Simplify spec based on review comments

ee/spec/controllers/projects/branches_controller_spec.rb

@@ -3,12 +3,10 @@
 require 'spec_helper'
 
 describe Projects::BranchesController do
-  let(:project) { create(:project, :repository) }
-  let(:user) { create(:user) }
+  set(:project) { create(:project, :repository) }
+  let(:user) { project.owner }
 
   before do
-    project.add_maintainer(user)
-
     allow(project).to receive(:branches).and_return(['master'])
     controller.instance_variable_set(:@project, project)
 
@@ -16,12 +14,11 @@ describe Projects::BranchesController do
   end
 
   describe 'GET #index' do
-    let(:import_state) { create(:import_state, next_execution_timestamp: Time.now, last_update_at: Time.now, last_successful_update_at: Time.now) }
-
+    context 'for mirrored projects with diverged branch' do
       render_views
 
       before do
-      project.update!(mirror: true, import_state: import_state, import_url: 'https://import.url', mirror_user: user)
+        create(:import_state, :mirror, :finished, project: project, last_successful_update_at: Time.now)
         allow(project.repository).to receive(:diverged_from_upstream?) { true }
       end
 
@@ -38,4 +35,5 @@ describe Projects::BranchesController do
         expect(response.body).to match(/diverged from upstream/)
       end
     end
+  end
 end