Add groupMembers to api.js

app/assets/javascripts/api.js

@@ -5,6 +5,7 @@ import axios from './lib/utils/axios_utils';
 const Api = {
   groupsPath: '/api/:version/groups.json',
   groupPath: '/api/:version/groups/:id',
+  groupMembersPath: '/api/:version/groups/:id/members',
   subgroupsPath: '/api/:version/groups/:id/subgroups',
   namespacesPath: '/api/:version/namespaces.json',
   groupProjectsPath: '/api/:version/groups/:id/projects.json',
@@ -40,6 +41,12 @@ const Api = {
     });
   },
 
+  groupMembers(id) {
+    const url = Api.buildUrl(this.groupMembersPath).replace(':id', encodeURIComponent(id));
+
+    return axios.get(url);
+  },
+
   // Return groups list. Filtered by query
   groups(query, options, callback = $.noop) {
     const url = Api.buildUrl(Api.groupsPath);

spec/javascripts/api_spec.js

@@ -49,6 +49,22 @@ describe('Api', () => {
     });
   });
 
+  describe('groupMembers', () => {
+    it('fetches group members', done => {
+      const groupId = '54321';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/groups/${groupId}/members`;
+      const expectedData = [{ id: 7 }];
+      mock.onGet(expectedUrl).reply(200, expectedData);
+
+      Api.groupMembers(groupId)
+        .then(({ data }) => {
+          expect(data).toEqual(expectedData);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+
   describe('groups', () => {
     it('fetches groups', done => {
       const query = 'dummy query';