@Test
public void testGetAllExtensionsFilteredWithNoResult() {

    final Set<String> bucketIds = new HashSet<>();
    bucketIds.add("1");
    bucketIds.add("2");
    bucketIds.add("3");
    final ExtensionFilterParams filterParams = new ExtensionFilterParams.Builder()
            .tag("DOES NOT EXIST")
            .build();
    final List<ExtensionEntity> extensions = metadataService.getExtensions(bucketIds, filterParams);
    assertNotNull(extensions);
    assertEquals(0, extensions.size());
}