Without any .go file that doesn't end in _test, it fails:
no buildable Go source files in [...]/integration/tests/healthz
An empty source file works around this.
These tests are similar to Go unit tests except that they're targetting
tesing of a running cAdvisor client. They do this by interacting with
the testing framework that is able to talk to the running cAdvisor. This
cAdvisor could be local or remote.
