CLDC-1913 Change date question hint text (#1293)

* change hardcoded date text to today's date formatted correctly

* update to show an example date in the tax year of the relevant log where that year is known

* move helper method and reuse some existing logic, adjust tests accordingly

app/helpers/collection_time_helper.rb

@@ -12,6 +12,11 @@ module CollectionTimeHelper
     Time.zone.local(collection_start_year(date), 4, 1)
   end
 
+  def date_mid_collection_year_formatted(date)
+    example_date = date.nil? ? Time.zone.today : collection_start_date(date).to_date + 5.months
+    example_date.to_formatted_s(:govuk_date_number_month)
+  end
+
   def current_collection_start_date
     Time.zone.local(current_collection_start_year, 4, 1)
   end

app/views/form/_date_question.html.erb

@@ -3,7 +3,7 @@
 <%= f.govuk_date_field question.id.to_sym,
   caption: caption(caption_text, page_header, conditional),
   legend: legend(question, page_header, conditional),
-  hint: { text: question.hint_text&.html_safe || "For example, 1 9 2022." },
+  hint: { text: question.hint_text&.html_safe || "For example, #{date_mid_collection_year_formatted(lettings_log.startdate)}" },
   width: 20,
   **stimulus_html_attributes(question) do %>
   <%= govuk_inset_text(text: question.unresolved_hint_text) if question.unresolved_hint_text.present? && @log.unresolved %>

config/initializers/date_formats.rb

@@ -2,6 +2,7 @@ Time::DATE_FORMATS[:govuk_date] = "%-d %B %Y"
 Time::DATE_FORMATS[:govuk_date_short_month] = "%-d %b %Y"
 Date::DATE_FORMATS[:govuk_date] = "%-d %B %Y"
 Date::DATE_FORMATS[:govuk_date_short_month] = "%-d %b %Y"
+Date::DATE_FORMATS[:govuk_date_number_month] = "%-d %-m %Y"
 
 Time::DATE_FORMATS[:month_and_year] = "%B %Y"
 Date::DATE_FORMATS[:month_and_year] = "%B %Y"

spec/helpers/collection_time_helper_spec.rb

@@ -4,13 +4,13 @@ RSpec.describe CollectionTimeHelper do
   let(:current_user) { create(:user, :data_coordinator) }
   let(:user) { create(:user, :data_coordinator) }
 
+  describe "Current collection start year" do
     around do |example|
       Timecop.freeze(now) do
         example.run
       end
     end
 
-  describe "Current collection start year" do
     context "when the date is after 1st of April" do
       let(:now) { Time.utc(2022, 8, 3) }
 
@@ -77,4 +77,35 @@ RSpec.describe CollectionTimeHelper do
       end
     end
   end
+
+  describe "#date_mid_collection_year_formatted" do
+    subject(:result) { date_mid_collection_year_formatted(input) }
+
+    context "when called with nil" do
+      let(:input) { nil }
+
+      it "returns the current date" do
+        today = Time.zone.today
+        expect(result).to eq("#{today.day} #{today.month} #{today.year}")
+      end
+    end
+
+    context "when called with a date after the first of April" do
+      calendar_year = 2030
+      let(:input) { Date.new(calendar_year, 7, 7) }
+
+      it "returns the first of September from that year" do
+        expect(result).to eq("1 9 #{calendar_year}")
+      end
+    end
+
+    context "when called with a date before April" do
+      calendar_year = 2040
+      let(:input) { Date.new(calendar_year, 2, 7) }
+
+      it "returns the first of September from the previous year" do
+        expect(result).to eq("1 9 #{calendar_year - 1}")
+      end
+    end
+  end
 end