Render snippet blob filename in dashboard

When Snippets are versioned we should display the correct
filename in the dashboard list

app/helpers/snippets_helper.rb

@@ -160,4 +160,14 @@ module SnippetsHelper
             title: 'Download',
             rel: 'noopener noreferrer')
   end
+
+  def snippet_file_name(snippet)
+    blob = if Feature.enabled?(:version_snippets, current_user) && !snippet.repository.empty?
+             snippet.blobs.first
+           else
+             snippet.blob
+           end
+
+    blob.name
+  end
 end

app/views/shared/snippets/_snippet.html.haml

 - link_project = local_assigns.fetch(:link_project, false)
 - notes_count = @noteable_meta_data[snippet.id].user_notes_count
+- file_name = snippet_file_name(snippet)
 
 %li.snippet-row.py-3
   = image_tag avatar_icon_for_user(snippet.author), class: "avatar s40 d-none d-sm-block", alt: ''
@@ -7,10 +8,10 @@
   .title
     = link_to gitlab_snippet_path(snippet) do
       = snippet.title
-    - if snippet.file_name.present?
+    - if file_name.present?
       %span.snippet-filename.d-none.d-sm-inline-block.ml-2
         = sprite_icon('doc-code', size: 16, css_class: 'file-icon align-text-bottom')
-        = snippet.file_name
+        = file_name
 
     %ul.controls
       %li

spec/features/dashboard/snippets_spec.rb

@@ -3,8 +3,10 @@
 require 'spec_helper'
 
 describe 'Dashboard snippets' do
+  let_it_be(:user) { create(:user) }
+
   context 'when the project has snippets' do
-    let(:project) { create(:project, :public) }
+    let(:project) { create(:project, :public, creator: user) }
     let!(:snippets) { create_list(:project_snippet, 2, :public, author: project.owner, project: project) }
 
     before do
@@ -22,7 +24,7 @@ describe 'Dashboard snippets' do
   end
 
   context 'when there are no project snippets', :js do
-    let(:project) { create(:project, :public) }
+    let(:project) { create(:project, :public, creator: user) }
 
     before do
       sign_in(project.owner)
@@ -47,9 +49,49 @@ describe 'Dashboard snippets' do
     end
   end
 
+  context 'rendering file names' do
+    let_it_be(:snippet) { create(:personal_snippet, :public, author: user, file_name: 'foo.txt') }
+    let_it_be(:versioned_snippet) { create(:personal_snippet, :repository, :public, author: user, file_name: 'bar.txt') }
+
+    before do
+      sign_in(user)
+    end
+
+    context 'when feature flag :version_snippets is disabled' do
+      before do
+        stub_feature_flags(version_snippets: false)
+
+        visit dashboard_snippets_path
+      end
+
+      it 'contains the snippet file names from the DB' do
+        aggregate_failures do
+          expect(page).to have_content 'foo.txt'
+          expect(page).to have_content('bar.txt')
+          expect(page).not_to have_content('.gitattributes')
+        end
+      end
+    end
+
+    context 'when feature flag :version_snippets is enabled' do
+      before do
+        stub_feature_flags(version_snippets: true)
+
+        visit dashboard_snippets_path
+      end
+
+      it 'contains both the versioned and non-versioned filenames' do
+        aggregate_failures do
+          expect(page).to have_content 'foo.txt'
+          expect(page).to have_content('.gitattributes')
+          expect(page).not_to have_content('bar.txt')
+        end
+      end
+    end
+  end
+
   context 'filtering by visibility' do
-    let(:user) { create(:user) }
-    let!(:snippets) do
+    let_it_be(:snippets) do
       [
         create(:personal_snippet, :public, author: user),
         create(:personal_snippet, :internal, author: user),
@@ -99,7 +141,7 @@ describe 'Dashboard snippets' do
   end
 
   context 'as an external user' do
-    let(:user) { create(:user, :external) }
+    let_it_be(:user) { create(:user, :external) }
 
     before do
       sign_in(user)

spec/helpers/snippets_helper_spec.rb

@@ -151,4 +151,35 @@ describe SnippetsHelper do
       "<input type=\"text\" readonly=\"readonly\" class=\"js-snippet-url-area snippet-embed-input form-control\" data-url=\"#{url}\" value=\"<script src=&quot;#{url}.js&quot;></script>\" autocomplete=\"off\"></input>"
     end
   end
+
+  describe '#snippet_file_name' do
+    subject { helper.snippet_file_name(snippet) }
+
+    where(:snippet_type, :flag_enabled, :trait, :filename) do
+      [
+        [:personal_snippet, false, nil,         'foo.txt'],
+        [:personal_snippet, true,  nil,         'foo.txt'],
+        [:personal_snippet, false, :repository, 'foo.txt'],
+        [:personal_snippet, true,  :repository, '.gitattributes'],
+
+        [:project_snippet,  false, nil,         'foo.txt'],
+        [:project_snippet,  true,  nil,         'foo.txt'],
+        [:project_snippet,  false, :repository, 'foo.txt'],
+        [:project_snippet,  true,  :repository, '.gitattributes']
+      ]
+    end
+
+    with_them do
+      let(:snippet) { create(snippet_type, trait, file_name: 'foo.txt') }
+
+      before do
+        allow(helper).to receive(:current_user).and_return(snippet.author)
+        stub_feature_flags(version_snippets: flag_enabled)
+      end
+
+      it 'returns the correct filename' do
+        expect(subject).to eq filename
+      end
+    end
+  end
 end