JCLOUDS-619

Hello,

this is the fix for the issue described here[1].

Please review and let me know if you need something else.

Thanks and kind regards
Markus

[1] https://issues.apache.org/jira/browse/JCLOUDS-619
[minor] Here and below, static import `assertEquals`? Also, should be `assertEquals(partName, ...)` (i.e. "actual, expected").