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rails--rails/activesupport/test/time_zone_test_helpers.rb

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module TimeZoneTestHelpers
def with_tz_default(tz = nil)
old_tz = Time.zone
Time.zone = tz
yield
ensure
Time.zone = old_tz
end
def with_env_tz(new_tz = 'US/Eastern')
old_tz, ENV['TZ'] = ENV['TZ'], new_tz
yield
ensure
old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
end
end