Pending example models minimal coverage (#23912)

spec/models/ip_block_spec.rb

@@ -2,6 +2,14 @@
 
 require 'rails_helper'
 
-RSpec.describe IpBlock, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+describe IpBlock do
+  describe 'to_log_human_identifier' do
+    let(:ip_block) { described_class.new(ip: '192.168.0.1') }
+
+    it 'combines the IP and prefix into a string' do
+      result = ip_block.to_log_human_identifier
+
+      expect(result).to eq('192.168.0.1/32')
+    end
+  end
 end