After deploying an application, a series of tests can be performed on the environment. One of the tests executed here is a functional test. Functional tests are primarily aimed at validating the feature completeness and functionality of the application. These tests are written from requirements gathered from the customer. Another set of tests that can be executed is related to the scalability and availability of the application. This typically includes load tests, stress tests, and performance tests. It should also include an operational validation of the infrastructure environment.