CLDc-4174: add new page test

spec/models/form/sales/pages/service_charge_staircasing_spec.rb

@@ -0,0 +1,29 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::ServiceChargeStaircasing, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+
+  let(:page_id) { nil }
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection, form: instance_double(Form, start_date: Time.zone.local(2026, 4, 1))) }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has correct questions" do
+    expect(page.questions.map(&:id)).to eq(%w[has_mscharge mscharge])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq(nil)
+  end
+
+  it "has the correct description" do
+    expect(page.description).to be_nil
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to be_nil
+  end
+end