Information Technology Reference
In-Depth Information
F
IG
. 6. An example Markov chain.
with complex operational scenarios and sequences than Musa's OPs above or deter-
ministic FSMs described in Section
4
. This hierarchical structure and the associated
flexibility set this approach apart from earlier approaches to statistical testing using
Markov chains.
Test cases can be generated by following the states and state transitions in UMMs
to select individual operational units (states) and link them together (transitions) to
form overall end-to-end operations. Possible test cases with probabilities above spe-
cific thresholds can be generated to cover frequently used operations. In practical
applications, thresholds can be adjusted to perform progressive testing, similar to
that used with Musa OPs we described earlier. Several thresholds have been initially
proposed
[2]
and used in developing UMMs
[20,49]
:
