API Testing

This article provides a QA engineer’s perspective on API testing. It pulls out some of different types of testing approaches, such as unit testing and black-box testing, and provides some guidance on writing API tests.

• http://www.scribd.com/doc/9808382/Introduction-to-API-Testing

Note that the term “API Testing” is commonly used in the QA domain to mean programmatic black-box tests that a QA engineer writes.  However, I view the topic of “testing an API” as being wider than this, encompassing unit testing, integration testing, and non-functional testing, and performed by either developers or QA engineers.