Its Integration testing
There are 2 types of requirements 1.Functional Requirements
2.Non-Functional Requirements
The load,stress and recovery are testing the performance of 
the application and fall under the Non-Functional 
Requirements testing
The Integration tesing is to insure that when the different 
modules are connected together there is correct data flow 
between the modules and all the modules are functioning 
correctly hence this falls under the functional requirements