Examples of the present disclosure describe a testing framework for adaptive virtual services. In an example, a function vendor provides a network function having stated specifications to a service provider. A derived signature is generated for the network function (e.g., based on associated metadata, an image associated with the network function, and/or a network signature for the network function), which is used to classify the network function. The testing framework is used to test the network function according to its classification, thereby determining a set of capabilities. In examples, a network function having the same or similar signature as a previously tested network function may be categorized according to the previously tested network function. The network function is categorized according to its determined capabilities and added to an inventory of network functions for the service provider. Network functions in the inventory can then be selected to form a computer network.