Add additional model and integration tests

This commit adds new tests for a better coverage.

integration/
  * home
  * supplier

models/
  * article
  * delivery
  * group_order_article
  * supplier

also adds a new factory for delivery

Co-authored-by: viehlieb <pf@pragma-shift.net>
Co-authored-by: Tobias Kneuker <tk@pragma-shift.net>

spec/integration/home_spec.rb

@@ -0,0 +1,23 @@
+require_relative '../spec_helper'
+
+feature 'my profile page' do
+  let(:user) { create :user }
+
+  before { login user }
+
+  describe 'my profile' do
+    before { visit my_profile_path }
+
+    it 'is accessible' do
+      expect(page).to have_field 'user_first_name'
+      expect(find_field('user_first_name').value).to eq user.first_name
+    end
+
+    it 'updates first name' do
+      fill_in 'user_first_name', with: 'foo'
+      click_button I18n.t('ui.save')
+      expect(User.find(user.id).first_name).to eq 'foo'
+      expect(page).to have_selector '.alert-success'
+    end
+  end
+end