The Agile movement has brought some positive practices to software development processes. I am a huge fan of frequent communication, of delivering working software iteratively, and strong customer involvement. Of course, before “Agile” became a movement, a self-congratulating community, and a fashionable term, there were companies following “agile” practices. Years ago I worked for a startup with a CEO who was obsessed with iterative development, frequent communication and customer involvement. The Open Source movement was an influence on us at that time, and today we have the Agile movement helping create a shared language and a community of practice. We certainly could have used principles from Scrum and XP back then.
This software business involves trade-offs though, and for all the good we can get from Agile methods, vocal members of the Agile community have done testing a great disservice by emphasizing some old testing folklore. One of these concepts is “automate all tests”. (Some claimed agilists have the misguided gall to claim that manual testing is harmful to a project. Since when did humans stop using software?) Slavishly trying to reach this ideal often results in: Reckless Test Automation. Mandates of “all”, “everything” and other universal qualifiers are ideals, and without careful, skillful implementation, can promote thoughtless behavior which can hinder goals and needlessly cost a lot of money.
To be fair, the Agile movement says nothing officially about test automation to my knowledge, and I am an enthusiastic supporter of the points of the Agile Manifesto. However, the “automate all tests” idea has been repeated so often and so loudly in the Agile community, I am starting to hear it being equated with so-called “Agile-Testing” as I work in industry. In fact, I am now starting to do work to help companies undo problems associated with over-automation. They find they are unhappy with results over time while trying to follow what they interpret as an “Agile Testing” ideal of “100% test automation”. Instead of an automation utopia, they find themselves stuck in a maintenance quagmire of automation code and tools, and the product quality suffers.
The problems, like the positives of the Agile movement aren’t really new. Before Agile was all the rage, I helped a company that had spent six years developing automated tests. They had bought the lie that vendors and consultants spouted: “automate all tests, and all your quality problems will be solved”. In the end, they had three test cases developed, with an average of 18 000 lines of code each, and no one knew what their intended purpose was, what they were supposed to be testing, but it was very bad if they failed. Trouble was, they failed a lot, but it took testers anywhere from 3-5 days to hand trace the code to track down failures. Excessive use of unrecorded random data sometimes made this impossible. (Note: random data generation can be an incredibly useful tool for testing, but like anything else, should be applied with thoughtfulness.) I talked with decision makers and executives, and the whole point of them buying a tool and implementing it was to help reduce the feedback loop. In the end, the tool greatly increased the testing feedback loop, and worse, the testers spent all of their time babysitting and maintaining a brittle, unreliable tool, and not doing any real, valuable testing.
How did I help them address the slow testing feedback loop problem? Number one, I de-emphasized relying completely on test automation, and encouraged more manual, systematic exploratory testing that was risk-based, and speedy. This helped tighten up the feedback loop, and now that we had intelligence behind the tests, bug report numbers went through the roof. Next, we reduced the automation stack, and implemented new tests that were designed for quick feedback and lower maintenance. We used the tool to complement what the skilled human testers were doing. We were very strict about just what we automated. We asked a question: “What do we potentially gain by automating this test? And, more importantly, what do we lose?” The results? Feedback on builds was reduced from days to hours, and we had same-day reporting. We also had much better bug reports, and frankly, much better overall testing.
Fast-forward to the present time. I am still seeing thoughtless test automation, but this time under the “Agile Testing” banner. When I see reckless test automation on Agile teams, the behavior is the same, only the tools and ideals have changed. My suggestions to work towards solutions are the same: de-emphasize thoughtless test automation in favor of intelligent manual testing, and be smart about what we try to automate. Can a computer do this task better than a human? Can a human do it with results we are happier with? How can we harness the power of test automation to complement intelligent humans doing testing? Can we get test automation to help us meet overall goals instead of thoughtlessly trying to fullfill something a pundit says in a book or presentation or on a mailing list? Are our test automation efforts helping us save time, and helping us provide the team the feedback they need, or are they hindering us? We need to constantly measure the effectiveness of our automated tests against team and business goals, not “percentage of tests automated”.
In one “Agile Testing” case, a testing team spent almost all of their time working on an automation effort. They had automated user acceptance tests, and were trying to automate all the manual regression tests to speed up releases. One release went out after the automated tests all passed, but it had a show-stopping, high profile bug that was an embarassment to the company. In spite of the automated tests passing, they couldn’t spot something suspicious and explore the behavior of the application. In this case, the bug was so obvious, a half-way decent manual tester would have spotted it almost immediately. To get a computer to spot the problem through investigation would have required Artificial Intelligence, or a very complex fuzzy logic algorithm in the test automation suite, for one quick, simple, inexpensive, adaptive, yet powerful human test.
In another case, developers were so confident in their TDD-derived automated unit tests, they had literally gone for months without any functional testing, other than occasional acceptance tests by a customer representative. When I started working with them, they first defied me to find problems (in a joking way), and then were completely flabbergasted when my manual exploratory testing did find problems. They would point wide-eyed to the green bar in their IDE signifying that all their unit tests had passed. They were shocked that simple manual test scenarios could bring the application to its knees, and it took quite a while to get them to do some manual functional testing as well as their automated testing. When they did, I saw a marked improvement in the code they delivered once stories were completed.
In another “Agile Testing” case, the testing team had put enormous effort into automating regression tests and user acceptance tests. Before they were through, they had more lines of code in the test automation stack than what was in the product it was supposed to be testing. Guess what happened? The automation stack became buggy, unwieldly, unreliable, and displayed the same problems that any software development project suffers from. In this case, the automation was done by the least skilled programmers, with a much smaller staff than the development team. To counter this, we did more well thought out and carefully planned manual exploratory testing, and threw out buggy automation code that was regression test focussed. A lot of those tests should never have been attempted to be automated in that context because a human is much faster and much superior at many kinds of tests. Furthermore, we found that the entire test environment had been optimized for the automated tests. The inherent system variablity the computers couldn’t handle (but humans could!) had been attempted to be factored out. We did not have a system in place that was anything close to what any of our customers used, but the automation worked (somewhat). Scary.
After some rework on the testing process, we found it cheaper, faster and more effective to have humans do those tests, and we focussed more on leveraging the tool to help achieve the goals of the team. Instead of trying to automate the manual regression tests that were originally written for human testers, we relied on test automation to provide simulation. Running simulators and manual testing at the same time was a powerful investigative tool. Combining simulation with observant manual testing revealed false positives in some of the automated tests which had to been unwittingly released to production in the past. We even extended our automation to include high volume test automation, and we were able to greatly increase our test effectiveness by really taking advantage of the power of tools. Instead of trying to replicate human activities, we automated things that computers are superior at.
Don’t get me wrong – I’m a practitioner and supporter of test automation, but I am frustrated by reckless test automation. As Donald Norman reminds us, we can automate some human tasks with technology, but we lose something when we do. In the case of test automation, we lose thoughtful, flexible, adaptable, “agile” testing. In some tasks, the computer is a clear winner over manual testing. (Remember that the original “computers” were humans doing math – specifically calculations. Technology was used to automate computation because it is a task we weren’t doing so well at. We created a machine to overcome our mistakes, but that machine is still not intelligent.)
Here’s an example. On one application I worked on, it took close to two weeks to do manual credit card validation by testers. This work was error prone (we aren’t that great at number crunching, and we tire doing repetitive tasks.) We wrote a simple automated test suite to do the validation, and it took about a half hour to run. We then complemented the automated test suite with thoughtful manual testing. After an hour and a half of both automated testing (pure number crunching), and manual testing (usually scenario testing), we had a lot of confidence in what we were doing. We found this combination much more powerful than pure manual testing or pure automated testing. And it was faster than the old way as well.
When automating, look at what you gain by automating, and what you lose by automating a test. Remember, until computers become intelligent, we can’t automate testing, only tasks related to testing. Also, as we move further away from the code context, it usually becomes more difficult to automate tests, and the trade-offs have greater implications. It’s important to make considerations for automated test design to meet team goals, and to be aware of the potential for enormous maintenance costs in the long term. Please don’t become reckless trying to fulfill an ideal of “100% test automation”. Instead, find out what the goals of the company and the team are, and see how all the tools at your disposal can be harnessed to help meet those goals. “Test automation” is not a solution, but one of many tools we can use to help meet team goals. In the end, reckless test automation leads to feckless testing.