This updates the organization policy tests to be run sequentially,
instead of in parallel, as they share a resource that they're modifying.
It also updates them to use a separate organization than the one all our
other tests are running in, which prevents other tests from failing
because they're run in parallel to the organization policy changing
under them.
Previously, provider credentials were _supposed_ to be able to be
specified as the file contents or the path to the file. We even had a
test for the code for this!
Then we updated the validation for the provider, and forgot to validate
filepaths as ok. So provider validation failed. And because our test
only tested the config validation, and not the provider validation, our
tests thought this was just fine still.
This fixes that oversight, accepting filepaths as valid. It also adds
tests to ensure that provider validation allows both file paths and
contents.
Since this variable is only used for 3 tests, it doesn't make sense
to declare it as mandatory in the test config. Therefore, concerned tests
are now skipped if the variable is absent.
This change adds another option for supplying authentication credentials
to acceptance tests: If GOOGLE_USE_DEFAULT_CREDENTIALS is set, the default
credentials are used. When run from a compute engine instance, the compute
engine default credentials are used. When run from the user's workstation,
the user's credentials are used, if the user has authenticated with the
GCloud CLI beforehand.
