Method,apparatus and computer-readable medium for testing an integrated circuit

A method of testing an Integrated Circuit (IC) includes: loading a sequence of data into a chain of circuit elements that hold data values, where outputs of at least some circuit elements are connected to inputs of adjacent circuit elements so values move sequentially through the chain between a chain input for loading values and a chain output for unloading values, and a first circuit element includes a retention element for saving values during power variations related to the IC. The method further includes: saving a value from the data sequence in the retention element; and accessing the retention element for verifying an accuracy of the saved value from the data sequence.