### Question:
FtpClient { public String getGreeting() { return "Hello My FTP Client."; } FtpClient(); static void main(String[] args); void open(); void close(); void listFiles(String path); void putFileToPath(File file, String path); void downloadFile(String source, String destination); String getGreeting();  }### Answer:
@Test public void testAppHasAGreeting() { FtpClient classUnderTest = new FtpClient(); assertNotNull("FtpClient should have a greeting", classUnderTest.getGreeting()); }