public void testWriteStableHow() throws IOException, InterruptedException {
NfsConfiguration config = new NfsConfiguration();
DFSClient client = null;
MiniDFSCluster cluster = null;
RpcProgramNfs3 nfsd;
SecurityHandler securityHandler = Mockito.mock(SecurityHandler.class);
Mockito.when(securityHandler.getUser()).thenReturn(
System.getProperty("user.name"));
String currentUser = System.getProperty("user.name");
config.set(
DefaultImpersonationProvider.getProxySuperuserGroupConfKey(currentUser),
"*");