Reset depenent answers

If the user has changed the application route we want to re ask the
state_funded_secondary_school question.

app/forms/journeys/get_a_teacher_relocation_payment/application_route_form.rb

@@ -15,12 +15,24 @@ def available_options
       def save
         return false unless valid?
 
+        if application_route_changed?
+          journey_session.answers.assign_attributes(
+            state_funded_secondary_school: nil
+          )
+        end
+
         journey_session.answers.assign_attributes(
           application_route: application_route
         )
 
         journey_session.save!
       end
+
+      private
+
+      def application_route_changed?
+        journey_session.answers.application_route != application_route
+      end
     end
   end
 end

app/views/get_a_teacher_relocation_payment/claims/trainee_details.html.erb

@@ -23,7 +23,7 @@
         -> (option) { option },
         -> (option) { t("get_a_teacher_relocation_payment.forms.trainee_details.answers.#{option}.answer") },
         legend: { text: t("get_a_teacher_relocation_payment.forms.trainee_details.question") },
-        hint: { html: t("get_a_teacher_relocation_payment.forms.trainee_details.hint_html") }
+        hint: { text: t("get_a_teacher_relocation_payment.forms.trainee_details.hint_html") }
       ) %>
 
       <%= f.govuk_submit %>

spec/forms/journeys/get_a_teacher_relocation_payment/application_route_form_spec.rb

@@ -37,5 +37,37 @@
         change { journey_session.reload.answers.application_route }.to("teacher")
       )
     end
+
+    describe "reseting dependent answers" do
+      before do
+        journey_session.answers.assign_attributes(
+          application_route: existing_option,
+          state_funded_secondary_school: true
+        )
+        journey_session.save!
+      end
+
+      context "when the value has changed" do
+        let(:existing_option) { "salaried_trainee" }
+
+        it "resets dependent answers" do
+          expect { expect(form.save).to be(true) }.to(
+            change { journey_session.reload.answers.state_funded_secondary_school }
+            .from(true)
+            .to(nil)
+          )
+        end
+      end
+
+      context "when the value hasn't changed" do
+        let(:existing_option) { option }
+
+        it "doesn't reset dependent answers if the value hasn't changed" do
+          expect { expect(form.save).to be(true) }.not_to(
+            change { journey_session.reload.answers.state_funded_secondary_school }
+          )
+        end
+      end
+    end
   end
 end