Need testing for edge cases and idiosyncrasies

[pederhan]

The following situations need to have tests implemented for them:

• No auth credentials should prompt: Launching the application with no Harbor auth credentials then running a command which requires credentials should prompt for credentials, then run the command with the given credentials. Test should ensure that a prompt is shown, the arguments are parsed successfully, and that the Harbor client is updated with said credentials. Finally, ensure the client uses the new credentials when running the command.
  • Implemented by Fix user input (prompts) tests #69
• Global options overrides are reset between commands in REPL: When in the REPL, using a global option such as --json should only last for the duration of that command and should reset back to the original setting after the command has finished executing.

This list should be expanded with all such examples.