@Test public void testSendMail() { assertEquals(MailUtil.sendMail(), "send email"); }
public static String sendMail() { return "send email"; }
MailUtil { public static String sendMail() { return "send email"; } }
MailUtil { public static String sendMail() { return "send email"; }  }
MailUtil { public static String sendMail() { return "send email"; }  static String sendMail(); }
MailUtil { public static String sendMail() { return "send email"; }  static String sendMail();  }