### Question:
EmailMessage { public void setSubject(String subject) { this.subject = subject; } EmailMessage();  EmailMessage(String from, String to, List<String> cc, String subject, String content);  EmailMessage(String from, String to, List<String> cc, List<String> bcc, String subject, String content); String getFrom(); void setFrom(String from); String getTo(); void setTo(String to); List<String> getCc(); void setCc(List<String> cc); String getSubject(); void setSubject(String subject); String getContent(); void setContent(String content); List<String> getBcc(); String getBccToString(); String getCcToString(); void setBcc(List<String> bcc); void send(); InternetAddress[] getReplyTo(); void addReplyTo(InternetAddress... internetAddresses);  }### Answer:
@Test public void testSetSubject() { String subject = ""; EmailMessage instance = new EmailMessage(); instance.setSubject(subject); }