LG-8577: Prefill user's mobile number for hybrid docauth

app/services/idv/steps/send_link_step.rb

@@ -28,8 +28,22 @@ def call
         build_telephony_form_response(telephony_result)
       end
 
+      def extra_view_variables
+        {
+          idv_phone_form: build_form,
+        }
+      end
+
       private
 
+      def build_form
+        Idv::PhoneForm.new(
+          previous_params: {},
+          user: current_user,
+          delivery_methods: [:sms],
+        )
+      end
+
       def build_telephony_form_response(telephony_result)
         FormResponse.new(
           success: telephony_result.success?,
@@ -76,11 +90,7 @@ def sp_or_app_name
       def form_submit
         params = permit(:phone)
         params[:otp_delivery_preference] = 'sms'
-        Idv::PhoneForm.new(
-          previous_params: {},
-          user: current_user,
-          delivery_methods: [:sms],
-        ).submit(params)
+        build_form.submit(params)
       end
 
       def formatted_destination_phone

app/views/idv/doc_auth/send_link.html.erb

@@ -16,7 +16,8 @@
 
 <p><%= t('doc_auth.instructions.send_sms') %></p>
 <%= simple_form_for(
-      :doc_auth,
+      idv_phone_form,
+      as: :doc_auth,
       url: url_for,
       method: 'PUT',
       html: { autocomplete: 'off' },

spec/features/idv/doc_auth/send_link_step_spec.rb

@@ -18,6 +18,11 @@
   let(:fake_analytics) { FakeAnalytics.new }
   let(:fake_attempts_tracker) { IrsAttemptsApiTrackingHelper::FakeAttemptsTracker.new }
 
+  it "defaults phone to user's 2fa phone numebr" do
+    field = page.find_field(t('two_factor_authentication.phone_label'))
+    expect(field.value).to eq('+1 202-555-1212')
+  end
+
   it 'proceeds to the next page with valid info' do
     expect_any_instance_of(IrsAttemptsApi::Tracker).to receive(:track_event).with(
       :idv_phone_upload_link_sent,

spec/services/idv/steps/send_link_step_spec.rb

@@ -68,6 +68,16 @@
       and_return(irs_attempts_api_tracker)
   end
 
+  describe '#extra_view_variables' do
+    it 'includes form' do
+      expect(step.extra_view_variables).to include(
+        {
+          idv_phone_form: be_an_instance_of(Idv::PhoneForm),
+        },
+      )
+    end
+  end
+
   describe 'the return value from #call' do
     let(:response) { step.call }