Add feature specs for On-demand scans

This adds new feature specs for DAST
On-demand scans testing out the happy path

ee/app/assets/javascripts/on_demand_scans/components/on_demand_scans_form.vue

@@ -412,6 +412,7 @@ export default {
           class="mw-460"
           data-testid="dast-scan-description-input"
           :placeholder="s__(`OnDemandScans|For example: Tests the login page for SQL injections`)"
+          name="description"
           :state="form.fields.description.state"
         />
       </gl-form-group>

ee/spec/features/projects/security/user_creates_on_demand_scan_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'User creates On-demand Scan' do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:dast_site_profile) { create(:dast_site_profile, project: project) }
+  let_it_be(:dast_scanner_profile) { create(:dast_scanner_profile, project: project) }
+
+  let(:profile_library_path) { project_security_configuration_dast_scans_path(project) }
+
+  before_all do
+    project.add_developer(user)
+  end
+
+  before do
+    sign_in(user)
+  end
+
+  context 'when feature is available' do
+    before do
+      stub_licensed_features(security_on_demand_scans: true)
+      visit(new_project_on_demand_scan_path(project))
+    end
+
+    it 'shows new scan page', :aggregate_failures, :js do
+      expect(page).to have_content 'New on-demand DAST scan'
+      expect(page).to have_link 'Manage DAST scans'
+      expect(page).to have_button 'Save and run scan'
+      expect(page).to have_button 'Save scan'
+    end
+
+    it 'on save', :js do
+      fill_in_form
+
+      click_button 'Save scan'
+      wait_for_requests
+
+      expect(current_path).to eq(profile_library_path)
+    end
+
+    it 'on cancel', :js do
+      click_button 'Cancel'
+      expect(current_path).to eq(profile_library_path)
+    end
+  end
+
+  context 'when feature is not available' do
+    before do
+      visit(new_project_on_demand_scan_path(project))
+    end
+
+    it 'renders a 404' do
+      expect(page).to have_gitlab_http_status(:not_found)
+    end
+  end
+
+  def fill_in_form
+    fill_in 'name', with: "My scan"
+    fill_in 'description', with: "This is the description"
+  end
+end