public void testMetadataStatic() {
   CreateContainerOptions options =
       CreateContainerOptions.Builder.withMetadata(ImmutableMultimap.of("test", "foo"));
   assertEquals(
       ImmutableList.of("foo"),
       options.buildRequestHeaders().get(AzureStorageHeaders.USER_METADATA_PREFIX + "test"));
 }
 public void testPublicAclStatic() {
   CreateContainerOptions options = CreateContainerOptions.Builder.withPublicAcl();
   assertEquals(
       ImmutableList.of("true"), options.buildRequestHeaders().get("x-ms-prop-publicaccess"));
 }