add error count to bulk upload results

app/views/bulk_upload_lettings_results/show.html.erb

@@ -1,7 +1,7 @@
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds">
     <span class="govuk-caption-l">Bulk Upload for lettings (<%= @bulk_upload.year_combo %>)</span>
-    <h1 class="govuk-heading-l">We found X errors in your file</h1>
+    <h1 class="govuk-heading-l">We found <%= pluralize(@bulk_upload.bulk_upload_errors.count, "error") %> in your file</h1>
 
     <div class="govuk-body">
       Here’s a list of everything that you need to fix your spreadsheet. You can download the specification to help you fix the cells in your CSV file.

spec/requests/bulk_upload_lettings_results_controller_spec.rb

@@ -0,0 +1,27 @@
+require "rails_helper"
+
+RSpec.describe BulkUploadLettingsResultsController, type: :request do
+  let(:user) { create(:user) }
+  let(:bulk_upload) { create(:bulk_upload, user:, bulk_upload_errors:) }
+  let(:bulk_upload_errors) { create_list(:bulk_upload_error, 2) }
+
+  before do
+    sign_in user
+  end
+
+  describe "GET /lettings-logs/bulk-upload-results/:ID" do
+    it "renders correct year" do
+      get "/lettings-logs/bulk-upload-results/#{bulk_upload.id}"
+
+      expect(response).to be_successful
+      expect(response.body).to include("Bulk Upload for lettings (2022/23)")
+    end
+
+    it "renders correct number of errors" do
+      get "/lettings-logs/bulk-upload-results/#{bulk_upload.id}"
+
+      expect(response).to be_successful
+      expect(response.body).to include("We found 2 errors in your file")
+    end
+  end
+end