Create a UI integration test case for the design of the ETSI 2.5.1 NFV Network Service design UI integration test:

1. Create an ETSI 2.5.1 NFV Network Service
2. Verify if the default properties are present
3. Edit the default properties value
4. Download the CSAR
5. Check if the CSAR has the NS Package at Artifact/ETSI_PACKAGE folder.
6. Check the NS Package content
   1. If it is a signed package, check for the certificate, signature and NS CSAR.
7. Check the NS CSAR content:
   1. Check the main descriptor content
      1. Check the substitution mappings node type is the same as the main service
      2. Check if there is one node in the node_templates with the same name and type as the main service
         1. check if the node has the default properties and values defined