There are acceptable and standard procedures for testing and quality assurance in Data Vault, including DV2. My thoughts are as follows:
it's no different than QA testing of standard data models - follow the best practices here (in terms of table structures and referential integrity, etc..)
it's no different than testing standard ETL and ELT routines
It's no different than best practices for reconciling and balancing business data and raw data back to the source systems.
That said: let me shed a little insight: AnalytixDS.com (my partners) have an Automated Test Suite engine / software, and using that software with Mapping Manager, you can automate your test cases against staging, data vault warehouses, star schema's and even Big Data / Hadoop storage.
Ok - here are a few of the tests I generally setup and run:
Data Structure Validation - ensure PK is unique and enforced on all tables, ensure FK is enforced and not broken, ensure there are no orphan records, ensure the business keys in the data vault hubs are unique and enforced, ensure the business key surrogate combinations are enforced and unique in the link structures -
ALL of these types of tests can be automated with STATIC test data and static test cases.
Structure Validation - THESE tests should be run as reports in your data modeling tool, standard queries like "two parents, cycle relationships, missing PK's, naming conventions, etc..." but, you can also run these against the metadata catalogue in the database too.
Process Validation - Again, the question is: are the source fields mapped properly to the targets? AND on the way out, are the aggregations correct? the joins correct? the calculations correct? the business rules correct? Are errors handled properly? Are DELTA processes working? Are Hash Key calculations working?
ALL of these tests as well, can be automatically generated, using STATIC data sets.
The "tricks" if you really want to know, are in developing the DATA SET TEST CASES / Static source data, to run - and then determining how to measure the results of the test.
Again, check out http://AnalytixDS.com and their Test Manager tool. I think you'll be pleasantly surprised.