@Test
    void verifyOperation() throws Throwable {
        val service = addRegisteredService();
        val auth = service.getClientId() + ':' + CLIENT_SECRET;
        val body = (OAuth20IntrospectionAccessTokenResponse) internalVerifyOperation(auth, service);

        assertNotNull(body);
        assertEquals(service.getClientId(), body.getClientId());
        assertEquals(SERVICE_URL, body.getAud());
    }
This is {@link OAuth20IntrospectionEndpointControllerTests}.

@author Misagh Moayyed
@since 6.1.0
support/cas-server-support-oauth/src/test/java/org/apereo/cas/support/oauth/web/endpoints/OAuth20IntrospectionEndpointControllerTests.java