You have developed a model using TDD!

• The model layer represents entities and interactions in a web app’s problem domain.
• Model paths can be test-driven using validators. Call validateSync and make assertions on the properties of [instance].errors.[path].
• The storage of data can be tested with construction and updating methods like save and update. Retrieval can be tested with query methods like find, findOne, and findby.
• Static methods are stored in [schema].statics and instance methods are stored in [schema].methods. Both can be tested like any other JavaScript function.

To learn more about Mongoose, read the guide and refer to the API docs as needed.