Can you explain what is meant by integration testing and how it differs from unit testing?

Integration testing verifies the interaction between multiple modules or components of a system to ensure they work together correctly. Unlike unit testing, which focuses on testing individual functions or classes in isolation, integration tests check the connections and data exchange between modules.

For example, if you have an authentication module and a user profile module, an integration test will verify that after a successful login, the profile data loads correctly, not just that each module works separately.

Thus, unit testing helps identify errors within a specific component, while integration testing detects errors in the interaction between components.