Evaluating the Effect of Control Flow on the Unit Testing Effort of Classes: An Empirical Analysis

Table 1

Assignment rules of the probabilities.

Nodes	Probability assignment rule
(if, else)	0.5 for the exiting arc “condition = true”; 0.5 for the exiting arc “condition = false”
while	0.75 for the exiting arc “condition = true”; 0.25 for the exiting arc “condition = false”
(do, while)	1 for the arc: (the internal instructions are executed at least once)
(switch, case)	1/n for each arc of the n cases
(?,:)	0.5 for the exiting arc “condition = true”; 0.5 for the exiting arc “condition = false”
for	0.75 for entering the loop; 0.25 for skipping the loop
(try, catch)	0.75 for the arc of the “try” bloc; 0.25 for the arc of the “catch” bloc
Polymorphism	1/n for each of the eventual n calls