4.1When and why would an infeasible test case be useful?
4.2Program P4.1 contains two JGstatements. As explained in
Example 4.8, this program contains an interaction fault. Consider
a test setTthat ensures that each of the two JGstatements is
executed at least once and that each of the two conditions
(x ==x
1
andy == y
2
)and(x ==x
2
andy == y
1
) evaluates to
USVFand GBMTFin some execution on an input fromT.(a) Does
there exist a Tthat will not reveal the interaction fault? (b) Why
might the value of z cause the fault to be not revealed even when
the fault is triggered?
4.3Construct an example program that contains one two-way and
one three-way interaction fault. Generate a test set Tthat reveals
the two interaction faults ...
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