### Question:
MailItem { public String getSender() { return sender; } MailItem();  MailItem(String title, String body, DataSource attachments, String sender, String... receivers);  MailItem(String title, String body, DataSource attachments, String sender, List<String> receivers);  MailItem(String title, String body, List<DataSource> attachments, String sender, String... receivers);  MailItem(String title, String body, List<DataSource> attachments, String sender, List<String> receivers); String getId(); void setId(String id); String getTitle(); void setTitle(String title); String getBody(); void setBody(String body); List<DataSource> getAttachments(); void setAttachments(List<DataSource> attachments); String getSender(); void setSender(String sender); List<String> getReceivers(); void setReceivers(String... receivers); void setReceivers(List<String> receivers); MailEvent getEvent(); void setEvent(MailEvent event); Map<String, String[]> getHeaders(); void setHeaders(Map<String, String[]> headers); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void getSender() throws Exception { item.setSender("sender"); assertEquals("sender", item.getSender()); }