Add RSpec metadata tags for time traveling around specs

ee/spec/graphql/resolvers/dora_metrics_resolver_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Resolvers::DoraMetricsResolver do
+RSpec.describe Resolvers::DoraMetricsResolver, time_travel_to: '2021-05-01' do
   include GraphqlHelpers
 
   let_it_be(:guest) { create(:user) }
@@ -15,12 +15,6 @@ RSpec.describe Resolvers::DoraMetricsResolver do
   let(:current_user) { reporter }
   let(:args) { { metric: 'deployment_frequency' } }
 
-  around do |example|
-    travel_to '2021-05-01'.to_time do
-      example.run
-    end
-  end
-
   before_all do
     group.add_guest(guest)
     group.add_reporter(reporter)

ee/spec/helpers/trial_status_widget_helper_spec.rb

@@ -3,9 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe TrialStatusWidgetHelper, :saas do
-  describe 'data attributes for mounting Vue components' do
+  describe 'data attributes for mounting Vue components', :freeze_time do
     let(:trial_length) { 30 } # days
-    let(:today_for_specs) { Date.parse('2021-01-15') }
     let(:trial_days_remaining) { 18 }
     let(:trial_end_date) { Date.current.advance(days: trial_days_remaining) }
     let(:trial_start_date) { Date.current.advance(days: trial_days_remaining - trial_length) }
@@ -23,7 +22,6 @@ RSpec.describe TrialStatusWidgetHelper, :saas do
     end
 
     before do
-      travel_to today_for_specs
       build(:gitlab_subscription, :active_trial,
         namespace: group,
         trial_starts_on: trial_start_date,
@@ -37,10 +35,6 @@ RSpec.describe TrialStatusWidgetHelper, :saas do
       end
     end
 
-    after do
-      travel_back
-    end
-
     describe '#trial_status_popover_data_attrs' do
       using RSpec::Parameterized::TableSyntax
 

ee/spec/lib/gitlab/analytics/cycle_analytics/request_params_spec.rb

@@ -41,10 +41,8 @@ RSpec.describe Gitlab::Analytics::CycleAnalytics::RequestParams do
         params[:created_before] = nil
       end
 
-      it 'is valid' do
-        travel_to '2019-03-01' do
-          expect(subject).to be_valid
-        end
+      it 'is valid', time_travel_to: '2019-03-01' do
+        expect(subject).to be_valid
       end
     end
 

ee/spec/models/gitlab_subscription_spec.rb

@@ -9,11 +9,9 @@ RSpec.describe GitlabSubscription, :saas do
     let_it_be(plan) { create(plan) }
   end
 
-  describe 'default values' do
-    it do
-      travel_to(Date.today + 30) do
-        expect(subject.start_date).to eq(Date.today)
-      end
+  describe 'default values', time_travel: 30.days do
+    specify do
+      expect(subject.start_date).to eq(Date.today)
     end
   end
 

spec/support/time_travel.rb

+# frozen_string_literal: true
+
+require 'active_support/testing/time_helpers'
+
+RSpec.configure do |config|
+  config.include ActiveSupport::Testing::TimeHelpers
+
+  config.around(:example, :freeze_time) do |example|
+    freeze_time { example.run }
+  end
+
+  config.around(:example, :time_travel) do |example|
+    duration = example.metadata[:time_travel]
+
+    raise 'The time_travel RSpec metadata must have an ActiveSupport::Duration value (such as `30.days`).' unless duration.is_a?(ActiveSupport::Duration)
+
+    travel(duration) { example.run }
+  end
+
+  config.around(:example, :time_travel_to) do |example|
+    date_or_time = example.metadata[:time_travel_to]
+
+    unless date_or_time.respond_to?(:to_time) && date_or_time.to_time.present?
+      raise 'The time_travel_to RSpec metadata must have a Date or Time value.'
+    end
+
+    travel_to(date_or_time) { example.run }
+  end
+end

spec/support_specs/time_travel_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'time travel' do
+  describe ':freeze_time' do
+    it 'freezes time around a spec example', :freeze_time do
+      expect { sleep 0.1 }.not_to change { Time.now.to_f }
+    end
+  end
+
+  describe ':time_travel' do
+    today = Date.current
+
+    it 'time-travels by the given duration', time_travel: 3.days do
+      expect(Date.current).to eq(today + 3.days)
+    end
+
+    it 'works with negative durations', time_travel: -5.days do
+      expect(Date.current).to eq(today - 5.days)
+    end
+  end
+
+  describe ':time_travel_to' do
+    it 'time-travels to the specified date', time_travel_to: '2020-01-01' do
+      expect(Date.current).to eq(Date.new(2020, 1, 1))
+    end
+
+    it 'time-travels to the specified date & time', time_travel_to: '2020-02-02 10:30:45 -0700' do
+      expect(Time.current).to eq(Time.new(2020, 2, 2, 17, 30, 45, '+00:00'))
+    end
+  end
+end