Test etag caching router and incorporate review

app/controllers/projects/environments_controller.rb

@@ -15,7 +15,7 @@ class Projects::EnvironmentsController < Projects::ApplicationController
     respond_to do |format|
       format.html
       format.json do
-        Gitlab::PollingInterval.set_header(response, interval: 15_000)
+        Gitlab::PollingInterval.set_header(response, interval: 3_000)
 
         render json: {
           environments: EnvironmentSerializer

app/models/deployment.rb

@@ -12,6 +12,7 @@ class Deployment < ActiveRecord::Base
   delegate :name, to: :environment, prefix: true
 
   after_create :create_ref
+  after_create :invalidate_cache
 
   def commit
     project.commit(sha)
@@ -33,6 +34,10 @@ class Deployment < ActiveRecord::Base
     project.repository.create_ref(ref, ref_path)
   end
 
+  def invalidate_cache
+    environment.expire_etag_cache
+  end
+
   def manual_actions
     @manual_actions ||= deployable.try(:other_actions)
   end

spec/controllers/projects/environments_controller_spec.rb

@@ -1,15 +1,15 @@
 require 'spec_helper'
 
 describe Projects::EnvironmentsController do
-  let(:user) { create(:user) }
+  set(:user) { create(:user) }
-  let(:project) { create(:empty_project) }
+  set(:project) { create(:empty_project) }
 
-  let(:environment) do
+  set(:environment) do
     create(:environment, name: 'production', project: project)
   end
 
   before do
-    project.team << [user, :master]
+    project.add_master(user)
 
     sign_in(user)
   end
@@ -57,6 +57,11 @@ describe Projects::EnvironmentsController do
           expect(json_response['available_count']).to eq 3
           expect(json_response['stopped_count']).to eq 1
         end
+
+        it 'sets the polling interval header' do
+          expect(response).to have_http_status(:ok)
+          expect(response.headers['Poll-Interval']).to eq("3000")
+        end
       end
 
       context 'when requesting stopped environments scope' do

spec/lib/gitlab/etag_caching/router_spec.rb

@@ -84,7 +84,8 @@ describe Gitlab::EtagCaching::Router do
 
     result = described_class.match(env)
 
-    expect(result).to be_blank
+    expect(result).to be_present
+    expect(result.name).to eq 'environments'
   end
 
   def build_env(path)

spec/models/deployment_spec.rb

@@ -16,6 +16,14 @@ describe Deployment, models: true do
   it { is_expected.to validate_presence_of(:ref) }
   it { is_expected.to validate_presence_of(:sha) }
 
+  describe 'after_create callbacks' do
+    it 'invalidates the cache for the environment' do
+      expect(subject).to receive(:invalidate_cache)
+
+      subject.save!
+    end
+  end
+
   describe '#includes_commit?' do
     let(:project)     { create(:project, :repository) }
     let(:environment) { create(:environment, project: project) }