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Reversible logic is emerging as an important research area having its application in diverse fields. Reversible circuits can be used in the fields of low-power computation, cryptography, digital signal processing, communications and the emerging field of quantum computation. Regardless of the eventual technology adopted, testing is sure to be an important component in any robust implementation. A new approach for automatic conversion of any given reversible circuit into an online testable circuit that can detect online any single-bit errors, including soft error in logic block is described in this paper.