Single quotes all the way.

app/views/shared/members/_member.html.haml

@@ -61,7 +61,7 @@
           Joined #{time_ago_with_tooltip(member.created_at)}
         - if member.expires?
           ·
-          %span{ class: ("text-warning" if member_expires_soon?(member)) }
+          %span{ class: ('text-warning' if member_expires_soon?(member)) }
             Expires in #{distance_of_time_in_words_to_now(member.expires_at)}
 
     - else

app/workers/remove_expired_members_worker.rb

@@ -2,7 +2,7 @@ class RemoveExpiredMembersWorker
   include Sidekiq::Worker
 
   def perform
-    Member.where("expires_at <= ?", Time.current).find_each do |member|
+    Member.where('expires_at <= ?', Time.current).find_each do |member|
       begin
         Members::AuthorizedDestroyService.new(member).execute
       rescue => ex

spec/features/projects/members/master_adds_member_with_expiration_date_spec.rb

@@ -14,12 +14,12 @@ feature 'Projects > Members > Master adds member with expiration date', feature:
   end
 
   scenario 'expiration date is displayed in the members list' do
-    travel_to Time.zone.parse("2016-08-06 08:00") do
+    travel_to Time.zone.parse('2016-08-06 08:00') do
       visit namespace_project_project_members_path(project.namespace, project)
 
       page.within '.users-project-form' do
         select2(new_member.id, from: '#user_ids', multiple: true)
-        fill_in 'Access expiration date', with: "2016-08-10"
+        fill_in 'Access expiration date', with: '2016-08-10'
         click_on 'Add users to project'
       end
 
@@ -30,13 +30,13 @@ feature 'Projects > Members > Master adds member with expiration date', feature:
   end
 
   scenario 'change expiration date' do
-    travel_to Time.zone.parse("2016-08-06 08:00") do
-      project.team.add_users([new_member.id], :developer, expires_at: "2016-09-06")
+    travel_to Time.zone.parse('2016-08-06 08:00') do
+      project.team.add_users([new_member.id], :developer, expires_at: '2016-09-06')
       visit namespace_project_project_members_path(project.namespace, project)
 
       page.within '.project_member:first-child' do
         click_on 'Edit'
-        fill_in 'Access expiration date', with: "2016-08-09"
+        fill_in 'Access expiration date', with: '2016-08-09'
         click_on 'Save'
         expect(page).to have_content('Expires in 3 days')
       end

spec/workers/remove_expired_members_worker_spec.rb

@@ -6,18 +6,18 @@ describe RemoveExpiredMembersWorker do
   let!(:member_expiring_in_future) { create(:project_member, expires_at: 10.days.from_now) }
   let!(:non_expiring_member) { create(:project_member, expires_at: nil) }
 
-  describe "#perform" do
-    it "removes expired members" do
+  describe '#perform' do
+    it 'removes expired members' do
       expect { worker.perform }.to change { Member.count }.by(-1)
       expect(Member.find_by(id: expired_member.id)).to be_nil
     end
 
-    it "leaves members who expire in the future" do
+    it 'leaves members who expire in the future' do
       worker.perform
       expect(member_expiring_in_future.reload).to be_present
     end
 
-    it "leaves members who do not expire at all" do
+    it 'leaves members who do not expire at all' do
       worker.perform
       expect(non_expiring_member.reload).to be_present
     end