add functional test (tbd)

x-pack/test/api_integration/apis/maps/proxy_api.js

@@ -0,0 +1,28 @@
+/*
+ * 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';
+
+export default function ({ getService }) {
+  const supertest = getService('supertest');
+
+  describe('EMS proxy', () => {
+    it('should correctly rewrite url and format', async () => {
+      const resp = await supertest
+        .get(`/api/maps/ems/files/v7.10/manifest`)
+        .set('kbn-xsrf', 'kibana')
+        .expect(200);
+
+      expect(resp.body.layers.length).to.be(66);
+
+      //Check world-layer
+      const worldLayer = resp.body.layers.find((layer) => layer.layer_id === 'world_countries');
+      expect(worldLayer.formats.length).to.be(1);
+      expect(worldLayer.formats[0].type).to.be('geojson');
+      expect(worldLayer.formats[0].url).to.be('file?id=world_countries');
+    });
+  });
+}