Writing tests for our application ensures reliability, but unit tests are not enough; integration tests are crucial to verify how different parts of the system work together.
Integration tests check the interaction between components; for example, testing whether the AuthenticationService correctly hashes a password and returns a user account as expected.
While unit tests evaluate individual units, integration tests are essential for exposing the potential issues between interacting components, ensuring the system operates smoothly as a whole.
To conduct effective tests, we must avoid using the actual database and mock dependencies, such as the bcrypt hashing library, to provide consistent results in our tests.
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