### Question:
HadoopClientFactory { public static HadoopClientFactory get() { return INSTANCE; } private  HadoopClientFactory(); static HadoopClientFactory get(); FileSystem createFalconFileSystem(final URI uri); FileSystem createFalconFileSystem(final Configuration conf); FileSystem createProxiedFileSystem(final Configuration conf); DistributedFileSystem createDistributedProxiedFileSystem(final Configuration conf); FileSystem createProxiedFileSystem(final URI uri); FileSystem createProxiedFileSystem(final URI uri,
                                              final Configuration conf); @SuppressWarnings("ResultOfMethodCallIgnored") FileSystem createFileSystem(UserGroupInformation ugi, final URI uri,
                                       final Configuration conf); @SuppressWarnings("ResultOfMethodCallIgnored") DistributedFileSystem createDistributedFileSystem(UserGroupInformation ugi, final URI uri,
                                                             final Configuration conf); void validateJobClient(String executeUrl, String rmPrincipal); static FsPermission getDirDefaultPermission(Configuration conf); static FsPermission getFileDefaultPermission(Configuration conf); static FsPermission getDirDefault(); static FsPermission getFileDefault(); static void mkdirsWithDefaultPerms(FileSystem fs, Path path); static void mkdirs(FileSystem fs, Path path,
                              FsPermission permission); static final String FS_DEFAULT_NAME_KEY; static final String MR_JT_ADDRESS_KEY; static final String YARN_RM_ADDRESS_KEY; static final FsPermission READ_EXECUTE_PERMISSION; static final FsPermission ALL_PERMISSION; static final FsPermission READ_ONLY_PERMISSION; }### Answer:
@Test public void testGet() throws Exception { HadoopClientFactory clientFactory = HadoopClientFactory.get(); Assert.assertNotNull(clientFactory); }