@Test
public void testSymlinkWithNullInput() throws IOException {

  File file = new File(del, FILE);
  File link = new File(del, "_link");
  // Create the same symbolic link
  // The operation should fail and returns 1
  int result = FileUtil.symLink(null, null);
  Assert.assertEquals(1, result);
  // Create the same symbolic link
  // The operation should fail and returns 1
  result = FileUtil.symLink(file.getAbsolutePath(), null);
  Assert.assertEquals(1, result);
  // Create the same symbolic link
  // The operation should fail and returns 1
  result = FileUtil.symLink(null, link.getAbsolutePath());
  Assert.assertEquals(1, result);
}