What is the main purpose of using mocking in unit testing?

To simulate the behavior of external dependencies
To improve code readability
To optimize code execution
To enforce code standards

Mocking in unit testing is primarily used to simulate the behavior of external dependencies, such as databases, APIs, or services, so that the unit being tested can be isolated and tested in isolation. This helps ensure that tests focus on the unit's logic without relying on the actual external dependencies.

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