Thanks Wysota
The problem is running the app in debugging from Visual Studio:

This is the result running your test without debugging

********* Start testing of HashListBenchmark *********
Config: Using QTest library 4.6.3, Qt 4.6.3
PASS : HashListBenchmark::initTestCase()
RESULT : HashListBenchmark::clearHash():
1,343 msec per iteration (total: 1343, iterations: 1)
PASS : HashListBenchmark::clearHash()
PASS : HashListBenchmark::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped
********* Finished testing of HashListBenchmark *********
with debugging is still running after 30 minutes...