Do you know how important the stage of testing is when you building a web application? It is what will give you a product that is efficient, scalable and responsive and in line with your needs. In this article, we will explain how web applications are tested and what methods are used to do it.

Why are applications tested?

Web application testing is used to:

  • evaluate the project from a qualitative point of view,
  • check if there are any errors within the application, and if there are, describe them describe them accurately enough for a programmer to remove them quickly and effectively,
  • suggest corrections in software, thanks to which application will workmore efficiently.

It is crucial to check whether the requirements related to UX are met, i.e. the total experience of the user during contact with the application, and whether it it is based on UI principles, which concern interface design, graphics and animations user-friendly.

Such goals can be achieved only if the tester collects sufficient data about the web application. This includes technical specification of modules, graphic design, external links or additional requirements of the Client.

The entire testing process consists of many steps. It runs from the beginning of application development to its production implementation. It is performed continuously in order to quickly remove errors and implement improvements.

Web application testing by developers

When implementing particular functionalities, programmers perform manual tests.
They consist in checking the correctness of the code manually. In addition, unit tests are performed. What do they consist in? They are used to verify correctness of single code elements, such as functions, methods or objects. They are code executing other code under controlled conditions. They run automatically toverify that parts of the application work as expected.

Manual and unit tests implemented by developers have many limitations.
These include the fact that:

  • they are very time- and cost-intensive,
  • by means of them it is checked if the code works as the programmer assumed, and not, for example, taking into account the needs of the target group,
  • the test often proves that no errors have been found, but it does not guarantee that such errors do not exist,
  • when testing a feature (functionality, option), the programmer knows exactly how it works, which makes it difficult for him to find errors.

Despite some disadvantages, unit tests are needed – they are used not so much to eliminate bugs, because it is it is difficult, but rather to reduce the risk of regression, i.e. breaking the previously working working code.

In addition to unit testing, developers also use testing:

  • static – consists of using tools such as eslint (enables correction of typos in the code) or phpcs (detects deviations from the code development standard),
  • integration testing – verifies the correctness of interaction between specific code,
  • end to end (e2e) – control of individual functions and tasks, such as adding comments by users.

Checking the application by the tester

After the application is built and unit tests are performed, it is handed over to a professional tester. The professional tester performs manual tests, during which all the important functions of the product are checked. Test scenarios are prepared and reports are generated, but this is done manually, i.e. without special software.

Manual testing of web applications has many advantages. It allows you to:

  • obtaining accurate feedback,
  • solving complex problems,
  • Reducing time and costs connected with testing – there is no need to write special script

However, manual testing has several disadvantages. The most important concerns human errors, which when introduce can negatively influence the quality of testing. Moreover, such tests cannot be automatically saved in order to be later replayed or it can be done, for example, with MTM, Microsoft Test Manager, but it requires additional work on the part of the tester.

Therefore, automated tests are also carried out. They are based on special scripts and software, such as Sahi, which is useful in case of in case of web applications. They are based on scenarios that compare the obtained results with the expected results. Automated testing allows you to take into account many factors and get accurate data quickly. It is a monitored process monitored, therefore enabling subsequent analysis.

Types of tests and tools used to test applications web applications

Application control includes different types of testing:

  • functional – can penetrate the source code, among other things when testing object that depends on other objects; examples include checking the correct displaying of graphic elements,
  • non-functional – allows to obtain data concerning properties of the whole system or specific system or specific modules,
  • usability – verification of product compliance with the assumed objectives and user requirements,
  • performance – verification of application performance under load, including at the limits of resources (overload tests) overloading tests,
  • Security – verification of the level of protection against cyber threats,
  • maintainability – checking how easy it is to modify the product and adapt it to new requirements.

Testing the front-end, or the application interface, is of great importance. It is more complex process It is more complex process in comparison to back-end verification, because it includes checking The process is more complex in comparison to the back-end verification, because it checks if every single, independent part of the code works correctly and if it is consistent with the user needs. In this respect, UX is taken into account, which, due to the varying requirements of the audience, often causes difficulties.

Testing of web applications can be based on many tools. Test runners such as Mocha, Karma or Jasmine are popular, as well as the Selenium framework, which is separated from the application and allows to verify the frontend, including the Javascript code, using a browser. Programmers also often use Behat, which allows to implement the BDD (behavior-driven development) approach. In its framework, it is crucial to learn the diverse expectations of users in different contexts and then fulfill them within the application. Behat tests have their own meta-language, i.e. Gherkin, and are used at each stage of product development. They are based on keywords, that express the needs of the audience.

Tests are an integral part of building an application. They allow to check the correct code, thanks to which the final product is efficient and all its all its elements. It is important to diversify tests, so that they were performed not not only by programmers, but also by professional testers.