diff --git a/Gemfile b/Gemfile
index cdbb8ab..5eb981a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,9 +24,10 @@ gem 'rubytree'
 group :development, :test do
   gem 'debug', platforms: %i[mri windows]
   gem 'factory_bot_rails'
+  gem 'license_finder'
   gem 'pry'
   gem 'rspec-rails', '~> 7.0.0'
-  gem 'license_finder'
+  gem 'shoulda-matchers', '~> 6.0'
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index a1ac3c1..09646a4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -289,6 +289,8 @@ GEM
       json (~> 2.0, > 2.3.1)
     rubyzip (2.3.2)
     securerandom (0.3.1)
+    shoulda-matchers (6.4.0)
+      activesupport (>= 5.2.0)
     solid_queue (1.0.1)
       activejob (>= 7.1)
       activerecord (>= 7.1)
@@ -361,6 +363,7 @@ DEPENDENCIES
   rspec-rails (~> 7.0.0)
   rubocop
   rubytree
+  shoulda-matchers (~> 6.0)
   solid_queue (~> 1.0)
   sprockets-rails
   stimulus-rails
diff --git a/app/models/guest.rb b/app/models/guest.rb
index 87680bf..774eee3 100644
--- a/app/models/guest.rb
+++ b/app/models/guest.rb
@@ -3,7 +3,7 @@
 class Guest < ApplicationRecord
   belongs_to :group
 
-  enum status: {
+  enum :status, {
     considered: 0,
     invited: 10,
     confirmed: 20,
diff --git a/spec/models/guest_spec.rb b/spec/models/guest_spec.rb
index 1d3e530..6861079 100644
--- a/spec/models/guest_spec.rb
+++ b/spec/models/guest_spec.rb
@@ -3,5 +3,37 @@
 require 'rails_helper'
 
 RSpec.describe Guest, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it do
+    should define_enum_for(:status).with_values(
+      considered: 0,
+      invited: 10,
+      confirmed: 20,
+      declined: 30,
+      tentative: 40
+    )
+  end
+
+  it { should belong_to(:group) }
+
+  describe 'scopes' do
+    describe '.potential' do
+      it 'returns guests that are not declined or considered' do
+        _declined_guest = create(:guest, status: :declined)
+        _considered_guest = create(:guest, status: :considered)
+        invited_guest = create(:guest, status: :invited)
+        confirmed_guest = create(:guest, status: :confirmed)
+        tentative_guest = create(:guest, status: :tentative)
+
+        expect(Guest.potential).to match_array([invited_guest, confirmed_guest, tentative_guest])
+      end
+    end
+  end
+
+  describe '#full_name' do
+    it 'returns the full name of the guest' do
+      guest = create(:guest, first_name: 'John', last_name: 'Doe')
+
+      expect(guest.full_name).to eq('John Doe')
+    end
+  end
 end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 233f83a..fa81db3 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -66,3 +66,10 @@ RSpec.configure do |config|
   # config.filter_gems_from_backtrace("gem name")
   config.include FactoryBot::Syntax::Methods
 end
+
+Shoulda::Matchers.configure do |config|
+  config.integrate do |with|
+    with.test_framework :rspec
+    with.library :rails
+  end
+end