protected static OAuth20RefreshToken getRefreshToken() {
        return OAuth20TestUtils.getRefreshToken(RegisteredServiceTestUtils.CONST_TEST_URL, UUID.randomUUID().toString());
    }
This is {@link AbstractOAuth20Tests}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-oauth/src/test/java/org/apereo/cas/AbstractOAuth20Tests.java