Results 1 to 4 of 4

Thread: combinations

  1. #1


    Suppose a web page has three combo box and each combo box has 4 choices. Do I have to test all combinations, which are 3^4 combinations?

    If a tester needs to exhaust all combinations, in a more complex environment, how could she finish the testing?


  2. #2
    Join Date
    Mar 2004
    West Coast of the East Coast!

    Re: combinations

    With only 12 combos I would test them all, but when the number gets much higher it's time to just sample them. Unless the selections are super critical then select maybe the first, last and one or two in the middle. Just remember, the more you don't test the higher the risk of a defect in the field.

    Testing is never finished, just abandoned!

    Personal Comment

    Success is the ability to go from one failure to another with no loss of enthusiasm.
    ~ Winston Churchill ~

    ...Rich Wagner

  3. #3

    Re: combinations

    If you have a complex environment, you have to optimize the test.

    Imagine you have a million combinations and it takes a second to run only one of them. Then the whole test will run for 11 days. Is it acceptable and necessary in your environment? If yes, no actions need to be done.

    If no, you can try to either reduce time spent for each combination, or to reduce total number of cases, or both.

    To reduce the time spent for each test case, you can separate testing of back-end and front-end. For example, you have 6 options by 10 variants each. Here you can divide tests on two groups. One of them will test that part of back-end for each this 10^6 combinations are critical and one will test front-end where it may be acceptable to test only that front-end executes proper option from back-end.

    If you go further, and find parts of tested system that can be tested separately, you can reduce the number of test cases themselves.

    Another method for reducing combinations is called “All-Pairs”. James Bach wrote a tool to generate such combinations. You can take it from http://www.satisfice.com/tools.shtml
    It includes the description of the method. Using this method you can reduce number of cases down to several hundreds or few thousands.

  4. #4
    Senior Member
    Join Date
    Apr 2003
    Wisconsin, USA

    Re: combinations

    If your inputs fall into distinct classes with common attributes, some equivalance partitioning and boundary testing may help you reduce the number of tests to run.



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
BetaSoft Inc.
All times are GMT -8. The time now is 07:50 PM.

Copyright BetaSoft Inc.