  Metamorphic Testing (MT) is a testing technique that can effectively
alleviate the oracle problem. MT uses Metamorphic Relations (MRs) to determine
if a test case passes or fails. MRs specify how the outputs should vary in
response to specific input changes when executing the System Under Test (SUT).
If a particular MR is violated for at least one test input (and its change),
there is a high probability that the SUT has a fault. On the other hand, if a
particular MR is not violated, it does not guarantee that the SUT is fault
free. However, deciding if the MR is being violated due to a bug or because the
MR does not hold/fit for particular conditions generated by specific inputs
remains a manual task and unexplored. In this paper, we develop a method for
refining MRs to offer hints as to whether a violation results from a bug or
arises from the MR not being matched to certain test data under specific
circumstances. In our initial proof-of-concept, we derive the relevant
information from rules using the Association Rule Mining (ARM) technique. In
our initial proof-of-concept, we validate our method on a toy example and
discuss the lessons learned from our experiments. Our proof-of-concept
demonstrates that our method is applicable and that we can provide suggestions
that help strengthen the test suite for regression testing purposes.
