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What is LCSAJ Testing?

LCSAJ stands for Linear Code Sequence And Jump) is defined as a linear sequence of executable code commencing either from the start of a program or from a point to which control flow ay jump and terminated either by a specific control flow jump or by the end of the program. It may contain predicates which must be satisfied in order to execute the linear code sequence and terminating jump.

**Example**
**
**Some reformatting may be needed to allow LCSAJs to be expressed in terms of line numbers. The
basic reformatting rule is that each branch must leave from the end of a line and arrive at the start of a line.
Consider the following program which is designed to categorise positive integers into prime and nonprime, and to give factors for those which are non-prime. Note that integer division is used, so Num DIV 2 will give a value of 2 when Num = 5, for example. The code on line 5 calculates the remainder left after Factor is divided into Num. For example, if Factor is 5 and Num is 13, the expression evaluates to 3. For reasons of simplicity, the program makes no checks on the input.

1 READ (Num);
2 WHILE NOT End of File DO

3 Prime := TRUE;

4 FOR Factor := 2 TO Num DIV 2 DO

5 IF Num - (Num DIV Factor)*Factor = 0 THEN

6 WRITE (Factor, ` is a factor of', Num);

7 Prime := FALSE;

8 ENDIF;

9 ENDFOR;

10 IF Prime = TRUE THEN

11 WRITE (Num, ` is prime');

12 ENDIF;

13 READ (Num);

14 ENDWHILE;

15 WRITE (`End of prime number program');
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