Add feature specs for project labels search

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/labels/index.html.haml

@@ -18,7 +18,7 @@
           = _('Star a label to make it a priority label. Order the prioritized labels to change their relative priority, by dragging.')
 
     = form_tag project_labels_path(@project), method: :get do
-      = search_field_tag :search, params[:search], { placeholder: _('Filter labels by name or description'), class: 'form-control', spellcheck: false }
+      = search_field_tag :search, params[:search], { placeholder: _('Filter labels by name or description'), id: 'label-search', class: 'form-control', spellcheck: false }
 
     .labels-container.prepend-top-10
       - if can_admin_label

spec/features/projects/labels/search_labels_spec.rb

+require 'spec_helper'
+
+describe 'Search for labels', :js do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let!(:label1) { create(:label, title: 'Foo', description: 'Lorem ipsum', project: project) }
+  let!(:label2) { create(:label, title: 'Bar', description: 'Fusce consequat', project: project) }
+
+  before do
+    project.add_maintainer(user)
+    sign_in(user)
+  end
+
+  it 'searches for label by title' do
+    visit project_labels_path(project)
+
+    fill_in 'label-search', with: 'Bar'
+    find('#label-search').native.send_keys(:enter)
+
+    expect(page).to have_content(label2.title)
+    expect(page).to have_content(label2.description)
+    expect(page).not_to have_content(label1.title)
+    expect(page).not_to have_content(label1.description)
+  end
+
+  it 'searches for label by title' do
+    visit project_labels_path(project)
+
+    fill_in 'label-search', with: 'Lorem'
+    find('#label-search').native.send_keys(:enter)
+
+    expect(page).to have_content(label1.title)
+    expect(page).to have_content(label1.description)
+    expect(page).not_to have_content(label2.title)
+    expect(page).not_to have_content(label2.description)
+  end
+end