### Question:
KerberosServerAction extends AbstractServerAction { @SuppressWarnings("unchecked") protected static Map<String, String> getPrincipalPasswordMap(Map<String, Object> requestSharedDataContext) { if (requestSharedDataContext == null) { return null; } Object map = requestSharedDataContext.computeIfAbsent(PRINCIPAL_PASSWORD_MAP, k -> new HashMap<String, String>()); return (Map<String, String>) map; }   static final String AUTHENTICATED_USER_NAME; static final String DATA_DIRECTORY; static final String DEFAULT_REALM; static final String SERVICE_COMPONENT_FILTER; static final String HOST_FILTER; static final String IDENTITY_FILTER; static final String KDC_TYPE; static final String UPDATE_CONFIGURATION_POLICY; static final String UPDATE_CONFIGURATION_NOTE; static final String DATA_DIRECTORY_PREFIX; static final String KEYTAB_CONTENT_BASE64; static final String OPERATION_TYPE; static final String INCLUDE_AMBARI_IDENTITY; static final String PRECONFIGURE_SERVICES; }### Answer:
@Test public void testGetPrincipalPasswordMapStatic() throws Exception { ConcurrentMap<String, Object> sharedMap = new ConcurrentHashMap<>(); Assert.assertNotNull(KerberosServerAction.getPrincipalPasswordMap(sharedMap)); }