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-rw-r--r--spec/lib/formatter_spec.rb8
1 files changed, 8 insertions, 0 deletions
diff --git a/spec/lib/formatter_spec.rb b/spec/lib/formatter_spec.rb
index cc32f7fd6..dfe1d8b8f 100644
--- a/spec/lib/formatter_spec.rb
+++ b/spec/lib/formatter_spec.rb
@@ -204,6 +204,14 @@ RSpec.describe Formatter do
         is_expected.to_not include '<script>alert("Hello")</script>'
       end
     end
+
+    context 'contains malicious classes' do
+      let(:text) { '<span class="status__content__spoiler-link">Show more</span>' }
+
+      it 'strips malicious classes' do
+        is_expected.to_not include 'status__content__spoiler-link'
+      end
+    end
   end
 
   describe '#plaintext' do