The present document proposes a model of the NFV test domain and recommends requirements for a test Domain Specific Language (DSL) to manipulate it. The description includes an NFV test automation ecosystem that facilitates interaction among NFV suppliers and operators@ based on the DevOps principles. The NFV test domain contains: ? System Under Test (SUT): Network Functions (NF)@ Network Functions Virtualisation Infrastructure (NFVI) and network services. ? Test Resources: tools or instrumented NF's and NFVI elements that test cases can interface to manipulate the SUT. ? Test Execution Flow: controlled and uncontrolled state transitions. ? Test case configuration data and parameters: test-resource-specific and non-test-resource-specific. The present document explores the following attributes to enable efficient multi-supplier NFV interaction: ? Reusability of test plans@ test cases and test resources. ? Abstraction of test data. ? Decoupling of test case from the test environment. ? Use of test resource abstractions in place of concrete resources