[EOSIO/eos] Did someone build the unit tests alone? (#5323)

Yes, it’s driving me crazy.
I’m trying to code a contract in a TDD way.
And I’m following the code in unittests folder.
Because my failure to build the unit test alone,
Now the only solution I came up with seems to be that put the test in the unit tests folder, and build the whold project every time I add some new code. 😹