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6c19d872a0
Previously all the threads were writing the received tokens to a HashSet. In cases with many threads, sometimes (1 every ~25 tests) calling size() on the HashSet returned 2 even though it seemed to contain only one String and there was no evidence from logging that threadSecurityClient.refreshToken() ever returned a different access or refresh token. This commit changes the test to use a ConcurrentHashMap instead, checking that we only received one pair of access token/refresh token eventually. It also adds a check so that we won't take into consideration tokens that are returned after 30s, hence not in the concurrent refresh time window.