Fix failing provider RSpec test when running on docker

[juniorsysadmin]

This hack mocks an exit success so that the test does not fail when
run on docker.

[juniorsysadmin]

For whatever reason $CHILD_STATUS.success does not evaluate to true when this test is run on TravisCI.

Puppet.debug("Warning: npm list --json exited with code #{$CHILD_STATUS.exitstatus}") unless $CHILD_STATUS.success?

This is a hack because there's no way to reproduce a way that npm will produce non-JSON output with npm list -g --json without a resulting exit failure - this is a unit test just for coverage that doesn't reflect normal output. Ideally, we probably would want to test the existence of both Puppet.debug statements being the output, but I couldn't think of a way to do this.

[igalic]

thanks @juniorsysadmin!