protected String concat( String basePath,  String relativePath ) {
    return FilenameUtils.concat( basePath, relativePath );
  }
@Test
  public void testConcat() {
    String basePath = "/tmp/some/path";
    String relativePath = "that/is/temporary";
    String expectedPath = applyFileSeperator( "/tmp/some/path/that/is/temporary" );

    // CASE 1: Add separator
    assertEquals( expectedPath, servlet.concat( basePath, relativePath ) );

    // CASE 2: Don't add separator
    assertEquals( expectedPath, servlet.concat( basePath + "/", relativePath) );
  }