@Test (timeout = 30000)
public void testEscapeString() throws Exception {

  assertEquals(NULL_STR, StringUtils.escapeString(NULL_STR));
  assertEquals(EMPTY_STR, StringUtils.escapeString(EMPTY_STR));
  assertEquals(STR_WO_SPECIAL_CHARS,
      StringUtils.escapeString(STR_WO_SPECIAL_CHARS));
  assertEquals(ESCAPED_STR_WITH_COMMA,
      StringUtils.escapeString(STR_WITH_COMMA));
  assertEquals(ESCAPED_STR_WITH_ESCAPE,
      StringUtils.escapeString(STR_WITH_ESCAPE));
  assertEquals(ESCAPED_STR_WITH_BOTH2, 
      StringUtils.escapeString(STR_WITH_BOTH2));
}