@Test
    void verifyOperation() {
        val attributes = PrincipalAttributeRepositoryFetcher.builder()
            .attributeRepository(aggregatingAttributeRepository)
            .principalId("casuser")
            .currentPrincipal(CoreAuthenticationTestUtils.getPrincipal("current-cas"))
            .build()
            .fromAllAttributeRepositories()
            .retrieve();
        assertNotNull(attributes);
    }
This is {@link PrincipalAttributeRepositoryFetcherCascadeTests}.

@author Misagh Moayyed
@since 6.2.0
support/cas-server-support-person-directory/src/test/java/org/apereo/cas/PrincipalAttributeRepositoryFetcherCascadeTests.java