EXERCISES
EXERCISES
4.1 When and why would an infeasible test case be useful?
4.2 Program P4.1 contains two if statements. As explained in
Example 4.8, this program contains an interaction fault. Consider
a test set T that ensures that each of the two if statements is
executed at least once and that each of the two conditions
(x == x
1
and y == y
2
)and(x == x
2
and y == y
1
) evaluates to
true and false in some execution on an input from T. (a) Does
there exist a T that 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?
4.3 Construct an example program that contains one two-way and
one three-way interaction fault. Generate a test set T that reveals
the two interaction faults ...