model and policy specs

spec/models/codeharbor_link_spec.rb

@@ -0,0 +1,16 @@
+require 'rails_helper'
+
+describe CodeharborLink do
+  it { is_expected.to validate_presence_of(:check_uuid_url) }
+  it { is_expected.to validate_presence_of(:push_url) }
+  it { is_expected.to validate_presence_of(:api_key) }
+  it { is_expected.to belong_to(:user) }
+
+  describe '#to_s' do
+    subject { codeharbor_link.to_s }
+
+    let(:codeharbor_link) { FactoryBot.create(:codeharbor_link) }
+
+    it { is_expected.to eql codeharbor_link.id.to_s }
+  end
+end