resetting Mongoose model cache

I'm trying to get mocha's --watch option to work. It works fine, until I have to do anything with a mongoose model. Apparently Mongoose keeps some sort of cache, from my understanding, and the error I get has been tracked and closed. The problem is, I'm a bit new to this whole thing and need a little guidance how and where to put the things I need to get this to work. So, what I've tried:

• creating a wrapper around mongoose.model. Works, but obviously defeats the purpose of --watch.
• Disconnecting from Mongo (with mongoose.disconnect) in the "after" block of my Mongoose suite.
• Giving up on --watch and running tests fresh every time.

Of those three, obviously on the third works, and I'd really like to use all the features of my build tools. So, here's what I have. Where am I going wrong?

models/user.js

var mongoose = require('mongoose'),
    register = require('./_register');

var userSchema = mongoose.Schema({
    email: String,
    password: String
});

userSchema.methods.setPassword = function(password) {
    this.password = password;
};

module.exports = mongoose.model('User', userSchema);

test/models.user.js

var User = require('../models/user');

describe('User', function() {

    describe('#setPassword()', function() {
        it('should set the password', function() {
            var user = new User();
            user.setPassword('test');
            user.password.should.not.equal('');
        });
        it('should not be in plaintext');
    });

    describe('#verifyPassword()', function() {
        it('should return true for a valid password');
        it('should return false for an invalid password');
    });
});