[ML] API test for datafeed preview (#187499)

Tests for `/internal/ml/datafeeds/<datafeedId>/_preview`

x-pack/test/api_integration/apis/ml/datafeeds/index.ts

@@ -12,5 +12,6 @@ export default function ({ loadTestFile }: FtrProviderContext) {
     loadTestFile(require.resolve('./get_with_spaces'));
     loadTestFile(require.resolve('./get_stats_with_spaces'));
     loadTestFile(require.resolve('./update'));
+    loadTestFile(require.resolve('./preview'));
   });
 }

x-pack/test/api_integration/apis/ml/datafeeds/preview.ts

@@ -0,0 +1,75 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import expect from '@kbn/expect';
+import { FtrProviderContext } from '../../../ftr_provider_context';
+import { USER } from '../../../../functional/services/ml/security_common';
+import { getCommonRequestHeader } from '../../../../functional/services/ml/common_api';
+
+export default ({ getService }: FtrProviderContext) => {
+  const ml = getService('ml');
+  const esArchiver = getService('esArchiver');
+  const spacesService = getService('spaces');
+  const supertest = getService('supertestWithoutAuth');
+
+  const jobIdSpace1 = 'fq_single_space1';
+  const datafeedIdSpace1 = `datafeed-${jobIdSpace1}`;
+  const idSpace1 = 'space1';
+  const idSpace2 = 'space2';
+
+  async function getDatafeedPreview(
+    datafeedId: string,
+    expectedStatusCode: number,
+    space?: string
+  ) {
+    const { body, status } = await supertest
+      .get(`${space ? `/s/${space}` : ''}/internal/ml/datafeeds/${datafeedId}/_preview`)
+      .auth(
+        USER.ML_POWERUSER_ALL_SPACES,
+        ml.securityCommon.getPasswordForUser(USER.ML_POWERUSER_ALL_SPACES)
+      )
+      .set(getCommonRequestHeader('1'));
+    ml.api.assertResponseStatusCode(expectedStatusCode, status, body);
+
+    return body;
+  }
+
+  describe('GET datafeed preview', () => {
+    before(async () => {
+      await spacesService.create({ id: idSpace1, name: 'space_one', disabledFeatures: [] });
+      await spacesService.create({ id: idSpace2, name: 'space_two', disabledFeatures: [] });
+      await esArchiver.loadIfNeeded('x-pack/test/functional/es_archives/ml/farequote');
+
+      const jobConfig = ml.commonConfig.getADFqSingleMetricJobConfig(jobIdSpace1);
+      await ml.api.createAnomalyDetectionJob(jobConfig, idSpace1);
+      const datafeedConfig = ml.commonConfig.getADFqDatafeedConfig(jobIdSpace1);
+      await ml.api.createDatafeed(datafeedConfig, idSpace1);
+
+      await ml.testResources.setKibanaTimeZoneToUTC();
+    });
+
+    after(async () => {
+      await spacesService.delete(idSpace1);
+      await spacesService.delete(idSpace2);
+      await ml.api.cleanMlIndices();
+      await ml.testResources.cleanMLSavedObjects();
+    });
+
+    it('should fail with non-existing datafeed', async () => {
+      await getDatafeedPreview('non-existing-datafeed', 404);
+    });
+
+    it('should return datafeed preview with datafeed id from correct space', async () => {
+      const body = await getDatafeedPreview(datafeedIdSpace1, 200, idSpace1);
+      expect(body.length).to.eql(1000, `response length should be 1000 (got ${body.length})`);
+    });
+
+    it('should fail with datafeed from different space', async () => {
+      await getDatafeedPreview(datafeedIdSpace1, 404, idSpace2);
+    });
+  });
+};