Add IP-based rules (#14963)

spec/lib/fast_ip_map_spec.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe FastIpMap do
+  describe '#include?' do
+    subject { described_class.new([IPAddr.new('20.4.0.0/16'), IPAddr.new('145.22.30.0/24'), IPAddr.new('189.45.86.3')])}
+
+    it 'returns true for an exact match' do
+      expect(subject.include?(IPAddr.new('189.45.86.3'))).to be true
+    end
+
+    it 'returns true for a range match' do
+      expect(subject.include?(IPAddr.new('20.4.45.7'))).to be true
+    end
+
+    it 'returns false for no match' do
+      expect(subject.include?(IPAddr.new('145.22.40.64'))).to be false
+    end
+  end
+end