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How to test a mobile app to rule out all bugs?

Testing a mobile application is an important stage in the development and deployment process.

It consists of several stages to ensure that the app works properly, is stable and provides a positive user experience. Here are the main stages of mobile app testing:

Test planning: the first step is test planning, in which the objectives, test strategy and scope and priorities of testing are defined. Test documentation is created, which includes details of test cases, test scenarios and the test environment.
Unit tests: unit tests focus on verifying that the various components and modules of an application work properly. Developers run these tests to ensure that the application code is bug-free and works as expected.

Functional testing: functional testing focuses on verifying that the application performs certain functions as intended. Various application usage scenarios are tested, as well as user interface interactions, forms, navigation, business logic and other functionality.
User interface (UI) testing: UI testing focuses on verifying that the user interface is intuitive, visually appealing and follows design guidelines. Elements such as screen layout, buttons, text boxes, colors, fonts, animations and interface responsiveness are checked.

Compatibility tests: Compatibility tests are designed to verify that the application works properly on different mobile devices, different versions of operating systems (iOS, Android) and different device configurations (resolution, screen size, etc.). Different versions of web browsers are also tested, if the app is available as a web application.
Performance tests: Performance testing examines how an application behaves under load, under conditions of large numbers of users or resource-intensive operations. Response times, resource consumption, stability and application performance under various load scenarios are tested.

Security tests: Security tests check an application's resistance to attacks, attempts to violate user data privacy or vulnerabilities to cyber threats. Various aspects of security are tested, such as data encryption, authentication, access permissions, protection against XSS (Cross-Site Scripting) or SQL Injection attacks.
Usability tests: Usability tests evaluate the application's user-friendliness, intuitiveness and ease of use. User reactions and opinions are examined with regard to navigation, ease of use of features, clarity of messages and overall user experience.
Acceptance testing: Acceptance testing is performed by end users or principals to assess whether the application meets their expectations and is ready for deployment. Features, quality, performance and compliance are checked.
Reporting and corrections: Based on the test results, a report is created containing information about bugs found, shortcomings or suggestions for improvements. Based on this, application developers make corrections, fix bugs and optimize application performance.

Testing a mobile app is an iterative process that often requires repeated steps until the optimal quality and functionality of the app is achieved. It requires diligence, regularity and cooperation between the development team, testers and users.

How to test a mobile app to rule out all bugs?

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