What is the specificity of integration testing compared to regular functional testing?

Integration testing differs from functional testing in that it verifies the interaction between components or systems, rather than individual functions or modules.

Main features:

• Checks the correctness of data exchange between services, databases, APIs, and other external systems.
• Important to test scenarios where errors may occur due to data format mismatches, delays, network failures.
• Often requires setting up test environments, simulating external services (mocks, stubs).
• The goal is to ensure that components work together as a whole, not just individually.

For example, while functional testing verifies that a method returns the correct result, integration testing verifies that data received from an external API is processed and stored correctly in the database.