Testing that code executes within a block, e.g. transaction or time zone

spec_example.rb

it('uses the client time zone') do
  allow(described_class).to receive(:delete_cache) do
    fail unless Time.zone == client_time_zone
  end
  allow(described_class).to receive(:create_cache) do
    fail unless Time.zone == client_time_zone
  end
  update_for_year
end

it('uses a transaction') do
  test_transaction = ActiveRecord::Base.connection.current_transaction
  allow(described_class).to receive(:delete_cache) do
    fail if ActiveRecord::Base.connection.current_transaction ==
      test_transaction
  end
  allow(described_class).to receive(:create_cache) do
    fail if ActiveRecord::Base.connection.current_transaction ==
      test_transaction
  end
  update_for_year
end