@Test
  public void testVerifyPathnameExists() throws FileNotFoundException {
    assertThat(System.getProperty("java.io.tmpdir"))
        .isEqualTo(IOUtils.verifyPathnameExists(System.getProperty("java.io.tmpdir")));
  }
Gets a fully-qualified path anchored at root.
<p>

@param pathElements a String array containing the elements of the path.
@return a fully-qualified pathname as a String value.
geode-core/src/test/java/org/apache/geode/internal/util/IOUtilsJUnitTest.java