CLDC-1850 add don't know option to buyer 1 previous tenure (#1345)

* add don't know option to buyer 1 previous tenure

* some minor tidying and reformatiing

app/models/form/sales/questions/buyer1_previous_tenure.rb

@@ -5,10 +5,11 @@ class Form::Sales::Questions::Buyer1PreviousTenure < ::Form::Question
     @check_answer_label = "Buyer 1’s previous tenure"
     @header = "What was buyer 1’s previous tenure?"
     @type = "radio"
-    @answer_options = ANSWER_OPTIONS
+    @answer_options = answer_options
   end
 
-  ANSWER_OPTIONS = {
+  def answer_options
+    {
       "1" => { "value" => "Local Authority" },
       "2" => { "value" => "Private registered provider or housing association tenant" },
       "3" => { "value" => "Private tenant" },
@@ -17,5 +18,7 @@ class Form::Sales::Questions::Buyer1PreviousTenure < ::Form::Question
       "6" => { "value" => "Living with family or friends" },
       "7" => { "value" => "Temporary accomodation" },
       "9" => { "value" => "Other" },
-  }.freeze
+      "0" => { "value" => "Don’t know" },
+    }
+  end
 end

spec/models/form/sales/pages/buyer1_previous_tenure_spec.rb

@@ -1,10 +1,8 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Pages::Buyer1PreviousTenure, type: :model do
-  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+  subject(:page) { described_class.new(nil, nil, subsection) }
 
-  let(:page_id) { nil }
-  let(:page_definition) { nil }
   let(:subsection) { instance_double(Form::Subsection) }
 
   it "has correct subsection" do

spec/models/form/sales/questions/buyer1_previous_tenure_spec.rb

@@ -1,10 +1,8 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Questions::Buyer1PreviousTenure, type: :model do
-  subject(:question) { described_class.new(question_id, question_definition, page) }
+  subject(:question) { described_class.new(nil, nil, page) }
 
-  let(:question_id) { nil }
-  let(:question_definition) { nil }
   let(:page) { instance_double(Form::Page) }
   let(:log) { create(:sales_log) }
 
@@ -42,6 +40,7 @@ RSpec.describe Form::Sales::Questions::Buyer1PreviousTenure, type: :model do
       "6" => { "value" => "Living with family or friends" },
       "7" => { "value" => "Temporary accomodation" },
       "9" => { "value" => "Other" },
+      "0" => { "value" => "Don’t know" },
     })
   end
 end