CLDC-4174: add subsection spec

spec/models/form/sales/subsections/shared_ownership_staircasing_transaction_spec.rb

@@ -0,0 +1,85 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Subsections::SharedOwnershipStaircasingTransaction, type: :model do
+  subject(:shared_ownership_staircasing_transaction) { described_class.new(nil, nil, section) }
+
+  let(:form) { instance_double(Form, start_year_2026_or_later?: false) }
+  let(:section) { instance_double(Form::Sales::Sections::SaleInformation, form:) }
+
+  it "has correct section" do
+    expect(shared_ownership_staircasing_transaction.section).to eq(section)
+  end
+
+  it "has the correct depends_on" do
+    expect(shared_ownership_staircasing_transaction.depends_on).to eq([{ "ownershipsch" => 1, "setup_completed?" => true, "staircase" => 1 }])
+  end
+
+  it "has the correct id" do
+    expect(shared_ownership_staircasing_transaction.id).to eq("shared_ownership_staircasing_transaction")
+  end
+
+  it "has the correct label" do
+    expect(shared_ownership_staircasing_transaction.label).to eq("Shared ownership - staircasing transaction")
+  end
+
+  it "has the correct copy key" do
+    expect(shared_ownership_staircasing_transaction.copy_key).to eq("sale_information")
+  end
+
+  context "when the start year is 2025" do
+    let(:form) { instance_double(Form, start_year_2025_or_later?: true, start_year_2026_or_later?: false, start_date: Time.utc(2025, 4, 1)) }
+
+    it "has correct pages" do
+      expect(shared_ownership_staircasing_transaction.pages.map(&:id)).to eq(
+        %w[
+          about_staircasing_joint_purchase
+          about_staircasing_not_joint_purchase
+          staircase_sale
+          staircase_bought_value_check
+          staircase_owned_value_check_joint_purchase
+          staircase_owned_value_check_not_joint_purchase
+          staircase_first_time
+          staircase_previous
+          staircase_initial_date
+          value_shared_ownership_staircase
+          about_price_shared_ownership_value_check_staircasing
+          staircase_equity
+          shared_ownership_equity_value_check_staircasing
+          staircase_mortgage_used_shared_ownership
+          monthly_rent_staircasing_owned
+          monthly_rent_staircasing
+          monthly_charges_shared_ownership_value_check
+        ],
+      )
+    end
+  end
+
+  context "when the start year is 2026" do
+    let(:form) { instance_double(Form, start_year_2025_or_later?: true, start_year_2026_or_later?: true, start_date: Time.utc(2026, 4, 1)) }
+
+    it "has correct pages" do
+      expect(shared_ownership_staircasing_transaction.pages.map(&:id)).to eq(
+        %w[
+          about_staircasing_joint_purchase
+          about_staircasing_not_joint_purchase
+          staircase_sale
+          staircase_bought_value_check
+          staircase_owned_value_check_joint_purchase
+          staircase_owned_value_check_not_joint_purchase
+          staircase_first_time
+          staircase_previous
+          staircase_initial_date
+          value_shared_ownership_staircase
+          about_price_shared_ownership_value_check_staircasing
+          staircase_equity
+          shared_ownership_equity_value_check_staircasing
+          staircase_mortgage_used_shared_ownership
+          monthly_rent_staircasing_owned
+          monthly_rent_staircasing
+          service_charge_staircasing
+          monthly_charges_shared_ownership_value_check
+        ],
+      )
+    end
+  end
+end