@Test
    void verifyOperationFromOtherClient() throws Throwable {
        val registeredService2 = getRegisteredService(REDIRECT_URI, CLIENT_ID2, CLIENT_SECRET);
        servicesManager.save(registeredService2);
        val registeredService = addRegisteredService();

        val auth2 = CLIENT_ID2 + ':' + CLIENT_SECRET;
        val body = (OAuth20IntrospectionAccessTokenResponse) internalVerifyOperation(auth2, registeredService);
        assertNotNull(body);
        assertEquals(registeredService.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