExistingCaseButtonClick();
@@ -91,9 +86,8 @@ export default ({ getService, getPageObjects }: FtrProviderContext) => {
       });
 
       it('does not render case options in the overflow menu', async () => {
-        await retry.try(async () => {
-          await observability.alerts.common.openActionsMenuForRow(0);
-        });
+        await observability.alerts.common.openActionsMenuForRow(0);
+
         await retry.try(async () => {
           await observability.alerts.addToCase.missingAddToExistingCaseSelectorOrFail();
           await observability.alerts.addToCase.missingAddToNewCaseSelectorOrFail();