When writing unit tests, why is it advised to mock external dependencies?

Mocking external dependencies ensures that unit tests run faster.
Mocking external dependencies helps isolate the code being tested and ensures tests focus only on the specific unit.
Mocking external dependencies allows unit tests to access real data from external services.
Mocking external dependencies is not advisable in unit testing.

It's advised to mock external dependencies in unit testing to isolate the unit being tested and not rely on the behavior of external services or dependencies. This ensures that unit tests are reliable and that any failures are indicative of issues within the unit itself.

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