test: add tests for Server model

spec/models/organization_spec.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Organization do
+  context "model" do
+    subject(:organization) { create(:organization) }
+
+    it "should have a UUID" do
+      expect(organization.uuid).to be_a String
+      expect(organization.uuid.length).to eq 36
+    end
+  end
+end