Cross delivery

After the introduction of shorter release cycles, I noted a higher rate of bugs and features that had to be cross-delivered. Often this cross-delivery caused additional problems either because it happened on the wrong stream or it went forgotten. As a result old known bugs re-occurred in different streams.

I worked several hours on this cartoon and I prepared not less than 10 different drafts which I all abandoned because I was not happy with the characters I chose to represent the code pieces. l I finally decided to take that little triangle from Java. I kept a few of the drafts and decided to upload the last two of them so you can see how things develop.

Lineup of the ugly bugs

This is one of these wonderful moments where you get flooded by some nice creatures that can ruin your day or even the week.

Finding the right moment for your tests

There are these great moments in a testers's life when you realize that some of those great testing ideas tests should have been applied a little earlier.

Use the tools

If you have the tools, use them

The Debugger

...

Foreign Particles in the Code

There was this ugly bug which was sitting quite comfortable on this box until this chain of code went live and the release manager asked once more "why haven't you found this bug"?

Why is it always the testers who "fail" when a bug is going live and why is none ever asking the developers why they introduce bugs without asking the testers upfront for permission to ship  bugs?

High IQ cat

All of us had to go through this weird online game which - we believe - should demonstrate how we work, maybe gather our IQ or how we deal with pressure. Actually none knows.... We never got the results, no feedback not even to bugs that we reported during the game...but what was the most funny moment  - the root cause for this cartoon - was someone not playing but simply letting the game play by itself. No human interaction, simply doing nothing, no keyboard clicking or whatsoever...just standby and this person got the same amount of points like others who were hacking into the keyboard like crazy....What does it tell us? That game was either crap and with it of course all the results that were collected from the employees or there is something we just didn't know. We will never know.

Playing with Darts

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Empire State Building built with MINECRAFT

Sorry no cartoon today but something else impressive. The Empire State Buidling built by my son, block by block in MINECRAFT.

Watch video here:
Empire State Building built with MINECRAFT

Hard lessons in the Antarctic

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Selfie Bugs

These bugs were inspired by Geri Müller

Snow white's Facebook profile

Fairy tales put into today's context

Compatibility Challenges

At the time I made this cartoon and when it was  published first in "Die neue Schulpraxis (02/2014), I didn't have any concrete scenarios in mind, but it happened just by accident that this cartoon now fits perfectly to an issue I faced recently where we deployed an updated version of the back-end software which was incompatible to very old client applications that communicate to our back-end system.

Robots Wedding

First published in
"Die neue Schulpraxis (2/2014)"

Arctic Tennis

First cartoon this year..

BTW, I was asked whether it was by purpose that I took a FEMALE penguin sitting on this tennis ball. Not really. The truth is, first I used a male penguin but then I suddenly questioned whether male penguins do hatch eggs. I wasn't quite sure but I still had in my mind that male and female are taking turns between each other. At that time it was already too late to verify (01:00 am) and I was too tired to do proper investigation. In the meantime I verified it. Both penguins are breeding the eggs. While one is hunting for food, the other takes over the breeding job.

Robot Breeding

published also at the "Testing Planet" here
ThnX Simon.

New App in town

This app introduced a completely new driving experience...

BTW, please excuse the grey shade in the last two cartoons. This is an ugly boring bug within Google's Blogger tool which introduces a grey background into all uploaded pictures even though whey are supposed to be clearly white.
There are some comments from other bloggers who suffer of the same problem. 

Waterproof

Dumbo talking

Off the Scent

I was asked by The Testing Planet magazine whether I could provide a cartoon about leadership. Until then I focused primarily on drawing cartoons about my daily experience in software testing and less on management issues. I thought it was covered already well by Dilbert. But since I met some interesting and questionable decision makers, too, it wasn’t so difficult to turn their messages on paper, like this one here, where I illustrated a "visionary" guy with zero abilities of context driven thinking.

Risk Management

Risk is a combination of both, the probability of a bug to happen in production and the art of understanding the impact for the customer. As is with lots of such decisions, people might have different views on the impact depending on how well they understand the customers' needs.

End of the World

This is the last cartoon for this year and it's really time to sit back for a moment, relax from "hard" work and my sporting injuries. Merry X-Mas and a happy new year to all of you  who are following me either through this blog or via my email distribution list. See/draw you again, next year.

Best wishes Torsten

Performance Testing

This is a reworked cartoon. Originally I drew the cartoon without any keyboards at his hands/tentacles and it was actually also published like this in "The Testing Planet". But now the joke is a little bit more clear, I guess. Enjoy.

How to do performance testing
What a test manager is interested before going live is often this: "Does the system respond fast enough and still accurately if there are 10,20,30 or more users's working in parallel?

Performance testing tools provide you the ability to develop scripts that fire scripted scenarios and measure their response time when executed isolated or all together using these ramp up numbers. Often, problems already show up with a much smaller number of parallel users using the system. Before you buy expensive experts, solve these problems first. Write either one or more simple Selenium UI scripts or some API-tests like REST/SOAP, build an endless loop around it and ask some colleagues whether they are willing to run the scripts from their workstations. Then find a free workstation where you can do manual testing in parallel to feel how it is not to be alone anymore.

If that reveals no bugs, move to the next stage and hire experts who can do the ramp-up as explained in the first sentence. Usually you should come up with 4-5 typical scenarios which cover at least 1 read, 1 update, 1 create and probably 1 delete operation. Not more, because scripting and providing test data for these scripts can be the most time-consuming and costly part in a performance test session. Also note, that a typical distribution of user's actions is 90/5/5 (90% read, 5% update, 5% create) or 80/10/10 or similar.

When using a professional performance testing tool (or working with an expert company), make sure you test the different scenarios in isolation. That means, let's test what happens if you have 10,20,30 or more users only doing read requests, then do the same only for update and yet another set only for creation. In most cases you will learn that a high number of read requests are nearly noticeable while it is often a different story once you test one of the other scenarios. Combining all scenarios together is more realistic but should be done after you have already learnt about the first tests. A combination makes it always hard to pinpoint "who is the problem"?

Don't forget to have someone manually test the system while you are running the automated performance test scripts. Learning how it feels if all of a sudden the performance goes down, is an invaluable information that numbers can hardly give you.

In a project I coached the performance test experts, it turned out the biggest amount of work was spent during the preparation of meaningful test data for the scripts. I mean, we were firing the tests on a real productive database, but finding accurate records with which one could perform the update scenarios without triggering this or that validation message wasn't easy. It turned out it was probably better if we created these data ourselves.

Not only this, we assigned each virtual users to work on only one particular set of data that others don't write to. If we didn't follow this approach, we had another challenge of locked records or trying to update something that was already updated beforehand that would have resulted in validation error messages. Next was the creation of records that allowed only one instance. A second record wasn't allowed. So we had to expand the script to also always delete right after the record was created. Also for this scenario, each virtual user had a particular set of cases that he/she could add new records to without getting in the way of another.

Everyday life at the Southern Hemisphere

People often ask me, how long it takes me to draw a cartoon. I cannot really provide a right answer here as it heavily depends. For this cartoon it took me only about 1 hour. This is very fast and also the number of drafts (only 2) is surprisingly low.  Usually, even though I am not a perfectionist, it takes much longer, probably 2 hours, but I've also worked on cartoons which took me 3 hours. I have stopped coloring my cartoons because this is an extra challenge at which I don't really excel. I mean, I have to spend a lot of time and the outcome is chilling. I think I do much better on some kind of grey scale. 

My daughter askmed me whether I drew the Orca straight out of my head. Of course, NOT. I cannot draw an orca just like this out of my head. I googled the web to understand the most important characteristics, then did two drafts and this is what came out. If I didn't do that, I'd definitly missed the white spots and put the eye at the wrong place. Below you see the "final" before I scan it into the computer and the very first draft.

Final version before scanning into computer

 

 

 Very first draft

Captcha #1

CAPTCHAs are used to prevent automated software from performing actions which degrade the quality of service of a given system and/or to protect the service from attackers trying to hack login credentials using brute-force attacks.

Until now, I never had to test CAPTCHAs but thinking about it, testing CAPTCHAs automatically is impossible if testability isn't considered at all. Testability here could mean for the roboter to offer a backdoor which contains the correct clear-text. Of course such information should only be available to the script and de-activated when deployed live. Sometimes, even I struggle to identify the clear-text of the CAPTCHA, and I am NOT a roboter...

The Thompson Test

Two weeks ago, during a soccer match I experienced a sudden short pain at my left leg, near the achilles tendon. When at hospital, a doctor analyzed my leg, and her first assumption was an Achilles tendon rupture.  But since my pain was at an untypical place, she called another doctor for a second set of eyes, I was told to turnaround, then the doctors hold my left leg, executed an elegant grab handle first on my right, then on my left leg and said “it is clearly an Achilles tendon rupture”.

I was impressed, because it took the doctor only seconds to make a clear statement without even asking me questions about where I feel any pain. Later, the magnetic resonance imaging procedure (MRI) confirmed the doctors' diagnosis. When I later googled the web, I learnt, the doctor executed the so called "Thompson Test".

Now, let's try to bring this experience into context with Software Testing. Of course, otherwise I wouldn’t have mentioned it in my blog. In contrary to the doctors, we testers usually look for bugs and not necessarily how to solve an existing problem. This is more typically the job of a software developer, although we testers also try to help as much as possible in finding some indication for the root cause of the problem (btw, works only if managers don't measure a tester's throughput by counting the number of bugs found...).

We use test techniques that are effective in one area and probably less effective in another. One such technique I use often for documenting software bugs, is the classification according to Kepner-Tregoe. By answering a set of simple questions you may either find the solution to the problem on your own (actually the main goal of this technique) or, if not, you provide at least some valuable set of information to the developer. This makes it much easier for him to localize the issue and become more efficient in solving it. If you want to learn more about Kepner-Tragoe, go ahead, GIYBF.

Additional we use logging tools (actually we have several ones), where we can grab the exact exception message; something that is typically NOT shown to a user because it might frighten him, but it is important for the testers and supporters to have access to, so the developer does not need to spend too much time investigating and trying to reproduce the issue.

TOJZ...still suffering the aftermath of my sporting injury for quite a while...

How a double-click downed the backend-system

The cartoon was originally drawn 2012 by me and it has its roots in us testers suffering from the fact that sometimes our bug reports were not written well enough for the stakeholders to understand the importance of some bugs.

Just early this year (2019), I had an interesting experience for which this cartoon fits even better. This is the story:

A few weeks ago, my automated API based test suite caused the system go to hell in a handbasket. The database service crashed and had to be recovered manually each time someone visited a grid that loaded data from the backend. After some investigation, together with a developer, we found the reason for this exceptionnel behavior that caused all users getting a system non-accessible message.

When I say users, I mean internal developers and testers, because luckily we were still far away from going live. It turned out the system persisted a duplicate UUID. This duplicate piece of data caused the system to crash whenever a query was reading the affected record. I corrected the corrupt entry in the database and the problem was solved. But how the heck did my test suite manage to introduce such duplication? I tried over and over again but never ever did I manage to make my automated tests do the same thing again. As a consequence, the problem was considered low priority based on the assumption the probability for this scenario to re-occur was almost zero. In fact, over a long period of time, this never happend again, until slap bang - during a manual test - I double clicked the OK button in the web page to persist a new object. After a response time of about half a minute, I got the same system non-accessible message. Jackpot!

With something as simple as a double click we got the backend system to crash from a dumb web client which resulted in a denial of service without me to flood the system with superfluous requests.

With this new information the previously low-rated issue all of a sudden got a different kind of attention. The probability of an end-user to double-click a UI element even in web clients is very high. The real reason for the duplication was the fact that the web client created a new UUID in memory already at the time a user was opening the web page for inserting objects. That means, it created the UUID before the user actually submitted the request to the server. When the user finally clicked OK that UUID was passed to the backend as part of other data entered by the user. When one double-clicks the button, the same dataset including the same UUID submitted the request twice in sequence. The backend had no unique index to check for duplicate UUIDs.

The most appaling part in this short story is that none of us ever thought of the double-click as a potential scenario to reproduce when we originally detected it. There were several experts and architects involved in the analysis of the bug and even though I had a great set of test patterns at hand (the double click was on the list), I was unable to think out of the box promptly. Weeks later, I had a weird flash of inspiration and it took me only seconds to reproduce this issue. The good thing is, we are still not live, so there is still time to fix it.

 

Add-on, August 2023:
The cartoon fits perfect to another defect that we detected more than a year ago. A grey-scaled scanned document, when edited and rotated in program A, could no longer be viewed in program B, both tools that were used in parallel. But, the anomaly didn't gain enough attention as it looked like an edge-case and customers never experienced any issues until "slap bang" a customer could no longer export their documents because of edited, grey-scale documents. What followed was weeks of investigation and experiments/workarounds, all without a hunky-dory solution. So yes, that cartoon was like a precursor for the next ugly thing to happen.

ThanX to the The Testing Planet magazine editors who were so kind to publish my cartoon in their issue 8

Good old times

Almost every week, I get some updates notification on my smartphone. Fortunately I can decide on my own on when to download and/or to install it.
Where I work, customers have no such choice. When we upgrade our releases, every customer worldwide either gets some new features or suffers from the fact that we have to deliver another series of extra releases to fix what we've broken in the previous update. Anyhow, it is only a question of time until cars also get equipped with software that you may or may not need to upgrade/patch on a regular basis in order to keep them running while all those oldies will still work fine without.

Automated Test Script Desease #1

If it is not a new unexpected confirmation dialog box that shows up, then it may be a unique GUI control identifier that either changed or is even missing. The response could also be slower than originally recorded. That means we have to either extend the script with hard-coded extra wait statements or - if you are smarter - write some extra logic which always waits for the control to load completely before it gets "touched". The object could also be at a different location, let's say in a list that is sorted differently than before. Hope you didn't record the position but negotiated with the developer for a predicable algorithm so your roboter is still able to reach it even though it shows up somewhere else.Poor you if one detects that the developers now use third party controls that your test automation tool can't deal with. You might also experience ugly test script- or module-dependencies. As if this wasn't enough, you may work in a world where testers don't control the test environment where others can change or update configuration without you knowing until you see the script failing. You may also experience a deployment of a new software version in the middle of test execution or while you are playing Sherlock Holmes to investigate a real fat bug. Your script might only work from your workstation but not from the server you're triggering and executing it ...from one day to the other.

And often, even if none of those typical UI test automation challenges is one that you face today, you will still have to sit there watching the script running,  so you're ready for some extra test script babysitting actions. If you weren't there observing your scripts but going out for a coffee instead, don't expect your roboter to have completed successfully its job when you've come back to your desk...

That is just a few of the reasons, why I love testing below the UI so much.

New procedure for build breakers

A new habit is about to start and it reminds me to the Dark Ages were thieves were put to the pillory, so everyone could see and shout at them.

Giraffe Accessible, The Workaround

A workaround was quickly found, although on the long run, it wasn't the most comfortable position.

Giraffe Accessible

A reference to compatibility in general. For instance, browser compatibility. What works for FF, doesn't necessarily work for IE and/or other kinds of web browsers.

Deployment @ XMas (-Dinner)

Whenever possible, I try to draw cartoons which win a smile from a general audience. This time it is probably too specific and therefore an "insider".

Sorry for that.

The Umlaut Test Pattern

One of the most reliable "bugs" we met regularly is what we call the "Umlaut" bug. Often we notice cases in our database which are displayed incorrectly. Namely Polish and/or German characters are regularly screwed up somewhere. Corrupt here means that it is displayed as a black square with a white question mark or a simple empty rectangle. The test pattern to look for broken text is effective at all test levels, be it it the UI or even at a lower level such as Web Service responses.

And it doesn't stop with Umlauts. Even though it sounds kind of insane when I tell you to use special characters wherever you can. Special characters have been the root cause of so many bugs even at places where only people like me would ever test them. Even an innocent blank between two strings can be considered a special character. For example, “M & M’s World Store in New York”, “Super-Mini-Taxi”, “Dr. Pepper”, “O’Brien”, etc. These are all common names that caused problems in programs we tested.

Examples for broken umlauts

YU55 Near Miss

I dare to ask about the consequences of an eventually failing asteroid observation software.

I think the good news is that there are a lot of amateurs out there who will use a broad variety of similar tools which calculate and “estimate” the same thing. If one of those tools fails, there is still a bunch of others who do it right.

Redundancy is the key to success sometimes. We usually try to avoid this in coding, but it has its place for instance at safety critical applications. But still, it needs a brain, common-sense and - believe it or not - capacity for teamwork, especially if you analyze inconsistent scenarios. Without one or the other, redundancy can also become deadly where it was actually meant to save lives.

The two altimeters in an airplanes cockpit work independent from each other. If one fails, there is still a high chance the other works. But if a hard-headed doesn't take into account that it may be HIS altimeter which fails and not the one of his co-pilot, then it may end up in a disaster like the one in 1990 where the DC-9 was flying about 900 feet (275 m) too low during approach and then hit high ground at Stadlerberg, near Zurich, Switzerland.

Where's the French window?

Please excuse my short excursion away from my traditional cartoons about software testing. But this one is worth looking at, since it is related to testing indirectly.

My family and me just came back from a superb holiday trip at Greece Island Kos. We also made a short trip to Bodrum, Turkey. While we were eating traditional Kebap there, I looked at the building vis-a-vis and was wondering about the architecture of  the balconies. 

Something was wrong with them but I couldn't immediately figure out what it was. After a while I suddenly realized that the sea-side balcony at the second floor had no French window, meaning, it was unreachable. Then I saw that there was another one with the same "pattern" just below in the first floor. Fine, no doors. But why need a balcony there if you can't reach it? As a tester, my first thought was, it must be a bug, maybe an architectural bug,..no idea, just kidding! Maybe the two balconies where there just to achieve some kind of symmetry. 

My theories didn't make sense and so I asked the waiter at our restaurant whether he can tell me more about this special "feature" at the white sea-side building vis-a-vis. 

He didn't really see the problem outright and when he finally noticed, he stood on the sidelines for a moment . Then he explained to me what he was assuming. He thought the doors had been closed with masonry because of the strong wind and because of too much sun at this side of the building. Then I noticed him calling one of his colleagues and pointing to the abnormal balcony. Few seconds later a third colleague came by and all together were discussing excitingly the anomaly they/me just detected. After a while, the waiter came back to me and confessed that he'd never noticed this issue before even though he was working  in the restaurant for several years. He and his colleagues, too, were fascinated about the missing doors and the waiter expressed  to me some kind of amazement about how I as a tourist are looking at things. 

When he said that, I immediately thought about James Whittaker who in his book "Exploratory Testing" often compares testers with tourists. Usually, tourists look at things differently than than those who live there here all the time. As a tourist you don't take things as granted. You are typically more curious and want to learn more about an area you've never visited before. This different view makes you notice things which people take for granted or don't know or care about. My plan is not to make too many relationships to the testing scene here but  fresh eyes will always find new things, no matter how well you do your job as a software tester. At one point in time it is better to have someone else look at your "baby". If you know the SUT  (software-under-test) too well you start to accept and tolerate things where others would move their eyebrows...This message is also for developers who don't think their code needs testing. =;O)

Testers meeting at the bar

Testing is a thankless job. Product owners (and their developers) get the glory when it works and testers are the first to blame if it doesn't. A tester's job is to tell product managers when their baby is ugly even if it is difficult to stay friends after that. But, if testers put on rose-coloured glasses, it is just a matter of time unitl the customer does. Worse, if the customer claims that ALL your babies are ugly.

A Trustworthy Invitation

"2 chairlifts, one of them safe for children"...

Hello? Are you serious? Come on, I mean, a great place indeed, but not a prospectus that convinced me to leave my kids there for skiing, at least not alone.

What if we write something like this to our customers, each time we deploy / ship a new release to production, for example:

"500 new features implemented, 100 of them are tested" 

OK, why not? At least, it would be the truth....=;O)

Early Checkers in the Cretaceous Period

It doesn't matter what kind of tool you buy. Implementing and keeping test automation up and running for a long-term period comes with a cost that a lot of people did not expect when going for test automation. Whenever I had the chance to talk to people about test automation or even see what they've done or started to do, I recognized that most people tried to implement their own frameworks (me included), simply because what they bought or downloaded was not good enough or not easy enough to use for the tester.

Enriching your tool with a test framework that fits your needs is not wrong per se, but what most of my contacts had in common, is the fact that they started to automate testing on the Graphical User Interface (GUI) only.

That is funny, because the GUI is one of the most difficult and complex interfaces to automate for testing. The scripts are usually slow and the GUI changes often. Developers might embed components of different technologies and newer versions of it and your test tool might not (yet) support it. And then, developers start changing the GUI, re-arranging it, inserting additional dialogs that were not there before, etc. That is when a tester / test automation expert / framework developer / is suddenly more busy adapting existing scripts or the framework itself, than writing new test cases.

Doesn't this sound common: "Uhh, ohh that script does not work anymore because they have changed, this and that, so let us exceptionally execute this one test case manually because I need to have the report tonight. Maybe another test script is affected, too, uhh, ohh and may be a third and fourth test script as well".

I call this the Cretaceous Period of Test Automation. The scripts start to die one by one until you see so much red that you are attempted to question test automation and maybe even banish it and put the expensive tools back to the shelf.

I am not telling you here, that GUI Automation is bad. But there are other ways which can be  more effective and easier and cheaper to maintain. For example, testing below the UI. This could be an API or a B2B interface (WebService), or something similar. If you are a lucky quality analyst who tests software components which provide a public interface to customers...use it for testing!
For those, who don't have APIs, ask for it, even if it is just for testing. We do quite a lot of automated testing on a WebService level. BTW, we did NOT abandon GUI automation, although my answer here may sound like we did. Of course not, we need it, but we are always trying to test the feature below the UI if possible. The API-Tests run on a daily basis and can therefore act as an early warning system. Something the big amount of UI scripts cannot do for us.

Of course, you always have to do the sort of testing / test automation that is appropriate for your needs and your situation, but at least you may think about the alternative of testing somewhere else than the UI.

TOJZ

My cartoon about this topic was also published at the "The Testing Planet" Magazine (March 2011)

Robots Learning Negative Testing

Also published at the "Automated Software Testing Magazine", Issue March 2011