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