update copy to handle pluralisation in the case of joint purchase for buyer previous, with associated testing changes

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

@@ -1,12 +1,13 @@
 class Form::Sales::Pages::BuyerPrevious < ::Form::Page
-  def initialize(id, hsh, subsection)
-    super
-    @id = "buyer_previous"
+  def initialize(id, hsh, subsection, joint_purchase:)
+    super(id, hsh, subsection)
+    @joint_purchase = joint_purchase
+    @depends_on = [{ "joint_purchase?" => joint_purchase }]
   end
 
   def questions
     @questions ||= [
-      Form::Sales::Questions::BuyerPrevious.new(nil, nil, self),
+      Form::Sales::Questions::BuyerPrevious.new(nil, nil, self, joint_purchase: @joint_purchase),
     ]
   end
 end

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

@@ -1,9 +1,9 @@
 class Form::Sales::Questions::BuyerPrevious < ::Form::Question
-  def initialize(id, hsh, page)
-    super
+  def initialize(id, hsh, page, joint_purchase:)
+    super(id, hsh, page)
     @id = "soctenant"
-    @check_answer_label = "Buyer was a registered provider, housing association or local authority tenant immediately before this sale?"
-    @header = "Was the buyer a private registered provider, housing association or local authority tenant immediately before this sale?"
+    @check_answer_label = "#{joint_purchase ? 'Any buyers were' : 'Buyer was a'} registered provider#{'s' if joint_purchase}, housing association or local authority tenant#{'s' if joint_purchase} immediately before this sale?"
+    @header = "#{joint_purchase ? 'Were any of the buyers' : 'Was the buyer a'} private registered provider#{'s' if joint_purchase}, housing association or local authority tenant#{'s' if joint_purchase} immediately before this sale?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
   end

app/models/form/sales/subsections/shared_ownership_scheme.rb

@@ -18,7 +18,8 @@ class Form::Sales::Subsections::SharedOwnershipScheme < ::Form::Subsection
       Form::Sales::Pages::HandoverDate.new(nil, nil, self),
       Form::Sales::Pages::HandoverDateCheck.new(nil, nil, self),
       Form::Sales::Pages::LaNominations.new(nil, nil, self),
-      Form::Sales::Pages::BuyerPrevious.new(nil, nil, self),
+      Form::Sales::Pages::BuyerPrevious.new("buyer_previous_joint_purchase", nil, self, joint_purchase: true),
+      Form::Sales::Pages::BuyerPrevious.new("buyer_previous_not_joint_purchase", nil, self, joint_purchase: false),
       Form::Sales::Pages::PreviousBedrooms.new(nil, nil, self),
       Form::Sales::Pages::PreviousPropertyType.new(nil, nil, self),
       Form::Sales::Pages::PreviousTenure.new(nil, nil, self),

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

@@ -1,11 +1,12 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Pages::BuyerPrevious, type: :model do
-  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+  subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase:) }
 
-  let(:page_id) { nil }
+  let(:page_id) { "example" }
   let(:page_definition) { nil }
   let(:subsection) { instance_double(Form::Subsection) }
+  let(:joint_purchase) { false }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
@@ -16,7 +17,7 @@ RSpec.describe Form::Sales::Pages::BuyerPrevious, type: :model do
   end
 
   it "has the correct id" do
-    expect(page.id).to eq("buyer_previous")
+    expect(page.id).to eq("example")
   end
 
   it "has the correct header" do
@@ -26,4 +27,18 @@ RSpec.describe Form::Sales::Pages::BuyerPrevious, type: :model do
   it "has the correct description" do
     expect(page.description).to be_nil
   end
+
+  context "when sales is a joint purchase" do
+    let(:joint_purchase) { true }
+
+    it "has the correct depends on" do
+      expect(page.depends_on).to eq([{ "joint_purchase?" => true }])
+    end
+  end
+
+  context "when sales is not a joint purchase" do
+    it "has the correct depends on" do
+      expect(page.depends_on).to eq([{ "joint_purchase?" => false }])
+    end
+  end
 end

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

@@ -1,11 +1,12 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Questions::BuyerPrevious, type: :model do
-  subject(:question) { described_class.new(question_id, question_definition, page) }
+  subject(:question) { described_class.new(question_id, question_definition, page, joint_purchase:) }
 
   let(:question_id) { nil }
   let(:question_definition) { nil }
   let(:page) { instance_double(Form::Page) }
+  let(:joint_purchase) { true }
 
   it "has correct page" do
     expect(question.page).to eq(page)
@@ -15,12 +16,26 @@ RSpec.describe Form::Sales::Questions::BuyerPrevious, type: :model do
     expect(question.id).to eq("soctenant")
   end
 
-  it "has the correct header" do
-    expect(question.header).to eq("Was the buyer a private registered provider, housing association or local authority tenant immediately before this sale?")
+  context "when a joint purchase" do
+    it "has the correct header" do
+      expect(question.header).to eq("Were any of the buyers private registered providers, housing association or local authority tenants immediately before this sale?")
+    end
+
+    it "has the correct check_answer_label" do
+      expect(question.check_answer_label).to eq("Any buyers were registered providers, housing association or local authority tenants immediately before this sale?")
+    end
   end
 
-  it "has the correct check_answer_label" do
-    expect(question.check_answer_label).to eq("Buyer was a registered provider, housing association or local authority tenant immediately before this sale?")
+  context "when not a joint purchase" do
+    let(:joint_purchase) { false }
+
+    it "has the correct header" do
+      expect(question.header).to eq("Was the buyer a private registered provider, housing association or local authority tenant immediately before this sale?")
+    end
+
+    it "has the correct check_answer_label" do
+      expect(question.check_answer_label).to eq("Buyer was a registered provider, housing association or local authority tenant immediately before this sale?")
+    end
   end
 
   it "has the correct type" do

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

@@ -24,7 +24,8 @@ RSpec.describe Form::Sales::Subsections::SharedOwnershipScheme, type: :model do
         handover_date
         handover_date_check
         la_nominations
-        buyer_previous
+        buyer_previous_joint_purchase
+        buyer_previous_not_joint_purchase
         previous_bedrooms
         previous_property_type
         shared_ownership_previous_tenure