Add DashboardOperationsProjectEntity spec

ee/spec/serializers/dashboard_operations_project_entity_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe DashboardOperationsProjectEntity do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :repository) }
+  let(:resource) { Dashboard::Operations::ListService::DashboardProject.new(project, nil, 0, nil) }
+  let(:request) { double('request', current_user: user) }
+
+  subject { described_class.new(resource, request: request).as_json }
+
+  it 'has all required fields' do
+    expect(subject).to include(:remove_path, :alert_count)
+    expect(subject.first).to include(:id)
+  end
+end