Add test for IP blocker in API v3 github endpoint

ee/spec/requests/api/v3/github_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe API::V3::Github do
+  describe 'GET /repos/:namespace/:project/pulls' do
+    let_it_be(:private_group) { create(:group, :private) }
+    let_it_be(:ip_restriction) { create(:ip_restriction, group: private_group) }
+    let_it_be(:user) { create(:user) }
+    let_it_be(:project) { create(:project, :repository, creator: user, group: private_group) }
+
+    let(:user_agent) { 'Jira DVCS Connector/3.2.4' }
+    let(:path) { "/repos/#{project.namespace.path}/#{project.path}/pulls" }
+
+    before do
+      private_group.add_maintainer(user)
+    end
+
+    it 'returns status 200' do
+      get api(path, user, version: 'v3'), headers: { 'User-Agent' => user_agent }
+
+      expect(response).to have_gitlab_http_status(:ok)
+    end
+
+    context 'group_ip_restriction' do
+      before do
+        stub_licensed_features(group_ip_restriction: true)
+      end
+
+      it 'returns 404 for request from ip not in the range' do
+        get api(path, user, version: 'v3'), headers: { 'User-Agent' => user_agent }
+
+        expect(response).to have_gitlab_http_status(:not_found)
+      end
+    end
+  end
+end