public void SendMail_with_invalid_body_failed(string body)
{
//arrange
//act
var fakeRes = _service.SendMail(body, "Normal", "*****@*****.**");
var asyncFakeRes = _service.SendMailAsync(body, "Normal", "*****@*****.**").Result;
//assert
Assert.True(fakeRes.HasError);
Assert.True(asyncFakeRes.HasError);
}