Add unit test

spec/presenters/error_summary_full_messages_presenter_spec.rb

@@ -0,0 +1,11 @@
+require "rails_helper"
+
+RSpec.describe ErrorSummaryFullMessagesPresenter do
+  let(:error_messages) { { reset_password_token: %w[expired] } }
+  let(:formatted_error_messages) { [[:reset_password_token, "Reset password token expired"]] }
+  subject { described_class.new(error_messages) }
+
+  it "formats messages to include the attribute name" do
+    expect(subject.formatted_error_messages).to eq(formatted_error_messages)
+  end
+end