Fix the missing password confirmation test case

Add `require 'pathname'` to the spec_helper.rb to avoid `Uninitialized Pathname constant` error

Use expect(response.body).to include('password_confirmation') to avoid errors caused by changes in responses on different Rails' versions

spec/requests/admin/users_controller/updated_ajax_spec.rb

@@ -49,10 +49,10 @@
         patch "/admin/users/#{current_user.id}/updated_ajax", params: { password: { password: 'new password' } }
 
         expect(response.status).to eql(400)
-        expect(response.body).to eql(
-          'ERROR: ActionController::ParameterMissing, ' \
-            'param is missing or the value is empty or invalid: password_confirmation'
+        expect(response.body).to start_with(
+          'ERROR: ActionController::ParameterMissing, param is missing or the value is empty'
         )
+        expect(response.body).to include('password_confirmation')
         expect(current_user.reload.authenticate('secret')).to be_truthy
         expect(current_user.reload.authenticate('new password')).to be_falsey
       end

spec/spec_helper.rb

@@ -1,5 +1,6 @@
 ENV['RAILS_ENV'] ||= 'test'
 
+require 'pathname'
 CAMALEON_CMS_ROOT = Pathname.new(__FILE__).join('../..')
 
 require File.expand_path('dummy/config/environment.rb', __dir__)