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));
assertEquals(Long.MAX_VALUE, echo.echoLong(Long.MAX_VALUE));
assertEquals(Float.MIN_VALUE, echo.echoFloat(Float.MIN_VALUE), 0.0f);
assertEquals(Float.MAX_VALUE, echo.echoFloat(Float.MAX_VALUE), 0.0f);
assertEquals(Double.MIN_VALUE, echo.echoDouble(Double.MIN_VALUE), 0.0);