sequelize-test-helpers | A collection of utilities to help | Unit Testing library

The declaration of User inside function User in models.js should be const User = //definition. Otherwise, it creates a scoping issue which causes the function itself to be returned at the end. This makes the User model a singleton. When the require from another file (integration test) modifies what it think is its own version of the user model, it actually modifies the user model that the unittest.js file holds as well. This was a good lesson for myself to be extra careful when reusing variable names, or avoid them altogether.