Pending example models minimal coverage (#23912)

spec/models/domain_allow_spec.rb

@@ -2,6 +2,17 @@
 
 require 'rails_helper'
 
-RSpec.describe DomainAllow, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+describe DomainAllow do
+  describe 'scopes' do
+    describe 'matches_domain' do
+      let(:domain) { Fabricate(:domain_allow, domain: 'example.com') }
+      let(:other_domain) { Fabricate(:domain_allow, domain: 'example.biz') }
+
+      it 'returns the correct records' do
+        results = described_class.matches_domain('example.com')
+
+        expect(results).to eq([domain])
+      end
+    end
+  end
 end