EY find reference form keeps params in URL

- this means if the user causes a validation error we are able to
  maintain state of the email address

app/views/early_years_payment/practitioner/claims/find_reference.html.erb

@@ -2,7 +2,7 @@
 
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds">
-    <%= form_with model: @form, url: claim_path(current_journey_routing_name), method: :patch, builder: GOVUKDesignSystemFormBuilder::FormBuilder, html: { novalidate: false } do |f| %>
+    <%= form_with model: @form, url: claim_path(current_journey_routing_name, request.query_parameters), method: :patch, builder: GOVUKDesignSystemFormBuilder::FormBuilder, html: { novalidate: false } do |f| %>
       <%= f.govuk_error_summary %>
 
       <%= f.hidden_field :email, value: params[:email] %>

spec/features/early_years_payment/practitioner/find_reference_spec.rb

@@ -20,4 +20,19 @@
 
     expect(page).to have_content "Track your application"
   end
+
+  scenario "after multiple attempts should work" do
+    when_early_years_payment_practitioner_journey_configuration_exists
+
+    visit "/early-years-payment-practitioner/find-reference?skip_landing_page=true&[email protected]"
+    expect(page).to have_content "Track your application"
+    fill_in "Claim reference number", with: "foo"
+    click_button "Submit"
+
+    expect(page).to have_content "Track your application"
+    fill_in "Claim reference number", with: claim.reference
+    click_button "Submit"
+
+    expect(page).to have_content "login page goes here"
+  end
 end