Add exchange date page and question

app/models/form/sales/pages/exchange_date.rb

@@ -0,0 +1,18 @@
+class Form::Sales::Pages::ExchangeDate < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "exchange_contracts"
+    @header = ""
+    @description = ""
+    @subsection = subsection
+    @depends_on = [{
+      "resale" => 2
+    }]
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::ExchangeDate.new(nil, nil, self),
+    ]
+  end
+end

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

@@ -0,0 +1,10 @@
+class Form::Sales::Questions::ExchangeDate < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "exdate"
+    @check_answer_label = "Exchange of contracts date"
+    @header = "What is the exchange of contracts date?"
+    @type = "date"
+    @page = page
+  end
+end

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

@@ -0,0 +1,35 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::ExchangeDate, 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) }
+
+  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[exdate])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("exchange_contracts")
+  end
+
+  it "has the correct header" do
+    expect(page.header).to eq("")
+  end
+
+  it "has the correct description" do
+    expect(page.description).to eq("")
+  end
+
+  it "has the correct depends_on" do
+    expect(page.depends_on).to eq([{
+      "resale" => 2
+    }])
+  end
+end

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

@@ -0,0 +1,33 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Questions::ExchangeDate, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page) }
+
+  let(:question_id) { nil }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("exdate")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("What is the exchange of contracts date?")
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("Exchange of contracts date")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("date")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+end