Fix banned text being able to be circumvented via unicode (#35978)

spec/lib/antispam_spec.rb

@@ -4,7 +4,7 @@ require 'rails_helper'
 
 RSpec.describe Antispam do
   describe '#local_preflight_check!' do
-    subject { described_class.new.local_preflight_check!(status) }
+    subject { described_class.new(status).local_preflight_check! }
 
     let(:status) { Fabricate :status }
 
@@ -39,6 +39,30 @@ RSpec.describe Antispam do
         end
       end
 
+      context 'when status matches unicode variants' do
+        let(:status) { Fabricate :status, text: 'I use https://𝐛𝐚𝐧𝐧𝐞𝐝.𝐞𝐱𝐚𝐦𝐩𝐥𝐞 urls in my text' }
+
+        it 'raises error and reports' do
+          expect { subject }
+            .to raise_error(described_class::SilentlyDrop)
+            .and change(spam_reports, :count).by(1)
+        end
+
+        context 'when report already exists' do
+          before { Fabricate :report, account: Account.representative, target_account: status.account }
+
+          it 'raises error and does not report' do
+            expect { subject }
+              .to raise_error(described_class::SilentlyDrop)
+              .and not_change(spam_reports, :count)
+          end
+        end
+
+        def spam_reports
+          Account.representative.reports.where(target_account: status.account).spam
+        end
+      end
+
       context 'when status does not match' do
         it { is_expected.to be_nil }
       end