Domain Testing: Divide and Conquer - Testing Education

Step 8:
Backtracking:
• Erase the third set of variable ‘f’ since the choice of ordering was based on the
ordering of the previous set.
• Let us swap the ordering in set two for variable ‘f’, from F2 followed by F1 to F1
followed by F2 and see if this does any good.
Test
case#
a(3) b(2) c(2) d(2) e(2) f(2)
1. A1 B1 C1 D1 E1 F1
2. A1 B2 C2 D2 E2 F2
3. A2 B1 C2 D2 E1 F1
4. A2 B2 C1 D1 E2 F2
5. A3 B1 C1 D2 E2
6. A3 B2 C2 D1 E1
• Let us now have F2 followed by F1 for the third set of variable ‘f’.
Test
case#
a(3) b(2) c(2) d(2) e(2) f(2)
1. A1 B1 C1 D1 E1 F1
2. A1 B2 C2 D2 E2 F2
3. A2 B1 C2 D2 E1 F1
4. A2 B2 C1 D1 E2 F2
5. A3 B1 C1 D2 E2 F2
6. A3 B2 C2 D1 E1 F1
• This arrangement does not work either since now F1 is paired with only E1 and
F2 is paired with only E2.
• In fact, no matter what ordering you try you just can’t fit in all-pairs in these six
test cases or combinations.
Refer guideline numbered 12 in Appendix B: Guidelines for filling in “allpairs
combination” table
© Sowmya Padmanabhan, 2003
9