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What is Mockito and why is it used in unit testing?

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Mockito is a popular Java mocking framework used for unit testing. It allows developers to create mock objects that simulate the behavior of real objects in a controlled way. The main purposes of Mockito are:

  • Isolation: Test classes in isolation by mocking their dependencies
  • Control: Define specific behaviors for method calls during testing
  • Verification: Verify that certain methods were called with expected parameters
  • Speed: Avoid expensive operations like database calls or network requests

Mockito helps create fast, reliable, and focused unit tests by eliminating external dependencies.

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