Add view tests to pipeline subscriptions view

ee/spec/views/projects/settings/subscriptions/_index.html.haml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'projects/settings/subscriptions/_index.html.haml' do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project, :public, :repository) }
+  let_it_be(:upstream_project) { create(:project, :public, :repository) }
+  let_it_be(:downstream_project) { create(:project, :public, :repository, upstream_projects: [project]) }
+
+  before do
+    allow(view).to receive(:current_user).and_return(user)
+    assign(:project, project)
+  end
+
+  it 'has a help link' do
+    render
+    expect(rendered).to have_css("a[href^='/help'][href$='#trigger-a-pipeline-when-an-upstream-project-is-rebuilt']")
+  end
+
+  context 'when project has upstream subscription' do
+    before do
+      assign(:project, downstream_project)
+    end
+
+    it 'has delete button' do
+      render
+      expect(rendered).to have_selector('[data-testid="delete-subscription"].btn-danger')
+    end
+  end
+
+  context 'when project has downstream subscription' do
+    it 'has no delete button' do
+      render
+      expect(rendered).not_to have_content('No project subscribes to the pipelines in this project.')
+      expect(rendered).not_to have_selector('[data-testid="delete-subscription"].btn-danger')
+    end
+  end
+end