@Test
    void verifyRequireNotMultiValuedAllowsSingleValued() {
        val parametersToCheck = new HashSet<String>();
        parametersToCheck.add("dogName");

        val parameterMap = new HashMap<String, String[]>();
        parameterMap.put("dogName", new String[]{"Abbie"});
        RequestParameterPolicyEnforcementFilter.requireNotMultiValued(parametersToCheck, parameterMap);
    }
Tests the {@link RequestParameterPolicyEnforcementFilter}.
<p>
First there are test cases for the Filter as a whole against the Filter API.  The advantage of these is that they
are testing at the level we care about, the way the filter will actually be used,
against the API it really exposes to adopters.  So, great.  The disadvantage of these is that it's
<p>
Then there are test cases for bits of the implementation of the filter (namely, configuration parsing and policy
enforcement).

@author Andrew Petro
@author Misagh Moayyed
@since 6.1
core/cas-server-core-web-api/src/test/java/org/apereo/cas/web/support/filters/RequestParameterPolicyEnforcementFilterTests.java