### Question:
Files { public static File tmpDir() { return new File(System.getProperty("java.io.tmpdir")); }  static void ensureDir(final String dir); static void ensureDir(final String dir, final boolean checkWrite); static void ensureDir(final File dir); static void ensureDir(final File dir, final boolean checkWrite); static String checkDir(final String dir); static String checkDir(final String dir, final boolean checkWrite); static String checkDir(final File dir); static String checkDir(final File dir, final boolean checkWrite); static String checkFile(final File file, final boolean checkWrite); static void ensureMv(final String src, final String dest); static void ensureMv(final String src, final String dest, final boolean overwrite); static void ensureMv(final File src, final File dest); static void ensureMv(final File src, final File dest, final boolean overwrite); static String mv(final String src, final String dest); static String mv(final String src, final String dest, final boolean overwrite); static String mv(final File src, final File dest); static String mv(final File src, final File dest, final boolean overwrite); static File tmpDir();  }### Answer:
@Test public void testTmpDir() throws Exception { File tmp = Files.tmpDir(); assertNotNull(tmp); }