Render offline health questions on individual lines

It seems like Excel is not interpreting the new line character
correctly, so we need to add some styles to the cells to ensure the
content is word wrapped.

I don't have Excel to test this works correctly, but it's based on
reading through: https://stackoverflow.com/questions/25770025/rails-axlsx-new-line-in-cell

Author: thomasleese

app/lib/reports/export_formatters.rb

@@ -49,7 +49,7 @@ def health_question_answers(consents:)
         "#{question} #{formatted_responses.join(", ")}"
       end
 
-    values.join("\n")
+    values.join("\r\n")
   end
 
   def gillick_status(gillick_assessment:)

app/lib/reports/offline_session_exporter.rb

@@ -27,12 +27,22 @@ def self.call(*args, **kwargs)
   delegate :location, :organisation, to: :session
 
   def add_vaccinations_sheet(package)
+    package.use_shared_strings = true
+
     workbook = package.workbook
 
     date_style = workbook.styles.add_style(format_code: "dd/mm/yyyy")
+    wrap_style = workbook.styles.add_style(alignment: { wrap_text: true })
 
     types = headers_and_types.values
-    style = types.map { _1 == :date ? date_style : nil }
+    style =
+      headers_and_types.map do |header, type|
+        if type == :date
+          date_style
+        elsif header == "HEALTH_QUESTION_ANSWERS"
+          wrap_style
+        end
+      end
 
     workbook.add_worksheet(name: "Vaccinations") do |sheet|
       sheet.add_row(headers_and_types.keys)

spec/lib/reports/offline_session_exporter_spec.rb

@@ -191,6 +191,25 @@ def worksheet_to_hashes(worksheet)
             performed_at.to_date
           )
         end
+
+        context "with lots of health answers" do
+          before do
+            create(
+              :consent,
+              :from_dad,
+              :recorded,
+              patient:,
+              programme:,
+              health_questions_list: ["First question?", "Second question?"]
+            )
+          end
+
+          it "separates the answers by new lines" do
+            expect(rows.first["HEALTH_QUESTION_ANSWERS"]).to eq(
+              "First question? No from Dad\nSecond question? No from Dad"
+            )
+          end
+        end
       end
 
       context "with a patient who couldn't be vaccinated" do