EchoControllerTest.java

public class EchoControllerTest {

  private EchoController echoController;

  @Before
  public void init() {
    echoController = new EchoController();
  }

  @Test
  public void echo() throws Exception {
    String input = "input";
    String reverse = new StringBuilder(input).reverse().toString();
    assertEquals(reverse, echoController.echo(input).getEcho());
  }

}