Adds polling_controller specs

spec/controllers/polling_controller_spec.rb

@@ -1,5 +1,39 @@
 require 'spec_helper'
 
 describe PollingController do
+  describe 'polling for alerts' do
+    before do
+      allow(controller).to receive(:current_user).and_return true
+    end
 
+    after do
+      response.should be_success
+    end
+
+    it 'may find nothing' do
+      expect(controller).to receive(:uninstalling_gems).and_return []
+      expect(controller).to receive(:installing_gems).and_return []
+      get :alerts
+    end
+
+    it 'may find gems being uninstalled' do
+      expect(controller).to receive(:uninstalling_gems).and_return [
+        double(gem_name: "foobar", version: "1.0.0")
+      ]
+
+      allow(controller).to receive(:installing_gems).and_return []
+
+      get :alerts
+    end
+
+    it 'may find gems being installed' do
+      expect(controller).to receive(:installing_gems).and_return [
+        double(gem_name: "bazbang", version: "0.0.1")
+      ]
+
+      allow(controller).to receive(:uninstalling_gems).and_return []
+
+      get :alerts
+    end
+  end
 end