Unit tests are essential for the development process as they aid in adding new features and refactoring existing code. They focus on individual components, utilizing tools like mocks, spies, and data providers to improve efficiency. Effective unit testing targets important areas and specific methods to ensure robust software quality.

1. Testing is
coming

2. What is UnitTests

3. Help in development
• Adding new features
• Refactoring

4. Tested unit
• Size
• Important areas for testing
• Group of methods
• Input data

5. What is the unit tests
• Mock
• Spy
• DataProvider
• ArgumentCaptor