Functional testing — all testers, whether experienced masters or beginners, come across this concept every day. We cannot release a product, hand it over to a customer, or approve it if it has not passed functional testing.
But the critical importance of such testing is only half the battle. Sometimes a team cannot cope with a massive volume of work, plus the human factor always occurs. Therefore, together with the mandatory functional testing, we get another question — its automation.
Table of Contents
Importance and Significance of Functional Testing
In essence, functional testing is aimed at checking the conformity of the functional requirements of the software to its actual characteristics.
So, its main task is to confirm correspondence of the product’s functionality to the customer’s requests. We check the functions for which we created the program through functional testing.
Testers use three main types of automated functional testing, depending on the access to the system code.
Main types of functional testing
Functional testing is done for different purposes. For example, it can be carried out based on functional requirements (to identify the correct operation) or based on business tasks (emphasis on use-cases).
Depending on the specific task required, we use different automated functional testing types:
- Regression testing. Testing product functionality after fixing bugs or implementing new functionality
- Integration testing. Testing interactions between system components and between multiple systems.
- Smoke testing. A short cycle of tests to determine the correct operation of the main app’s functions.
- Sanity testing. Somewhat similar to smoke testing with the difference that it’s suitable for web apps.
- System testing. Software compliance verification with the requirements stated in the specification
- Cross-browser testing. It is useful when your app is already developed and ready for release; such testing checks how convenient it is for users to visit different browsers.
- Installation testing. It is needed when we have to check the installation process’s correctness and safety.
- Configuration testing. Checking the program operation on various software and hardware environments
One more functional testing type is manual testing. It fully simulates the actual use of the system by the end-user. There are also a few no less important functional testing types that are actively used.
Why is functional testing automation so important?
Speed and efficiency are two fundamental ingredients of a successful business. And no one wants to sacrifice one thing for the other. However, automation has always been a step towards keeping these two items in balance.
Thus, automated functional testing has several advantages:
- Repeatability: all written tests will always be executed in the same way, according to a given code.
- No human factor: The tester will not negligently skip the test and confuse the results.
- Fast execution: the automated script does not need to consult instructions and documentation; this greatly saves execution time.
- Fewer support costs: when automated scripts are already written, they take less time to maintain and analyze the results than doing the same amount of manual testing.
- Reports: they are saved and sent automatically.
- Non-intrusive execution: While the tests are running, the test engineer might be doing other valuable things. The tests might be running outside of business hours (this method is preferable because LAN load is reduced at night).
In a nutshell, automated functional testing helps save time by avoiding repetitive errors and system crashes. Plus, bugs will be detected at an earlier software life cycle.
Another side of automated functional testing
Of course, it is not a panacea, and it has pitfalls.
Therefore, before deciding whether to use such testing, consider also disadvantages (there are a lot of them too):
- Repeatability: this was a plus but could also be a minus; the script acts strictly according to the scheme, but it cannot pay attention to any suspicious factors, make a decision and make a check.
- Support costs: The more often the application changes, the higher it is.
- High development costs for automated functional testing: This is a complex process since the actual development of an application is testing another application. Complex automated tests also have frameworks, utilities, libraries, etc., and all of this must be tested.
- The cost of an automation tool: it can be especially high if you are using licensed software.
- Skipping minor errors: the automated script can skip minor errors that it is not programmed to check. These can be inaccuracies in the positioning of windows, errors in labels that are not checked, etc.
Therefore, when deciding on such a strategy, ask why you need automated functional testing? It may work fine for some purposes and not be suitable for others.
Automated functional testing purposes
The test process is the highly qualified IT specialists’ intellectual creativity, but it also needs to be carried out systematically to achieve the set goals.
The automated functional testing tools will be an ideal solution for such purposes as:
- Database writing, logging files, backend processes, places in the system that are most difficult to access.
- For quick bugs funding in functionality and ensuring of the absence of them in the system.
- For routine operations. For example, forms with many fields for a dataset (iteration over data). Thus, it can fill in the fields and check them after saving automatically.
- To automate the process of filling in the fields with incorrect data to check various validations.
- For long scripts (end-to-end).
- Testing data that requires accurate mathematical calculations.
- To automate the correctness of data retrieval.
The rest of the functional testing is carried out according to the customer’s requirements or product and tool features. Many tools make the testing process fast and efficient.
Also, the simpler and cleaner the initial conditions were, if no factors were influencing the testing process, this automation would be as fast and efficient as possible.
There are many great tools out there today for specific or complex tasks. Many are open source, do not require a programming language of knowledge, and are very user-friendly. Others are great for particular tasks like cross-browser testing.
An example of a proper automated functional testing tool would be:
- Selenium. One of the best and most flexible tools especially suitable for web app testing. It requires some programming knowledge, but it creates complex and advanced scripts and supports the most popular browsers.
- Cucumber. Fresh in every sense solution, suitable only for web apps. It is an open-source BDD tool with simple functionality.
- JUnit. It is an innovative open-source tool that is optimal for Java developers. It finds bugs operatively, generates test items, methods, mockups. It also has many extensibility points and interfaces that are flexible for changes and implementation.
- TestNG. This tool is widely used in conjunction with Selenium. TestNG easily integrates with other tools, generates HTML reports, groups test cases, and allows parallel tests to be executed using dependencies.
- PlayWright. A promising tool for end-to-end web applications. It provides a unified API for test automation, allows uploading and downloading files, emulating geolocation, mobile apps, permissions, scripting.
- Selenide. Some people consider this a cover of Selenium, but this does not negate the tool’s advantages, namely: a convenient and concise API, working with AJAX elements. It is a good framework for writing easy-to-read and easy-to-maintain automated tests in Java.
- Appium. This is an automated testing app great for hybrid, native, and web apps. Also, Appium is cross-platform and supports desktop apps as well.
- Cypress. Perhaps it isn’t easy to find a more convenient and understandable framework than this one. The intuitive syntax, good documentation, and speed of work are already commendable.
These are just some of the best functional testing tools that simplify the testing process by identifying bugs and improving functionality faster.
It is impossible to call an IT product complete if it has not passed functional testing. It determines how much the software or app is ready for use, in other words, functional.
But given the cost and duration of some test processes, it becomes advisable to resort to functional testing automation.
Automated functional testing is not just a way to speed up the testing process to unload employees and find bugs around the clock. Instead, it solves different problems or several of them at once.
Depending on the required task and specificity, different Automated functional testing tools are used. Some are open source and perform other options; some are optimal for a specific task — testing web app.