Test Command

Default ability to perform an "npm test" against the current project. Additionally, this command would be executed during an "upgrade", effectively verifying the tests against the current environment before assuming success.
1. Standalone "test" command, which executes "npm test" on current project.
2. Execution of "test" command prior to "upgrade"? Upgrade is invoked after a deploy, so perhaps it makes more sense for the deploy to be responsible for invoking "test"?

(Needs further definition before proceeding)