Add TimeCop freeze for DST and Regular time

spec/lib/gitlab/ci/cron_parser_spec.rb

@@ -77,12 +77,24 @@ describe Gitlab::Ci::CronParser do
 
           it_behaves_like "returns time in the future"
 
+          context 'when PST (Pacific Standard Time)' do
             it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 1, 1)) do
                 expect(subject.hour).to eq(hour_in_utc)
               end
             end
           end
 
+          context 'when PDT (Pacific Daylight Time)' do
+            it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 6, 1)) do
+                expect(subject.hour).to eq(hour_in_utc)
+              end
+            end
+          end
+        end
+      end
+
       context 'when cron_timezone is ActiveSupport::TimeZone format' do
         before do
           allow(Time).to receive(:zone)
@@ -100,10 +112,22 @@ describe Gitlab::Ci::CronParser do
 
           it_behaves_like "returns time in the future"
 
+          context 'when CET (Central European Time)' do
+            it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 1, 1)) do
+                expect(subject.hour).to eq(hour_in_utc)
+              end
+            end
+          end
+
+          context 'when CEST (Central European Summer Time)' do
             it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 6, 1)) do
                 expect(subject.hour).to eq(hour_in_utc)
               end
             end
+          end
+        end
 
         context 'when cron_timezone is Eastern Time (US & Canada)' do
           let(:cron) { '* 0 * * *' }
@@ -111,12 +135,24 @@ describe Gitlab::Ci::CronParser do
 
           it_behaves_like "returns time in the future"
 
+          context 'when EST (Eastern Standard Time)' do
+            it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 1, 1)) do
+                expect(subject.hour).to eq(hour_in_utc)
+              end
+            end
+          end
+
+          context 'when EDT (Eastern Daylight Time)' do
             it 'converts time in server time zone' do
+              Timecop.freeze(Time.utc(2017, 6, 1)) do
                 expect(subject.hour).to eq(hour_in_utc)
               end
             end
           end
         end
+      end
+    end
 
     context 'when cron and cron_timezone are invalid' do
       let(:cron) { 'invalid_cron' }