Multiplatform

```python
from contesto.basis.test_case import UnittestContestoTestCase as ContestoTestCase

# providing driver mixins, to create platform specific tests:
class QtWebkitTestCase(ContestoTestCase, QtWebkitDriver):
  pass

class HttpTestCase(ContestoTestCase, HttpDriver):
  pass

# for backward compatibility if no driver provided - HttpDriver will be mixed in
class DefaultHttpTestCase(ContestoTestCase):
  pass
```