replace Timecop with ActiveSupport::Testing::TimeHelpers

resolves #525

Gemfile

@@ -98,7 +98,6 @@ group :development, :test do
   gem "simplecov", require: false
   gem "simplecov-cobertura", require: false
   gem "simplecov-json", require: false
-  gem "timecop"
 end
 
 group :production do

Gemfile.lock

@@ -516,7 +516,6 @@ GEM
     thor (1.2.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    timecop (0.9.5)
     turbo-rails (1.1.1)
       actionpack (>= 6.0.0)
       activejob (>= 6.0.0)
@@ -637,7 +636,6 @@ DEPENDENCIES
   simplecov-cobertura
   simplecov-json
   spring (~> 4.0)
-  timecop
   turbolinks (~> 2.5.3)
   twitter
   twitter-text

spec/controllers/ajax/moderation_controller_spec.rb

@@ -4,6 +4,8 @@
 require "rails_helper"
 
 describe Ajax::ModerationController, :ajax_controller, type: :controller do
+  include ActiveSupport::Testing::TimeHelpers
+
   shared_examples "fails when report does not exist" do
     let(:report_id) { "Burgenland" }
     let(:expected_response) do
@@ -147,7 +149,7 @@ describe Ajax::ModerationController, :ajax_controller, type: :controller do
           let(:duration_unit) { 'hours' }
 
           it "bans the user for 3 hours" do
-            Timecop.freeze do
+            freeze_time do
               expect { subject }.to change { target_user.reload.banned? }.from(false).to(true)
               expect(target_user.bans.current.first.reason).to eq("just a prank, bro")
               expect(target_user.bans.current.first.expires_at.to_i).to eq((Time.now.utc + 3.hours).to_i)

spec/controllers/settings/two_factor_authentication/otp_authentication_controller_spec.rb

@@ -3,6 +3,8 @@
 require "rails_helper"
 
 describe Settings::TwoFactorAuthentication::OtpAuthenticationController, type: :controller do
+  include ActiveSupport::Testing::TimeHelpers
+
   let(:user) do
     FactoryBot.create :user,
                       otp_module:     :disabled,
@@ -47,7 +49,7 @@ describe Settings::TwoFactorAuthentication::OtpAuthenticationController, type: :
         end
 
         it "shows an error if the user enters the incorrect code" do
-          Timecop.freeze(Time.at(1603290888).utc) do
+          travel_to(Time.at(1603290888).utc) do
             subject
             expect(response).to redirect_to :settings_two_factor_authentication_otp_authentication
             expect(flash[:error]).to eq("The code you entered was invalid.")
@@ -63,7 +65,7 @@ describe Settings::TwoFactorAuthentication::OtpAuthenticationController, type: :
         end
 
         it "enables 2FA for the logged in user and generates recovery keys" do
-          Timecop.freeze(Time.at(1603290888).utc) do
+          travel_to(Time.at(1603290888).utc) do
             subject
             expect(response).to have_rendered(:recovery_keys)
 
@@ -72,7 +74,7 @@ describe Settings::TwoFactorAuthentication::OtpAuthenticationController, type: :
         end
 
         it "shows an error if the user attempts to use the code once it has expired" do
-          Timecop.freeze(Time.at(1603290950).utc) do
+          travel_to(Time.at(1603290950).utc) do
             subject
             expect(response).to redirect_to :settings_two_factor_authentication_otp_authentication
             expect(flash[:error]).to eq(I18n.t("errors.invalid_otp"))

spec/helpers/bootstrap_helper_spec.rb

@@ -1,6 +1,8 @@
 require "rails_helper"
 
 describe BootstrapHelper, :type => :helper do
+  include ActiveSupport::Testing::TimeHelpers
+
   describe '#nav_entry' do
     it 'should return a HTML navigation item which links to a given address' do
       allow(self).to receive(:current_page?).and_return(false)
@@ -88,9 +90,9 @@ describe BootstrapHelper, :type => :helper do
 
   describe "#time_tooltip" do
     it 'should return a tooltip with proper time values' do
-      Timecop.freeze(Time.utc(1984)) do
+      travel_to(Time.utc(1984)) do
         @user = FactoryBot.create(:user)
-        Timecop.travel(Time.now.utc + 10.minutes)
+        travel 10.minutes
 
         expect(time_tooltip(@user)).to eq("<span title=\"Sun, 01 Jan 1984 00:00:00 +0000\" data-toggle=\"tooltip\" data-placement=\"bottom\">10 minutes</span>")
       end

spec/lib/exporter_spec.rb

@@ -4,6 +4,8 @@ require "rails_helper"
 require "exporter"
 
 RSpec.describe Exporter do
+  include ActiveSupport::Testing::TimeHelpers
+
   let(:user_params) do
     {
       answered_count:                    144,
@@ -311,7 +313,7 @@ RSpec.describe Exporter do
     subject { instance.send(:publish) }
 
     it "publishes an archive" do
-      Timecop.freeze do
+      freeze_time do
         expect { subject }.to change { user.export_processing }.from(true).to(false)
         expect(File.exist?("#{fake_rails_root}/public/export/#{name}.tar.gz")).to eq(true)
         expect(user.export_url).to eq("https://example.com/export/#{name}.tar.gz")

spec/models/announcement_spec.rb

@@ -3,6 +3,8 @@
 require "rails_helper"
 
 RSpec.describe(Announcement, type: :model) do
+  include ActiveSupport::Testing::TimeHelpers
+
   let!(:user) { FactoryBot.create :user }
   let!(:me) do
     Announcement.new(
@@ -19,15 +21,15 @@ RSpec.describe(Announcement, type: :model) do
     end
 
     it "returns false when the current time is before starts_at" do
-      Timecop.freeze(me.starts_at - 1.second)
+      travel_to(me.starts_at - 1.second)
       expect(me.active?).to be(false)
-      Timecop.return
+      travel_back
     end
 
     it "returns false when the current time is after ends_at" do
-      Timecop.freeze(me.ends_at)
+      travel_to(me.ends_at + 1.second)
       expect(me.active?).to be(false)
-      Timecop.return
+      travel_back
     end
   end