add some functional tests

x-pack/test/api_integration/apis/telemetry/index.js

@@ -8,5 +8,6 @@ export default function ({ loadTestFile }) {
   describe('Telemetry', () => {
     loadTestFile(require.resolve('./telemetry'));
     loadTestFile(require.resolve('./telemetry_local'));
+    loadTestFile(require.resolve('./opt_in'));
   });
 }

x-pack/test/api_integration/apis/telemetry/opt_in.ts

@@ -0,0 +1,62 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import expect from '@kbn/expect';
+
+import { FtrProviderContext } from '../../ftr_provider_context';
+
+export default function optInTest({ getService }: FtrProviderContext) {
+  const supertest = getService('supertest');
+
+  describe('/api/telemetry/v2/optIn API', () => {
+    let kibanaVersion: any;
+
+    before(async () => {
+      const { body } = await supertest.get('/api/status').expect(200);
+      kibanaVersion = body.version.number;
+
+      expect(typeof kibanaVersion).to.eql('string');
+      expect(kibanaVersion.length).to.be.greaterThan(0);
+    });
+
+    it('should support sending false', async () => {
+      await postTelemetryV2Optin(supertest, false, 200);
+      const { enabled, lastVersionChecked } = await getSavedObjectAttributes(supertest);
+      expect(enabled).to.be(false);
+      expect(lastVersionChecked).to.be(kibanaVersion);
+    });
+
+    it('should support sending true', async () => {
+      await postTelemetryV2Optin(supertest, true, 200);
+      const { enabled, lastVersionChecked } = await getSavedObjectAttributes(supertest);
+      expect(enabled).to.be(true);
+      expect(lastVersionChecked).to.be(kibanaVersion);
+    });
+
+    it('should not support sending null', async () => {
+      await postTelemetryV2Optin(supertest, null, 400);
+    });
+
+    it('should not support sending junk', async () => {
+      await postTelemetryV2Optin(supertest, 42, 400);
+    });
+  });
+}
+
+async function postTelemetryV2Optin(supertest: any, value: any, statusCode: number): Promise<any> {
+  const { body } = await supertest
+    .post('/api/telemetry/v2/optIn')
+    .set('kbn-xsrf', 'xxx')
+    .send({ enabled: value })
+    .expect(statusCode);
+
+  return body;
+}
+
+async function getSavedObjectAttributes(supertest: any): Promise<any> {
+  const { body } = await supertest.get('/api/saved_objects/telemetry/telemetry').expect(200);
+  return body.attributes;
+}