[ML] Adding tests for ML's field caps endpoint (#104315)

* [ML] Adding tests for ML's field caps endpoint

* fixing typos

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

@@ -68,17 +68,18 @@ export default function ({ getService, loadTestFile }: FtrProviderContext) {
       await ml.testResources.resetKibanaTimeZone();
     });
 
-    loadTestFile(require.resolve('./modules'));
+    loadTestFile(require.resolve('./annotations'));
     loadTestFile(require.resolve('./anomaly_detectors'));
+    loadTestFile(require.resolve('./calendars'));
+    loadTestFile(require.resolve('./data_frame_analytics'));
     loadTestFile(require.resolve('./data_visualizer'));
     loadTestFile(require.resolve('./fields_service'));
+    loadTestFile(require.resolve('./filters'));
+    loadTestFile(require.resolve('./indices'));
     loadTestFile(require.resolve('./job_validation'));
     loadTestFile(require.resolve('./jobs'));
+    loadTestFile(require.resolve('./modules'));
     loadTestFile(require.resolve('./results'));
-    loadTestFile(require.resolve('./data_frame_analytics'));
-    loadTestFile(require.resolve('./filters'));
-    loadTestFile(require.resolve('./calendars'));
-    loadTestFile(require.resolve('./annotations'));
     loadTestFile(require.resolve('./saved_objects'));
     loadTestFile(require.resolve('./system'));
   });

x-pack/test/api_integration/apis/ml/indices/field_caps.ts

@@ -0,0 +1,70 @@
+/*
+ * 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 { COMMON_REQUEST_HEADERS } from '../../../../functional/services/ml/common_api';
+import { USER } from '../../../../functional/services/ml/security_common';
+
+export default ({ getService }: FtrProviderContext) => {
+  const supertest = getService('supertestWithoutAuth');
+  const esArchiver = getService('esArchiver');
+  const ml = getService('ml');
+
+  async function runRequest(
+    index: string,
+    fields?: string[]
+  ): Promise<{ indices: string[]; fields: any }> {
+    const { body } = await supertest
+      .post(`/api/ml/indices/field_caps`)
+      .auth(USER.ML_POWERUSER, ml.securityCommon.getPasswordForUser(USER.ML_POWERUSER))
+      .set(COMMON_REQUEST_HEADERS)
+      .send({ index, fields })
+      .expect(200);
+
+    return body;
+  }
+
+  describe('field_caps', () => {
+    before(async () => {
+      await esArchiver.loadIfNeeded('x-pack/test/functional/es_archives/ml/farequote');
+    });
+
+    after(async () => {
+      await ml.api.cleanMlIndices();
+    });
+
+    it('selected fields in index', async () => {
+      const { indices, fields } = await runRequest('ft_farequote', ['airline', 'responsetime']);
+      expect(indices.length).to.eql(
+        1,
+        `Expected number of indices to be 1, but got ${indices.length}`
+      );
+      const fieldsLength = Object.keys(fields).length;
+      expect(fieldsLength).to.eql(2, `Expected number of fields to be 2, but got ${fieldsLength}`);
+      expect(fields.airline.keyword.type).to.eql('keyword', 'Expected airline type to be keyword');
+      expect(fields.responsetime.float.type).to.eql(
+        'float',
+        'Expected responsetime type to be float'
+      );
+    });
+
+    it('all fields in index', async () => {
+      const { indices, fields } = await runRequest('ft_farequote');
+      expect(indices.length).to.eql(
+        1,
+        `Expected number of indices to be 1, but got ${indices.length}`
+      );
+      const fieldsLength = Object.keys(fields).length;
+      expect(fieldsLength).to.eql(
+        21,
+        `Expected number of fields to be 21, but got ${fieldsLength}`
+      );
+    });
+  });
+};

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

@@ -0,0 +1,14 @@
+/*
+ * 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 { FtrProviderContext } from '../../../ftr_provider_context';
+
+export default function ({ loadTestFile }: FtrProviderContext) {
+  describe('system', function () {
+    loadTestFile(require.resolve('./field_caps'));
+  });
+}