Test case Generator with Optimized coverage - Orthogonal Array Testing Strategy (OATS)

  1. Are you Confident about your test coverage?
  2. Do you have millions of permutations and combinations to be covered in testing?
  3. is automation the solution to cover million combinations?
  4. why can not my system decide what test cases to be executed to give complete test coverage?
  5. As part of CI/CD , instead of executing same test cases irrespective changes going in, would you like to execute more appropriate test cases ?

I will be presenting quick demo on statistical approach and strategy which can help us to generate appropriate number of test cases automatically based on the impacted areas and business metrics . Let me share an example below.

Let’s say we are testing any eCommerce application Flipcart or amazon. We will have to cover multiple combinations like different categories of items, different payment types, shipping types, Promotions, user types etc.. . I will use little bit of sets theory here.

Let us take below 5 sets as an example. Assume that there is new payment type is getting introduced as “Paypal” as enhancement. If we need to make sure this new payment type is working with all products, all shipments types , all user types etc… we will have to cover all permutations and combinations which is nothing but Cartesian product of all these sets. The Cartesian product of below 5 sets is - 6*3*2*4*3 =432 test cases.

Do we really need to execute 432 test cases just for one new payment type ? we just need to execute 24 test case to give confident test coverage .This can be done with OATS tool which is developed with intelligence with Business user Metrics + Orthogonal array testing approach ( OATS) approach . OATS tool will generate required number of test cases with simple input and one click .

There are 2 key areas of input that we consider before we generate optimized tests.

1. Business user metrics - Example : if you look at the below payment set , we would like to know what % of customers using each payment type in overall successful transactions. let us assume 60% Credit card payments , 20 % paytm and 20% rest of payment types . These metrics will help tool to give more weightage to Credit card test cases over other payment types. This make sense because we need to focus more on the areas our end users are using.

2. Impacted areas: let us take an example that there is new payment type (AmazonPay) is getting introduced as en enhancement. We should give more weightage to payment set and make sure all existing payment types are tested with different combinations.

Set1 - PAYMENT = { Cash, Credit card , Paytm , AmazonPay, Debit card}- # elements - 6

Set2 – SHIPPING – {Shiptoday, Prime Shipping, ship Tomorrow}-# elements - 3

Set3 – USER TYPE - { Guest User , Logged in user }-# elements - 2

Set4 – PRODUCT TYPE – {Electronics, Groceries, Books , Stationary}- # elements - 4

Set5 – PROMO TYPE – { Promo1 , Promo2 , Promo3}-# elements – 3

I will be covering how this can be done in detail during presentation along with Tool Demo which was built in with an intelligence using sets theory . you will get an answer on why only 24 test cases are good enough instead of 432 test cases for the change new payment type got introduced.

Advantages :

1. Optimized coverage with less test cases

2. Tester will be confident about test coverage

3. This tool output can be integrated with Selenium key word driven framework . All this happens during run time w/o manual intervention.

4. This strategy is good fit for automation testing .

5. if any combinations are invalid to test, those combinations will be excluded while generating tests.

6. There are tools in the market to provide statistics about untested code (Ex: JaCoCO ). These statistics can be used as input for OATS tool. We have not done this yet.


1. We have seen great value (reduced bug escape) applying this strategy to automated tests. However there is limitation in applying the same strategy to manual exploratory , Adhoc testing.

2. We have not tried this strategy for performance testing yet.

3. There are corner scenarios where human can only think will not be covered by this tool . These scenarios to be appended to generated test cases .


Outline/Structure of the Case Study

1. Problem statement -5 mins

2. Approach & strategy with examples - 10 mins

3. Exercises to audience from different domains -10 mins

3. Demo on tool including technical walkthrough - 15 mins

4. Q&A - 5 mins

Learning Outcome

1. Participants will understand how mathematical concepts studied in schools/colleges can be applied to our day to day jobs to increase the efficiency. (Sets theory , Permutations & combinations, Probability )

2. Audience will understand OATS approach and Strategy to design testing cases. once they go back to work, they can apply this strategy to test appropriate number of test cases . Also Audience will be able to build similar tool based on their application functionality.

3. This will encourage audience to build more in-house tools in future while applying statistical and mathematical concepts .

Target Audience

Quality assurance professionals

Prerequisites for Attendees

Basis understanding of sets , permutations and combinations.

schedule Submitted 1 month ago

Public Feedback

comment Suggest improvements to the Speaker
  • Robin Gupta
    By Robin Gupta  ~  1 month ago
    reply Reply

    I like these aspects of the submission, and they should be retained:

    • Pairwise concepts
    • Expansion of test coverage

    I think the submission could be improved by:

    • Adding content which aligns/overlaps with the Selenium conference theme
    • Covering contemporary tools like Hexawise etc  
    • Describing limitations/drawbacks of the pairwise testing methodology 
    • Srinivasu gangam
      By Srinivasu gangam  ~  1 month ago
      reply Reply

      Thank you Robin for your feedback. I will be update the proposal accordingly. 

      • Pooja Shah
        By Pooja Shah  ~  3 days ago
        reply Reply

        Hi Srinivasu,

        Adding to Pallavi and Robin, I too love the innovation focus in this talk, however to really benefit the attendees it's recommended that even if the implementation has to be private, if you plan to showcase:

        - How you have built it and the architecture so that attendees leave with widening their knowledge base to go try out. (which you seem to have already added in the outline, good)

        May be if not everything, the process/architecture can be openly documented. The more open the better. 

        This is just my opinion based on my own example, I too when I decided to share one of my pieces, initially it felt difficult to make public due to tight binding with my company internals however once I decided, figured ways to open-source and learnt better code-refactoring in return. Eg. http://github.com/moengage/alice and I still get to hear from people how they picked several things from the architecture description in their own ways and achieved something entirely different from what the bot is focused on. 

        So yea, The more open the better. Awaiting to hear back and please keep tab on the timeline https://confengine.com/selenium-conf-2020/timeline

        • Srinivasu gangam
          By Srinivasu gangam  ~  2 days ago
          reply Reply

          Thank you Pooja, for your time in reviewing this proposal. I agree with your suggestion. This tool is application independent & I will be using flipcart or amazon application as an example in my demonstration to show end to end implementation approach. I can share process/architecture documentation part of my presentation (This is not my company's proprietary information and it can be shared). Please let me know if you have any additional questions. 

    • Srinivasu gangam
      By Srinivasu gangam  ~  1 month ago
      reply Reply

      Hi Robin, 

      Thank you for your feedback. As per your suggestions, i have updated proposal to align with Selenium conf theme, covering other tools in the market , Limitations of this approach. 

  • Pallavi Sharma
    By Pallavi Sharma  ~  1 month ago
    reply Reply

    Hi Srinivasu

    Adding to the points by Robin, may i suggest a few more -

    a. please change the word tool to strategy - because i believe what you would be explaining is an approach/strategy not showcasing a tool around it [commercial/opensource ] around it? 

    b. I would think it would do good if you can increase your talk time from 20 minutes, because it is a very interest generating topic and people can really learn, if you can also add a few hands on exercises during the session and make people work on it to really learn out from your sessions and benefit from OATS. 

    c. "2. Audience will learn how to build in-house custom tools", this is really intrguing. can you explain more about it. 



    • Srinivasu gangam
      By Srinivasu gangam  ~  1 month ago
      reply Reply

      Hi Pallavi, 

      Thank you for your feedback . Here are my answers :

      Answer for a) Your are right , I will be explaining Approach/Strategy on how we can generate optimized number of test cases to have full coverage. however we built in-house tool  with based on this concept which will take in put as impacted areas  + Business metrics on user journey  to generate the output of test cases . We have built intelligence in the tool  to generate right number of test cases.

      Answer for B) : Its really good idea to have some exercises to audience based on multiple use cases . I will work on the 3 to 4 exercises different domains (healthcare , E-Commerce etc..) . I will update the outline/structure and increase the  time to 45 mins by tomorrow. 

      Answer for C) As i mentioned in answer (A) , we have built in-house tool with an intelligence using Java programming to take the input (Impacted areas +  user Journey related Metrics ) and generate appropriate number of test cases. The user has to key in details in Excel and run the .bat file to generate output. Please let me know if you need more details on this.  This really motivate the audience to build in-house tools based on challenges. 


      • Pallavi Sharma
        By Pallavi Sharma  ~  1 month ago
        reply Reply

        Hi Srinivasu

        The "tool" which you have inhouse, is that propreitary to your organization, or can it be made public for anyone to use? 

        Or will you be sharing the algorithm for it so that depending upon the end user requirements at their end the people can build their own OATS tools? 

        how would this go? 



        • Srinivasu gangam
          By Srinivasu gangam  ~  1 month ago
          reply Reply

          Hi Prallavi, 

          The tool that we developed is not a proprietary of my organization. But it has Organization's application specific information in excel and in algorithm which i can not use part of demonstration. 

          I can use Flipcart or  Amazon for demonstration purpose  with minor changes in tool (excel and Algorithm ). Hope this helps. 

          To answer your 2nd question, I can share sample algorithm during my presentation and that can be customized as per end user requirements. 


          • Pallavi Sharma
            By Pallavi Sharma  ~  1 month ago
            reply Reply

            Okay, thanks for writing back. 

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    Srinivasu gangam
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    Cotiviti India
    schedule 3 months ago
    Sold Out!
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