What are the types of testing?

Functional Testing: Verification of the application's behavior against requirements. Includes:

• Unit Testing: Testing individual components (functions, classes). Usually performed by developers.
• Integration Testing: Testing the interaction between two or more modules.
• System Testing: Testing the system as a whole, as a single entity.
• Regression Testing: Ensuring that new changes have not broken existing functionality.
• Acceptance Testing: User or customer testing to confirm compliance with requirements.

Non-Functional Testing: Verification of non-functional characteristics such as performance, reliability, usability. Includes:

• Performance Testing: Checking response speed, stability under high loads. Includes load testing, stress testing, stability testing.
• Security Testing: Identifying vulnerabilities and security risks.
• Usability Testing: Assessing the ease and convenience of using the application.
• Compatibility Testing: Checking operability across different platforms, browsers, devices.

Change-Related Testing:

• Smoke Testing: Quick check of basic functionality after build or deployment.
• Sanity Testing: More detailed check of new functionality after minor changes or bug fixes.

Structural Testing (White-Box Testing): Testing internal structure and logic of the code. Requires knowledge of implementation.

Experience-Based Testing: Testing based on tester's experience and intuition. Includes exploratory, ad-hoc testing.