Consider structuring these tests differently:

```js
describe('Given a model that expires five minutes from now', function() {
  describe('Calling expire now', function() {
    it('expires the model', function() {
    });
  });

  describe('Calling refresh', function() {
    it('expires the model', function() {
    });

    it('fetches the model', function() {
    });
  });
});
```