Detect data change in test step
hasChanged( returns u)true
if the value of u changes since the beginning of the test step.
Otherwise, hasChanged returns false.
Detect if x has changed value. This statement returns
true if x has changed.
hasChanged(x)
For a bus with two signals, signal_1 and
signal_2, and data as the name of the input to the
test sequence, detect when the value of signal_2 has changed.
hasChanged(data.signal2)
hasChanged statements can be used in the Test Sequence and Test
Assessment blocks and in Stateflow® charts.