added assertion to check if an refresh token was provided
added assertion to check if an refresh token was provided

tkrille/osiam-connector4java-integration-tests,osiam/connector4java-integration-tests,tkrille/osiam-connector4java-integration-tests,osiam/connector4java-integration-tests,tkrille/osiam-connector4java-integration-tests,dacrome/connector4java-integration-tests,dacrome/connector4java-integration-tests