What is the best way to mock xero-node in unit tests?

[createthis]

When working with other vendor APIs, there are usually mock packages available to make writing unit tests considerably easier.

Examples:

• axios
  • axios-mock-adapter
• aws-sdk
  • aws-sdk-mock

I don't see an equivalent for xero-node.

What is the best way to mock xero-node in unit tests, currently?