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In software development, we often talk about unit testing
and integration testing as the foundation of quality
assurance. But one piece that truly bridges the gap between
the two is API testing.
Here’s how it fits into the bigger picture:
Unit tests ensure individual functions or modules behave
correctly.
Integration tests check how different parts of the system
interact.
API tests validate the communication layer—the contracts,
data exchange, and reliability between services.
For example, a unit test might confirm that a function
calculates a price correctly, while api testing ensures that
when this price is requested via an endpoint, it returns the
right value, in the right format, under the right
conditions. Similarly, while integration testing checks if
services connect, API testing validates how they connect and
respond to real-world scenarios like invalid data, network
latency, or unexpected client behavior.
When combined, unit, integration, and API testing create a
layered safety net. This approach reduces blind spots,
shortens debugging cycles, and ultimately results in more
resilient applications.
