Add a test case for new method.
Add a test case for new method.

mistio/libcloud,ByteInternet/libcloud,andrewsomething/libcloud,Kami/libcloud,andrewsomething/libcloud,Kami/libcloud,Kami/libcloud,apache/libcloud,andrewsomething/libcloud,ByteInternet/libcloud,mistio/libcloud,ByteInternet/libcloud,mistio/libcloud,apache/libcloud,apache/libcloud