[8.8] [ML] Functional tests - stabilize and re-enable export jobs tes…

…ts (#152334) (#156480)

# Backport

This will backport the following commits from `main` to `8.8`:
- [[ML] Functional tests - stabilize and re-enable export jobs tests
(#152334)](#152334)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Robert
Oskamp","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-05-03T08:19:44Z","message":"[ML]
Functional tests - stabilize and re-enable export jobs tests
(#152334)\n\nThis PR re-enables the export job tests and the reporting
download tests\r\nafter the underlying issues has been fixed by
switching to the new\r\nheadless browser
mode.","sha":"a90f4c24dac8d6d23105e1a5119c36634aa27f42","branchLabelMapping":{"^v8.9.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":[":ml","release_note:skip","backport:prev-minor","v8.8.0","v8.9.0"],"number":152334,"url":"https://github.com/elastic/kibana/pull/152334","mergeCommit":{"message":"[ML]
Functional tests - stabilize and re-enable export jobs tests
(#152334)\n\nThis PR re-enables the export job tests and the reporting
download tests\r\nafter the underlying issues has been fixed by
switching to the new\r\nheadless browser
mode.","sha":"a90f4c24dac8d6d23105e1a5119c36634aa27f42"}},"sourceBranch":"main","suggestedTargetBranches":["8.8"],"targetPullRequestStates":[{"branch":"8.8","label":"v8.8.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.9.0","labelRegex":"^v8.9.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/152334","number":152334,"mergeCommit":{"message":"[ML]
Functional tests - stabilize and re-enable export jobs tests
(#152334)\n\nThis PR re-enables the export job tests and the reporting
download tests\r\nafter the underlying issues has been fixed by
switching to the new\r\nheadless browser
mode.","sha":"a90f4c24dac8d6d23105e1a5119c36634aa27f42"}}]}] BACKPORT-->

Co-authored-by: Robert Oskamp <[email protected]>

x-pack/test/functional/apps/dashboard/group3/reporting/download_csv.ts

@@ -67,12 +67,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     await testSubjects.existOrFail('csvDownloadStarted'); // validate toast panel
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/150561
-  // Failing: See https://github.com/elastic/kibana/issues/150562
-  // Failing: See https://github.com/elastic/kibana/issues/148314
-  // Failing: See https://github.com/elastic/kibana/issues/150563
-  // Failing: See https://github.com/elastic/kibana/issues/150561
-  describe.skip('Download CSV', () => {
+  describe('Download CSV', () => {
     before('initialize tests', async () => {
       log.debug('ReportingPage:initTests');
       await browser.setWindowSize(1600, 850);

x-pack/test/functional/apps/ml/stack_management_jobs/export_jobs.ts

@@ -251,9 +251,9 @@ export default function ({ getService }: FtrProviderContext) {
   const esArchiver = getService('esArchiver');
   const ml = getService('ml');
 
-  // Failing: See https://github.com/elastic/kibana/issues/150557
-  describe.skip('export jobs', function () {
+  describe('export jobs', function () {
     this.tags(['ml']);
+
     before(async () => {
       await ml.api.cleanMlIndices();
       await esArchiver.loadIfNeeded('x-pack/test/functional/es_archives/ml/farequote');
@@ -282,6 +282,7 @@ export default function ({ getService }: FtrProviderContext) {
       await ml.navigation.navigateToStackManagement();
       await ml.navigation.navigateToStackManagementJobsListPage();
     });
+
     after(async () => {
       await ml.api.cleanMlIndices();
       ml.stackManagementJobs.deleteExportedFiles([

x-pack/test/functional/services/ml/stack_management_jobs.ts

@@ -327,7 +327,7 @@ export function MachineLearningStackManagementJobsProvider({
 
     async getDownload(filePath: string) {
       return retry.tryForTime(5000, async () => {
-        expect(fs.existsSync(filePath)).to.be(true);
+        expect(fs.existsSync(filePath)).to.eql(true, `File path ${filePath} should exist`);
         return fs.readFileSync(filePath).toString();
       });
     },