Model-based testing MBT: quick overview

Model-based testing (MBT) is an approach to software testing that requires developers to create a second, lightweight implementation of a software build called a model. Typically, a model consists of business logic and is just a few lines of code. Another program, called the driver, sends the same information to the software under test (SUT) and the model and then compares the input results to make sure they are the same.

what is model-based testing

TestIt test optimization relies on information gathered during previous test execution in exploration mode. The optimized test forms a test scenario with a goal to maximize some criterion (e.g., code coverage, robot-specific measurement value such as localization uncertainty). In order to improve the test scenarios, the test traces should be as concise as possible without losing valuable data due to compression. The addition to this workflow presented in this chapter allows the test cases to be compressed (i.e., clustered) so that the test optimization can focus on salient points in the state space.

Implementing model-based testing can’t be introduced suddenly to a system, as it has to be done gradually. It will be too much to introduce it to the entire system’s processes and operations. Most software developers and teams find it challenging to create and update test cases in an environment of constantly changing dependencies and requirements.

How it’s Different from UI Testing

Another approach has been to adopt formalisms originally used to develop systems, such as UML. Of course, it is also possible to develop a new formalism just for MBT. However, introducing this approach to large company processes can be a big challenge, especially when it involves overhauling their entire approach to software development and testing. Basically we know what model-based testing is now, and we already figured out the benefits of using it over using the traditional testing method. Then you can automatically generate test cases based on the models once they are done creating it.

The relations between model, the tester, and system under test (SUT) can be seen in Fig. An MBT tool supports the test life cycle and interacts with other development phase elements as depicted in Fig. Test generation algorithm is better covered elsewhere and omitted here. MBT is already known for several years, but it currently gains a great momentum due to advanced tool support and innovative methodological approaches. In Section 2 we give an overview on the state of the art of methodologies in MBT.

One such new area of test automation would be Windows Phone in the near future. MBT Modeling, gives an overview of modeling languages used in MBT and guidelines for creating MBT models, as a core activity in an MBT approach. Model-based testing can go a long way in testing and save significant time and effort when implemented properly. Model-based testing has to become a part of the development workflow, but this comes with its own challenges, including changes to the entire infrastructure. It also makes an already steep learning curve even more challenging.

  • Model-based testing is a software testing technique that uses a model to generate tests.
  • If the application does one thing well, perhaps interacting with a database, a model, drivers, and some sample input could be all that is required to test the application.
  • As a result, the need for comprehensive and reliable test automation has never been greater.
  • Simply speaking model-based testing is a testing technique when we define an abstract model which describes a software behaviour and then use this model to test the real software.
  • Instead of many test cases full of text, we have a visualisation of software behaviour.

Model-based testing is a software testing technique where the run time behavior of the software under test is checked against predictions made by a model. Behavior can be described in terms of input sequences, actions, conditions, output, and flow of data from input to output. It should be practically understandable and can be reusable; shareable must have a precise description of the system under test.

A high level guide of setting up quality gates in software development process

Once it is fixed by developers, it has to be changed to status Fixed. State charts should be designed in such a way that it should call for an event for each state.

UI testing can be employed in any stage of the product as it clearly doesn’t have much requirement and the learning curve is very easy compared to MBT. It’s best fitted for the initial stage of the product, as things are still very minute. It’s easy to integrate with the system requirements then, because as things get bigger you get to update just the model. This model helps testers to assess the result depending on the input selected. Various combinations of the inputs can result in a corresponding state of the system.

Static models are typically used for GUI testing, while dynamic models are used for API testing. This testing can be applied to both hardware and software testing. Constraint programming can be used to select test cases satisfying specific constraints by solving a set of constraints over a set of variables. A solution found by solving the set of constraints formulas can serve as a test cases for the corresponding system.

Therefore, MBT is an excellent technique to increase coverage through more diversified test scenarios. It can also be used to quickly understand legacy systems without having to deep dive into the code specifics. After we build out our model, we use a tool to generate a skeleton for our test automation code.

what is model-based testing

An appropriate solution is to consider only the inner or test states. Model based testing is very familiar for the test cases are performing actions in same sequence or not? This testing technique is adopted and integrated with the testing techniques. A number of business tools are developed for supporting this type of technique now-a-days. The TEMA approach is to create process algebraic models to describe how the SUT is used.

what is model-based testing

One needs to follow the documentation and rules strictly when using Model Designer. If the task of designing a model is simple and understandable, the extra cost of managing the modeling part can be minimized. This is because model creation and execution can be efficient if the testers possess some skills of test scripting and automation beforehand. This means, therefore, that testers without these skills need training to perform model creation, and it can be difficult to find people with those skills already.

what is model-based testing

Test cases derived from such a model are functional tests on the same level of abstraction as the model. These test cases are collectively known as an abstract test suite. An abstract test suite cannot be directly executed against an SUT because the suite is on the wrong level of abstraction. An executable test suite needs to be derived from a corresponding abstract test suite.

test model meaning

The application of MBT to support a V-model SDLC (see Fig. 1) can be interpreted as part of a systems engineering framework (Blanchard et al., 1990), which provides means for system development using a SDLC. Particularly, the domain of model-based systems engineering (MBSE), which includes MBT, is becoming increasingly popular. MBT of CPSs as considered in the remainder of this chapter can be seen as part of the verification activities. However, in order for SysML to utilize such techniques, transformations are required to exploit external (model) simulation environments such as Modelica (Modelica Association et al., 2005).


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