Add ApplicationFormNameForm

This is a form which uses the new UpdateApplicationFormName service to
allow assessors to change the name on an application form.

app/forms/assessor_interface/application_form_name_form.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class AssessorInterface::ApplicationFormNameForm
+  include ActiveModel::Model
+  include ActiveModel::Attributes
+
+  attr_accessor :application_form, :user
+  attribute :given_names, :string
+  attribute :family_name, :string
+
+  validates :application_form, :user, presence: true
+
+  def save
+    return false if invalid?
+
+    UpdateApplicationFormName.call(
+      application_form:,
+      user:,
+      given_names:,
+      family_name:,
+    )
+
+    true
+  end
+end

config/locales/helpers.en.yml

@@ -2,6 +2,9 @@ en:
   helpers:
     caption: {}
     hint:
+      assessor_interface_application_form_name_form:
+        given_names: Type the updated given names in the text box below
+        family_name: Type the updated family name in the text box below
       assessor_interface_assessment_section_form:
         selected_failure_reasons: Select all options that are relevant to you.
         failure_reason_notes:
@@ -58,6 +61,9 @@ en:
         start_date: For example, 3 2020, If you cannot remember the exact month or year, enter an estimate.
         end_date: For example, 3 2020, If you cannot remember the exact month or year, enter an estimate.
     label:
+      assessor_interface_application_form_name_form:
+        given_names: Change given names
+        family_name: Change family name
       assessor_interface_assessment_recommendation_form:
         recommendation_options:
           award: Award QTS

spec/forms/assessor_interface/application_form_name_form_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe AssessorInterface::ApplicationFormNameForm, type: :model do
+  let(:application_form) { create(:application_form) }
+  let(:user) { create(:staff) }
+
+  let(:given_names) { "A new given name" }
+  let(:family_name) { "A new family name" }
+
+  subject(:form) do
+    described_class.new(application_form:, user:, given_names:, family_name:)
+  end
+
+  describe "validations" do
+    it { is_expected.to validate_presence_of(:application_form) }
+    it { is_expected.to validate_presence_of(:user) }
+  end
+
+  describe "#save" do
+    subject(:save) { form.save }
+
+    it "calls the UpdateApplicationFormName service" do
+      expect(UpdateApplicationFormName).to receive(:call).with(
+        application_form:,
+        user:,
+        given_names:,
+        family_name:,
+      )
+      expect(save).to be true
+    end
+  end
+end