class SecurityUtils {

    public static boolean isAuthenticated() {
        SecurityContext securityContext = SecurityContextHolder.getContext();
        Collection<? extends GrantedAuthority> authorities = securityContext.getAuthentication().getAuthorities();
        if (authorities != null) {
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(AuthoritiesConstants.ANONYMOUS)) {
                    return false;
                }
            }
        }
        return true;
    }

}

class SecurityUtilsTest {

    @Test
    public void testAnonymousIsNotAuthenticated() {

        SecurityContext securityContext = SecurityContextHolder.createEmptyContext();
        Collection<GrantedAuthority> authorities = new ArrayList<>();
        authorities.add(new SimpleGrantedAuthority(AuthoritiesConstants.ANONYMOUS));
        securityContext.setAuthentication(new UsernamePasswordAuthenticationToken("anonymous", "anonymous", authorities));
        SecurityContextHolder.setContext(securityContext);
        boolean isAuthenticated = SecurityUtils.isAuthenticated();
        assertThat(isAuthenticated).isFalse();
    }

}