@Test
 public void testSupportedBlobStoreProviders() {
   Iterable<String> providers = BlobStoreUtils.getSupportedProviders();
   assert Iterables.contains(providers, "s3") : providers;
   assert Iterables.contains(providers, "azureblob") : providers;
   assert Iterables.contains(providers, "cloudfiles") : providers;
 }
 public static MutableBlobMetadata copy(MutableBlobMetadata in, String newKey) {
   MutableBlobMetadata newMd = BlobStoreUtils.copy(in);
   newMd.setName(newKey);
   return newMd;
 }