public static boolean exists(String name) {
    name = getWellFormName(name);
    return STRING_ENV_MAP.containsKey(name);
  }
@Test
  public void testExistsForBlankName() {
    assertFalse(Env.exists(""));
    assertFalse(Env.exists("   "));
    assertFalse(Env.exists(null));
  }