This application is free to use for training purpose. You are not authorized to publish answers in public on blogs, forums, groups, or any other public medium.

I have created this small application in order to provide as an exercise in finding bugs and patterns. It is a little bit weird but so does some applications to test in real environment.

So please add comments or sent an email if you detected some of the patterns or bugs.

Hint:
pattern: There is a regular star polygon drawn that has the number of sides equal to number entered
bug Entering values like “6.” draws a triangle instead of 6 sided star polygon

Edit: I removed the comments with solutions to give opportunity to others to test themselves. If you really want to give the solution please sent at eusebiu.blindu@testalways.com

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1. James Bach says:

   July 5, 2010 at 9:48 pm

   Nice puzzle. What’s the mission, though?

   Without a mission, it’s hard to know if I’ve solved the puzzle. But I’ve learned a lot about it.

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2. Eusebiu Blindu says:

   July 5, 2010 at 10:26 pm

   @James Bach

   Thanks for solving ALL patterns within minutes!
   I am stunned…

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3. UnChaparrito says:

   July 7, 2010 at 5:48 pm

   I detected the next bugs(?):
   - Entering values not numeric always draw a 3-side triangle.
   - Entering integer values less five don’t draw a star.

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4. Sonia Fransin says:

   July 11, 2010 at 6:52 am

   Interesting puzzle, I think there are many traps to think complexly, but simplicity is always best.

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5. Alternative Paths for Self-Education in Software Testing by Markus Gaertner (EuroStar talk) « Testing Thoughts says:

   December 2, 2010 at 1:08 pm

   [...] Eusebiu Blindu, for example, has challenges on his website as well (link, link, [...]

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6. Ranjit says:

   September 14, 2011 at 9:59 pm

   Perhaps too late in responding, but never late to attempt a puzzle, I’ve emailed you my observations… Your feedback is much appreciated.

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7. Beware of the Lotus Eaters: Exploratory Testing | LogiGear Magazine says:

   February 7, 2012 at 8:43 am

   [...] Eusebiu  Blindu, a Czech tester, recently came up with an interesting online challenge. He created a testing exercise in finding bugs and patterns. The application drew a polygon with the number of sides determined by a number you entered into the field. You can see it here: http://www.testalways.com/2010/07/05/find-bugs-and-patterns/ [...]

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8. Neha Jain says:

   August 13, 2012 at 12:43 pm

   pattern: the sides entered will display the figure having that many number of vertices, the number displayed inside the figure is the number of triangles used to form that figure.
   bug: when 5 is entered in the sides in the input box, it displays 9. It should display 3 as this figure can be formed by using 3 triangles.

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   • Eusebiu Blindu says:

     August 13, 2012 at 12:47 pm

     Thanks for giving your solution. But it’s not that. The pattern (if you take a larger number of samples ) is another one and the exceptions (bugs) are other. Your solutions assumes a pattern only on a very small sample of data.

     Please give the rest of your answers at eusebiu.blindu@testalways.com so other can try it.

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9. SHAFI says:

   September 21, 2012 at 6:00 pm

   pattern: The sides entered (x>=5) will display the figure that have two*x edges connected to an end point with each other and other two end point connected to the circle.
   bug: The slides enterd less than 5 will display the figure that have x edges conneted with each other.

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10. John says:

    September 22, 2012 at 6:35 am

    Bug : Entering values like negative always draw a 9-side triangle.
    Entering larger values like for 100000 always makes the image disappear,so it can not take larger values like that.

    Pattern:It can not make star for non negative values less than 5 ,only make polygonal star for the values greater or equal 5,but can not take larger values like 100000

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    • John says:

      September 22, 2012 at 6:35 am

      *3 Side triangle

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    • Eusebiu Blindu says:

      September 22, 2012 at 6:43 am

      Please send the solutions to eusebiu.blindu@testalways.com . Thanks for the pattern try,but can you give the solution for the number generated in the middle of the picture?(by email)

      Thanks for trying the puzzle

      Reply to this Comment