Move the iteration #timebox_date_range spec to ee

Relates to https://gitlab.com/gitlab-org/gitlab-foss/-/issues/79666

ee/spec/helpers/timeboxes_helper_spec.rb

@@ -23,6 +23,23 @@ RSpec.describe TimeboxesHelper do
     end
   end
 
+  describe '#timebox_date_range' do
+    let(:yesterday) { Date.yesterday }
+    let(:tomorrow) { yesterday + 2 }
+    let(:format) { '%b %-d, %Y' }
+    let(:yesterday_formatted) { yesterday.strftime(format) }
+    let(:tomorrow_formatted) { tomorrow.strftime(format) }
+
+    context 'iteration' do
+      # Iterations always have start and due dates, so only A-B format is expected
+      it 'formats properly' do
+        iteration = build(:iteration, start_date: yesterday, due_date: tomorrow)
+
+        expect(timebox_date_range(iteration)).to eq("#{yesterday_formatted}–#{tomorrow_formatted}")
+      end
+    end
+  end
+
   describe '#show_burndown_placeholder?' do
     let_it_be(:user) { build(:user) }
 

spec/helpers/timeboxes_helper_spec.rb

@@ -58,15 +58,6 @@ RSpec.describe TimeboxesHelper do
       it { expect(result_for(start_date: yesterday)).to eq("started on #{yesterday_formatted}") }
       it { expect(result_for(start_date: yesterday, due_date: tomorrow)).to eq("#{yesterday_formatted}–#{tomorrow_formatted}") }
     end
-
-    context 'iteration' do
-      # Iterations always have start and due dates, so only A-B format is expected
-      it 'formats properly' do
-        iteration = build(:iteration, start_date: yesterday, due_date: tomorrow)
-
-        expect(timebox_date_range(iteration)).to eq("#{yesterday_formatted}–#{tomorrow_formatted}")
-      end
-    end
   end
 
   describe '#milestone_counts' do