How to Automate Regression Testing in Your Project in 10 Steps
1. Identify the changes in the software
At this stage of the process, you need to identify the changes made in the software, as well as their anticipated effect and how much they affect the overall application. There is no change too small to run automated regression tests, but you need to know the extent of the changes brought to the application by the new additions to the code to select the most appropriate strategy and tools.
2. Design the strategy
There are certain ways in which applications are tested for regressions, but there isn’t a universal, one-size-fits-all approach to automated regression testing. Each case is unique and requires different tools and methodologies to achieve the desired results. Ideally, your testing strategy should be designed by someone with plenty of automated regression testing experience — a solid strategy will help you avoid many of the possible pitfalls.
3. Make sure you have enough resources
There are three primary types of resources you will need to successfully launch your automated testing process. Those resources are:
- Time. This is by far the most crucial resource needed to perform regression testing. When you want to bring the product to market, you need to work as quickly as possible. Your reasoning can be different: some software developers want to get an edge over the competition, while others have obligations to their investors. The key thing here is that you don’t want to rush the process and skip certain issues as a result, which means you need to have enough time for testing and retesting.
- Equipment and tools. Unlike compatibility or mobile testing, regression testing does not require a range of devices to be effective. However, you will need a selection of automation tools, and since there are so many of them to choose from, you will need the help of someone with plenty of experience.
- People. Automating regression testing does save the QA team a lot of time, but it’s not something that can be run completely independently. You will need people to outline the testing strategy, execute it using the best practices, and implement the results to increase the quality of your software product.
4. Assemble your team
Some business owners try launching the automated regression testing process with just one QA engineer, but this strategy will almost certainly backfire. At the very least, your testing team should consist of two members: a QA lead, who will be responsible for the big picture, and the engineer, who will run the tests and report on them to the team lead.
However, a team this small will only work for a very small project. The bigger your software product is and the more updates it’s getting, the more your team should grow. For example, you can start by adding another engineer and an industry expert who has substantial experience with the type of service you create.
5. Select the most appropriate test cases
A test case is a roadmap for the QA engineer to check the new version of the software product for regressions. In each automated regression testing strategy, the test cases will be different and will depend on the size, history, and goals of the project. At the very minimum, the test cases for your regression testing strategy should include the areas that are typically affected by bugs, areas that have undergone significant changes due to the new fragments of code, and every area of the product that the end user will interact with.
6. Choose the framework
A vital component in any automated regression testing strategy is the selection of the most appropriate framework, which can include anything from the programming language to the primary and secondary tools to help you along the way. If you already have a well-developed testing framework that has proven to be effective in previous regression tests, you can successfully use it, but in most cases, it will need some tweaking to meet the goals of this particular testing case.
7. Create the test scripts
Automation regression testing is often viewed as a time-saving alternative to manual regression testing. Still, when you plan your automated regression testing strategy, there is at least one time-consuming step — designing the test scripts. Not only do you need to select the most relevant test scripts to get an in-depth understanding of the changes brought to the application, but you also need to update them any time there is a new piece of code added to the product. You can also organize the scripts by importance to make sure the most important ones are given priority.
8. Run the tests
After the often grueling preparation stage, there comes a time when you finally get to execute all the tests you have planned. At this point, you need to make sure that the tests cover every level of the application and give you a complete idea of how the product was affected by the new functionality. While running the tests, you can select the most precise and effective ones and later include them in the final version of your automated regression test suite.
9. Analyze the results
All the planning, preparation, and execution of automated regression tests are done for one reason: to achieve a higher quality of software, detect the bugs or other issues brought by a change in the software, and prevent those bugs from reappearing. This is why, after a significant part of the testing process is over, you need to get to the analysis stage.
A thorough analysis of the results achieved through automated regression tests will help you understand where your product stands in terms of quality, how prone it is to regressions, and what can be done to optimize the regression testing in the future. Pay special attention to the failed tests — they can give you some very valuable insights, provided that it’s not a case of a false failure.
10. Document everything
You can already get a thorough understanding of the possible regressions in your project during the testing and analysis stage, but you need to always keep the big picture in mind. Keeping extensive documentation of automated regression tests helps you set up the future testing process faster, avoid the possible mistakes that were made during this testing iteration, and quickly introduce new QA engineers to the way automated regression testing is done at your company should you ever change the team.
How to Choose the Right Regression Testing Tools
If you’re just getting started with automated regression, more likely than not, you might need help with choosing the right regression testing tools. Below, we’ll take a close look at some of the most popular tools used in software regression as well as shed light on the main criteria that should be considered when making a choice so the tools you choose fit your test management system just right.
Embracing CI/CD pipelines
One of the most important parameters when selecting regression testing tools is the support of CI/CD pipelines. This has become the standard for running various tests, including acceptance and unit tests on every code submission. Tools that support pipeline integrations ensure that automation engineers can work from the same testing platform and detect bugs much quicker, maintaining a unified testing environment.
Simplified scripting
Regression testing is a multi-layered process that is rather complex in itself, but it becomes even more complex as the number of regression tests increases and new features are constantly added to the regression test suite. Therefore, when selecting a regression testing tool, it’s important to consider if it helps make the script-writing process easier.
Effortless test maintenance
Just as regression testing reduces the time and costs required for script creation, it also simplifies maintenance efforts. The key is to use the right tools. With that in mind, when selecting regression testing tools, make sure to look for features that facilitate test maintenance. This can involve intuitive interfaces, robust version control capabilities, and seamless integration with development and testing environments.
Reporting system
Not less important is how good the reporting system of a testing tool is. Ideally, you should be looking for a tool offering a comprehensive view of the metrics important both for a tester and a developer. The tester should be able to track the number of test cases that pass or fail, while the developer should also be able to see the reason why the failure occurred in order to act on it quickly. That’s where it’s best to choose from the tools featuring the list of actions taken during tests. With this kind of tool, you’ll be able to repeat tests and figure out what exactly went wrong, even if the initial test result was a failure.
Parallelization support
Last but not least, a good regression test tool should support parallelization. This is important because regression tests are often executed in thousands, and if you let all your developers run them on a single machine, it’ll take more time than most companies can afford.
Best tools for automated regression tests
Now that we’ve covered what factors to consider when selecting tools for automated regression testing, it’s time to look at the selection of testing tools that are widely used in regression test automation. Here are our top 10 picks: