Add test for pipeline subscriptions

Add test coverage for the pipeline
subscriptions feature. Add id to
the pipeline subscription form.

ee/app/views/projects/settings/subscriptions/_index.html.haml

 .row.prepend-top-default.append-bottom-default
   .col-lg-12
-    = form_for project_subscriptions_path(@project), method: :post, authenticity_token: true do |f|
+    = form_with url: project_subscriptions_path(@project), id: 'pipeline-subscriptions-form', method: :post, authenticity_token: true do |f|
       %fieldset
         .form-group
-          = f.label :upstream_project_id do
+          = f.label :upstream_project_path do
             = _("Project path")
-          = f.text_field :upstream_project_id, class: "form-control"
+          = f.text_field :upstream_project_path, class: "form-control"
         = f.submit _('Subscribe'), class: "btn btn-success float-right"
 
 .row.prepend-top-default.append-bottom-default

ee/app/views/projects/settings/subscriptions/_project.html.haml

@@ -2,5 +2,5 @@
   %td
     = project.name
   %td
-    = user_avatar_without_link(user: project.user, size: 32)
-    = project.user.name
+    = user_avatar_without_link(user: project.owner, size: 32)
+    = project.owner.name

ee/spec/features/projects/settings/pipeline_subscriptions_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Project Subscriptions', :js do
+  let(:project) { create(:project, :public, :repository) }
+  let(:upstream_project) { create(:project, :public, :repository) }
+  let(:user) { create(:user) }
+
+  before do
+    project.add_maintainer(user)
+    upstream_project.add_maintainer(user)
+
+    stub_licensed_features(ci_project_subscriptions: true)
+
+    sign_in(user)
+    visit project_settings_ci_cd_path(project)
+  end
+
+  it 'renders the correct path for the form action' do
+    within '#pipeline-subscriptions' do
+      form_action = find('#pipeline-subscriptions-form')['action']
+
+      expect(form_action).to end_with("/#{project.full_path}/-/subscriptions")
+    end
+  end
+
+  it 'successfully creates new pipeline subscription' do
+    within '#pipeline-subscriptions' do
+      within 'form' do
+        fill_in 'upstream_project_path', with: upstream_project.full_path
+
+        click_on 'Subscribe'
+      end
+
+      expect(find('.badge-pill').text).to eq '1'
+
+      expect(page).to have_content(upstream_project.name)
+      expect(page).to have_content(upstream_project.owner.name)
+    end
+
+    expect(page).to have_content('Subscription successfully created.')
+  end
+
+  it 'shows flash warning when unsuccesful in creating a pipeline subscription' do
+    within '#pipeline-subscriptions' do
+      within 'form' do
+        fill_in 'upstream_project_path', with: 'wrong/path'
+
+        click_on 'Subscribe'
+      end
+
+      expect(find('.badge-pill').text).to eq '0'
+      expect(all('tbody tr').count).to eq(0)
+    end
+
+    expect(page).to have_content('This project path either does not exist or you do not have access.')
+  end
+end