specs for RemoteNode

spec/factories/doorkeeper.rb

 FactoryGirl.define do
   factory :doorkeeper_access_grant, class: Doorkeeper::AccessGrant do
     sequence(:resource_owner_id) { |n| n }
-    application
+    association :application, factory: :doorkeeper_application
     redirect_uri 'https://app.com/callback'
     expires_in 100
     scopes 'public write'
@@ -9,7 +9,7 @@ FactoryGirl.define do
 
   factory :doorkeeper_access_token, class: Doorkeeper::AccessToken do
     sequence(:resource_owner_id) { |n| n }
-    application
+    association :application, factory: :doorkeeper_application
     expires_in 2.hours
 
     factory :clientless_access_token do

spec/lib/gitlab/geo/remote_node_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Geo::RemoteNode do
+  subject { described_class.new }
+  let(:access_token) { FactoryGirl.create(:doorkeeper_access_token).token }
+  let(:user) { FactoryGirl.build(:user) }
+
+  before(:each) do
+    allow(subject).to receive(:primary_node_url) { 'http://localhost:3001/' }
+    allow(described_class).to receive(:get) { response }
+  end
+
+  describe '#authenticate' do
+    let(:response) { double }
+
+    context 'on success' do
+      it 'returns hashed user data' do
+        allow(response).to receive(:code) { 200 }
+        allow(response).to receive(:parsed_response) { user.to_json }
+
+        subject.authenticate(access_token)
+      end
+    end
+
+    context 'on invalid token' do
+      it 'raises exception' do
+        allow(response).to receive(:code) { 401 }
+
+        expect { subject.authenticate(access_token) }.to raise_error(Gitlab::Geo::RemoteNode::InvalidCredentialsError)
+      end
+    end
+  end
+end