Add route `/new` under Test Cases

Adds route `/new` under Test Cases to show create
test case form.

ee/app/controllers/projects/quality/test_cases_controller.rb

 # frozen_string_literal: true
 
 class Projects::Quality::TestCasesController < Projects::ApplicationController
+  prepend_before_action :authenticate_user!, only: [:new]
+
   before_action :check_quality_management_available!
   before_action :authorize_read_issue!
   before_action :verify_test_cases_flag!
+  before_action :authorize_create_issue!, only: [:new]
+
   before_action do
     push_frontend_feature_flag(:quality_test_cases, project)
   end
@@ -14,6 +18,12 @@ class Projects::Quality::TestCasesController < Projects::ApplicationController
     end
   end
 
+  def new
+    respond_to do |format|
+      format.html
+    end
+  end
+
   private
 
   def verify_test_cases_flag!

ee/app/views/projects/quality/test_cases/new.html.haml

+- add_to_breadcrumbs _('Test Cases'), project_quality_test_cases_path(@project)
+
+- breadcrumb_title _('New')
+- page_title _('New Test Case')
+
+#js-create-test-case{ data: { project_full_path: @project.full_path,
+  project_test_cases_path: project_quality_test_cases_path(@project),
+  description_preview_path: preview_markdown_path(@project),
+  description_help_path: help_page_path('user/markdown'),
+  labels_manage_path: project_labels_path(@project),
+  labels_fetch_path: project_labels_path(@project, format: :json) } }

ee/config/routes/project.rb

@@ -16,7 +16,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
 
         namespace :quality do
-          resources :test_cases, only: [:index]
+          resources :test_cases, only: [:index, :new]
         end
 
         resources :autocomplete_sources, only: [] do

ee/spec/controllers/projects/quality/test_cases_controller_spec.rb

@@ -6,9 +6,7 @@ RSpec.describe Projects::Quality::TestCasesController do
   let_it_be(:project) { create(:project) }
   let_it_be(:user) { create(:user) }
 
-  subject { get :index, params: { namespace_id: project.namespace, project_id: project } }
-
-  describe 'GET #index' do
+  shared_examples_for 'test case action' do |template|
     context 'with authorized user' do
       before do
         project.add_developer(user)
@@ -20,11 +18,11 @@ RSpec.describe Projects::Quality::TestCasesController do
           stub_licensed_features(quality_management: true)
         end
 
-        it 'renders the index template' do
+        it 'renders the template' do
           subject
 
           expect(response).to have_gitlab_http_status(:ok)
-          expect(response).to render_template(:index)
+          expect(response).to render_template(template)
         end
 
         context 'when quality_test_cases flag is disabled' do
@@ -80,4 +78,18 @@ RSpec.describe Projects::Quality::TestCasesController do
       end
     end
   end
+
+  describe 'GET' do
+    describe '#index' do
+      subject { get :index, params: { namespace_id: project.namespace, project_id: project } }
+
+      it_behaves_like 'test case action', :index
+    end
+
+    describe '#new' do
+      subject { get :new, params: { namespace_id: project.namespace, project_id: project } }
+
+      it_behaves_like 'test case action', :new
+    end
+  end
 end