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JUnit / Mockito Interview Questions

Why do we need mocking in the Unit testing?

There are many use cases of mocking needed to perform unit testing of the code under isolation and make the test highly repeatable and predictable.

Mocking is generally required when,

  • Component shouldn't update the state in the system during unit testing. For example, saving data to the database will alter the state, so during unit testing, DB calls could be mocked in the component under test.
  • When the implementation of certain API/libraries/dependency is unavailable, we can mock those to pretend that it is available. For instance, assume we are consuming a REST API that provides a list of stock. While the REST API implementation is in progress, we can simply mock the REST API so we get the list of sample stocks.

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