Fix bug in reporting "months" helper

app/jobs/reports/month_helper.rb

@@ -15,6 +15,8 @@ module MonthHelper
     # @param [Range<Date>] date_range
     # @return [Array<Range<Date>>]
     def months(date_range)
+      return [date_range] if start_end_same_month?(date_range)
+
       results = []
 
       results << (date_range.begin..date_range.begin.end_of_month)
@@ -33,5 +35,13 @@ def months(date_range)
 
       results
     end
+
+    # @api private
+    def start_end_same_month?(date_range)
+      start_date = date_range.begin
+      end_date = date_range.end
+
+      start_date.year == end_date.year && start_date.month == end_date.month
+    end
   end
 end

spec/jobs/reports/month_helper_spec.rb

@@ -21,5 +21,13 @@
         ],
       )
     end
+
+    it 'correctly returns a partial month when the first month is a partial month' do
+      expect(months(Date.new(2022, 1, 1)..Date.new(2022, 1, 28))).to eq(
+        [
+          Date.new(2022, 1, 1)..Date.new(2022, 1, 28),
+        ],
+      )
+    end
   end
 end