assertEquals(Character.MIN_VALUE, echo.echoChar(Character.MIN_VALUE));
assertEquals(Character.MAX_VALUE, echo.echoChar(Character.MAX_VALUE));
assertEquals(Short.MIN_VALUE, echo.echoShort(Short.MIN_VALUE));
assertEquals(Short.MAX_VALUE, echo.echoShort(Short.MAX_VALUE));
assertEquals(Integer.MIN_VALUE, echo.echoInt(Integer.MIN_VALUE));
assertEquals(Integer.MAX_VALUE, echo.echoInt(Integer.MAX_VALUE));
assertEquals(Long.MIN_VALUE, echo.echoLong(Long.MIN_VALUE));