That is the actual mutation that is written into your source code base. Maybe it's greater than 18, or maybe it will be driver age is greater than 1, or maybe it'll just return true or return false, any of those kind of things. The mutation testing tool will now change that action, change your code, and mutate it to say, driver age is less than 18. You write a simple conditional, driver age is greater than or equal to 18. Let's say you have a simple Boolean condition where you're checking the driver must be 18 years old and above and therefore, able to drive. There's all kinds of mutants, mutations of logic, there's mutations of raw code, a whole bunch of different kinds. There's a lot of different types of mutants, and we can get into some of those later. Can you give us an example of what a mutant is?īill: Sure. You mentioned automatically inserting small bugs in code called mutants. In short, it's a method to find out how much trust you can place in your existing test suite, and it's a way of saying, how do you test your tests for effectiveness? Now, the higher number of the mutants killed and the fewer mutants that escaped, we say the more effective your tests are. If the test suite still passes, even though your code has been mutated, we say that mutants survived. If your test fail, then the mutant that was put into the code is termed as being killed. Briefly, the idea is that if you alter or mutate your code, your tests suite should now fail if that test suite is complete. The existing test suite you have is just re-run for each mutant, or some combination of mutants. Mutation testing is, it's a white box testing method, which works by automatically inserting small bugs called mutations in your code, and then running the existing test suite. One of the questions is, how do you know if those tests you've written are any good? Remember that traditional test coverage tells you the percentage of code that is executed during the test, but not if the tests actually detect faults in that code. Your test coverage is high, and you have a great deal of confidence in that test suite. Imagine you have this nice code base, and you're using TDD for the most part, and maybe the code base has been extended and modified for some number of months or years, and now you built up this nice suite of tests alongside the code and it passes happily every time you commit. First, I'd like to just set the scene quickly. First things first, Bill, can you quickly tell us what mutation testing exactly is in plain English?īill: Sure. We'll talk about what it is, why software teams should be looking to adopt this practice, and everything else there is to learn about it. Today, our topic, as I said, is about mutation testing. Thanks, Bill, and Brian for that introduction. I love technology, and mutation testing is one of what I feel is one of the key tools to giving you quality. I've been at Thoughtworks about eight years. I've been using mutation testing for years on projects and advocating adoption of the practice as a sensible default for testing. I've been with Thoughtworks for about seven years, working out of the San Francisco office. I'm a technical principal with Thoughtworks. Do you want to quickly introduce yourselves?īill Codding: Sure. Today, we are going to be also joined by two of our colleagues, Bill Codding and Brian Oxley to talk about mutation testing. I'm also one of the new co-hosts on the Technology Podcast. swf files.Prem Chandrasekaran: Hello, and welcome everyone to the ThoughtWorks Technology Podcast. In other words I only did some repackaging of the. swf file off some flash games portals and then repackaged the. The above mentioned flash game is made by other people and not me. Please take note that I did not make the above mentioned flash game. html file with a web browser (Google Chrome, Mozilla Firefox, Internet Explorer, etc) to play the above mentioned flash game. Played any of The Several Journeys Of Reemus before? Enjoyed them? Yes? No? Why? Good graphics, normal point and click adventure flash game. The death slug has a lust for blood and kills all in its way. What will happen to the dumb pussy cat?ĭeath slug entered the cat from behind and blew up the cat. The frog ate the death slug and the death slug exploded from within. See the little meteor rock floating in the water? See the tiny maggot above it? Death slug! Please contact Deimos if one of the links is broken or there is an updated version. The death slug can enter various organic beings, blow them up from inside and assume their form.Ĭlick the download icon at the top right corner to start the download. The Visitor is a point and click adventure flash game about the journey of a death slug from outer space, made by Zeebarf, the same developer who made The Several Journeys Of Reemus series. The Visitor – Flash Games Download – Overview
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