@Test
    public void shouldPassthroughOnNullTokenIfOAuthNotRequired() {
        config.setRequireOauth(false);
        keycloakOauthPolicy.apply(apiRequest, mContext, config, mChain);
        verify(mChain).doApply(any(ApiRequest.class));
    }
Test the {@link KeycloakOauthPolicy}.

With thanks to the Keycloak project for their RSAVerifierTest whose setup procedures are adapted here for
our requirements.

@author Marc Savy {@literal <msavy@redhat.com>}
plugins/keycloak-oauth-policy/src/test/java/io/apiman/plugins/keycloak_oauth_policy/KeycloakOauthPolicyTest.java