It is a bad fix for the existing tests. 

Existing tests specify static_view=True and base_url is an absolute path, therefore urls would be that url '/static/...' So the two options were to change or the result or the input. and now that I see it, I should have changed the input because you're testing exactly that, that there is an asset spec there.

The test would check for /static:
```python
     def test_assec_spec_globbing(self):
         from webassets import Bundle

         self.create_files({
             'static/__init__.py': '',
             'static/zing.css':
             '* { text-decoration: underline }',
             'static/zang.css':
             '* { text-decoration: underline }'})
         asset_spec = 'static:z*ng.css'
         bundle = Bundle(asset_spec)

         urls = bundle.urls(self.env)
         assert len(urls) == 2
         assert '/static/zing.css' in urls
         assert '/static/zang.css' in urls
```

Also I must confess that I had forgotten about this and reading the code again it might be a better way to do this.