Another fix

spec/models/user_callout_spec.rb

 require 'rails_helper'
 
 describe UserCallout do
-  let!(:callout) { create(:user_callout) }
-
   it_behaves_like 'Unique enum values'
 
+  let!(:callout) { create(:user_callout) }
+
   describe 'relationships' do
     it { is_expected.to belong_to(:user) }
   end

spec/models/user_spec.rb

@@ -4,6 +4,8 @@ describe User do
   include ProjectForksHelper
   include TermsHelper
 
+  it_behaves_like 'Unique enum values'
+
   describe 'modules' do
     subject { described_class }
 
@@ -159,8 +161,6 @@ describe User do
 
     it { is_expected.to validate_length_of(:bio).is_at_most(255) }
 
-    it_behaves_like 'Unique enum values'
-
     it_behaves_like 'an object with email-formated attributes', :email do
       subject { build(:user) }
     end

spec/support/active_record_enum.rb

 # frozen_string_literal: true
 
 shared_examples 'Unique enum values' do
-  described_class.defined_enums.each do |name, hash|
-    it "has unique values in #{name}" do
-      duplicated = hash.group_by(&:last).select { |key, value| value.size > 1 }
+  described_class.defined_enums.each do |name, enum|
+    it "has unique values in #{name.inspect}" do
+      duplicated = enum.group_by(&:last).select { |key, value| value.size > 1 }
 
       expect(duplicated).to be_empty,
         "Duplicated values detected: #{duplicated.values.map(&Hash.method(:[]))}"