Merge branch 'fix-failing-tests' into 'master'

This fixes a long running tests due to changed Sidekiq state

## What does this MR do?
Fixes a ordering of tests problem, where GroupsController tests change global state and this affects IrkerService

cc @connorshea 

See merge request !5819

spec/controllers/admin/groups_controller_spec.rb

@@ -7,13 +7,14 @@ describe Admin::GroupsController do
 
   before do
     sign_in(admin)
-    Sidekiq::Testing.fake!
   end
 
   describe 'DELETE #destroy' do
     it 'schedules a group destroy' do
+      Sidekiq::Testing.fake! do
         expect { delete :destroy, id: project.group.path }.to change(GroupDestroyWorker.jobs, :size).by(1)
       end
+    end
 
     it 'redirects to the admin group path' do
       delete :destroy, id: project.group.path

spec/controllers/groups_controller_spec.rb

@@ -89,13 +89,14 @@ describe GroupsController do
 
     context 'as the group owner' do
       before do
-        Sidekiq::Testing.fake!
         sign_in(user)
       end
 
       it 'schedules a group destroy' do
+        Sidekiq::Testing.fake! do
           expect { delete :destroy, id: group.path }.to change(GroupDestroyWorker.jobs, :size).by(1)
         end
+      end
 
       it 'redirects to the root path' do
         delete :destroy, id: group.path

spec/models/project_services/irker_service_spec.rb

@@ -52,19 +52,20 @@ describe IrkerService, models: true do
     let(:colorize_messages) { '1' }
 
     before do
+      @irker_server = TCPServer.new 'localhost', 0
+
       allow(irker).to receive_messages(
         active: true,
         project: project,
         project_id: project.id,
         service_hook: true,
-        server_host: 'localhost',
-        server_port: 6659,
+        server_host: @irker_server.addr[2],
+        server_port: @irker_server.addr[1],
         default_irc_uri: 'irc://chat.freenode.net/',
         recipients: recipients,
         colorize_messages: colorize_messages)
 
       irker.valid?
-      @irker_server = TCPServer.new 'localhost', 6659
     end
 
     after do