@Test
    void checkGrouperNoGroups() {
        val strategy = new GrouperRegisteredServiceAccessStrategy() {
            @Serial
            private static final long serialVersionUID = 8533229193475808261L;

            @Override
            protected Collection<WsGetGroupsResult> fetchWsGetGroupsResults(final String principal) {
                return List.of();
            }
        };
        assertFalse(executeStrategy(strategy));
    }
The {@link GrouperRegisteredServiceAccessStrategyTests} provides
test cases for {@link GrouperRegisteredServiceAccessStrategy}.

@author Misagh Moayyed
@since 4.2
support/cas-server-support-grouper/src/test/java/org/apereo/cas/grouper/services/GrouperRegisteredServiceAccessStrategyTests.java