@Test(expected = NullPointerException.class)
public void test_search_cerberus_metadata_parameter_null() throws IOException {

    String sdbName = "test sdb";
    String principalName = "arn:aws:iam::111111111111:role/example/role";
    ArrayList<String> results = cerberusMetadataLookup.searchCerberusMetadata(null, sdbName, principalName);
    assertNotNull(results);
}