@Test
public void testInvalidSignature() {

    final MockHttpServletRequest request = new MockHttpServletRequest();
    request.addHeader("X-Line-Signature", "SSSSIGNATURE");
    request.setContent("{}".getBytes(StandardCharsets.UTF_8));
    assertThatThrownBy(() -> lineBotCallbackRequestParser.handle(request))
            .isInstanceOf(LineBotCallbackException.class)
            .hasMessage("Invalid API signature");
}