Add hidden don't know options to soctenant and fromprop

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

@@ -12,5 +12,13 @@ class Form::Sales::Questions::BuyerPrevious < ::Form::Question
   ANSWER_OPTIONS = {
     "1" => { "value" => "Yes" },
     "2" => { "value" => "No" },
+    "0" => { "value" => "Don’t know" },
   }.freeze
+
+  def displayed_answer_options(_log, _user = nil)
+    {
+      "1" => { "value" => "Yes" },
+      "2" => { "value" => "No" },
+    }
+  end
 end

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

@@ -17,5 +17,16 @@ class Form::Sales::Questions::Fromprop < ::Form::Question
     "3" => { "value" => "House" },
     "4" => { "value" => "Bungalow" },
     "9" => { "value" => "Other" },
+    "0" => { "value" => "Don’t know" },
   }.freeze
+
+  def displayed_answer_options(_log, _user = nil)
+    {
+      "1" => { "value" => "Flat or maisonette" },
+      "2" => { "value" => "Bedsit" },
+      "3" => { "value" => "House" },
+      "4" => { "value" => "Bungalow" },
+      "9" => { "value" => "Other" },
+    }
+  end
 end

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

@@ -46,10 +46,18 @@ RSpec.describe Form::Sales::Questions::BuyerPrevious, type: :model do
     expect(question.derived?).to be false
   end
 
+  it "has the correct displayed_answer_options" do
+    expect(question.displayed_answer_options(nil)).to eq({
+      "1" => { "value" => "Yes" },
+      "2" => { "value" => "No" },
+    })
+  end
+
   it "has the correct answer_options" do
     expect(question.answer_options).to eq({
       "1" => { "value" => "Yes" },
       "2" => { "value" => "No" },
+      "0" => { "value" => "Don’t know" },
     })
   end
 

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

@@ -35,6 +35,16 @@ RSpec.describe Form::Sales::Questions::Fromprop, type: :model do
     expect(question.hint_text).to eq("")
   end
 
+  it "has the correct displayed_answer_options" do
+    expect(question.displayed_answer_options(nil)).to eq({
+      "1" => { "value" => "Flat or maisonette" },
+      "2" => { "value" => "Bedsit" },
+      "3" => { "value" => "House" },
+      "4" => { "value" => "Bungalow" },
+      "9" => { "value" => "Other" },
+    })
+  end
+
   it "has the correct answer_options" do
     expect(question.answer_options).to eq({
       "1" => { "value" => "Flat or maisonette" },
@@ -42,6 +52,7 @@ RSpec.describe Form::Sales::Questions::Fromprop, type: :model do
       "3" => { "value" => "House" },
       "4" => { "value" => "Bungalow" },
       "9" => { "value" => "Other" },
+      "0" => { "value" => "Don’t know" },
     })
   end
 end