What types of testing do you implement in your project and what criteria do you use to choose their types?

In the project, I implement several types of testing:

• Unit Testing — for checking individual components and methods using JUnit or TestNG.
• Integration Testing — for verifying interaction between modules, for example, using Spring Test or Arquillian.
• Functional Testing — for testing business logic and user scenarios.
• Load Testing — for assessing the performance and stability of the application under load.

The choice of testing type depends on the goals: unit tests are needed for quick error detection in code, integration tests for verifying component interaction, functional tests for checking requirements, and load tests for evaluating system behavior under real conditions.