LGTM aside, I know that there's no baseline to make a mock test for this, but if you'd like to help, you could make a copy of this and edit it so that it reaches the codepath you've added https://github.com/jclouds/jclouds/blob/master/apis/s3/src/test/java/org/jclouds/s3/S3ClientMockTest.java
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