CLDC-3163: Add hint text for joint purchase question from 2024 (#2175)

app/models/form/sales/questions/joint_purchase.rb

@@ -13,4 +13,10 @@ class Form::Sales::Questions::JointPurchase < ::Form::Question
     "1" => { "value" => "Yes" },
     "2" => { "value" => "No" },
   }.freeze
+
+  def hint_text
+    if form.start_year_after_2024?
+      "This is where two or more people are named as legal owners of the property after the purchase"
+    end
+  end
 end

spec/models/form/sales/questions/joint_purchase_spec.rb

@@ -6,6 +6,13 @@ RSpec.describe Form::Sales::Questions::JointPurchase, type: :model do
   let(:question_id) { nil }
   let(:question_definition) { nil }
   let(:page) { instance_double(Form::Page) }
+  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form) }
+
+  before do
+    allow(page).to receive(:subsection).and_return(subsection)
+    allow(subsection).to receive(:form).and_return(form)
+  end
 
   it "has correct page" do
     expect(question.page).to eq(page)
@@ -31,14 +38,30 @@ RSpec.describe Form::Sales::Questions::JointPurchase, type: :model do
     expect(question.derived?).to be false
   end
 
-  it "has the correct hint_text" do
-    expect(question.hint_text).to be_nil
-  end
-
   it "has the correct answer_options" do
     expect(question.answer_options).to eq({
       "1" => { "value" => "Yes" },
       "2" => { "value" => "No" },
     })
   end
+
+  context "with collection year before 2024" do
+    before do
+      allow(form).to receive(:start_year_after_2024?).and_return(false)
+    end
+
+    it "has the blank hint_text" do
+      expect(question.hint_text).to be_nil
+    end
+  end
+
+  context "with collection year >= 2024" do
+    before do
+      allow(form).to receive(:start_year_after_2024?).and_return(true)
+    end
+
+    it "has the correct hint_text" do
+      expect(question.hint_text).to eq("This is where two or more people are named as legal owners of the property after the purchase")
+    end
+  end
 end