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. test70: regression test for m_out vfs race condition The following tests use testcache.c to generate test i/o patterns, generate random write data and verify the reads. . test71: blackbox full-stack test of FS operation, testing using the regular VFS interface crazy i/o patterns with various working set sizes, triggering only primary cache, also secondary cache, and finally disk i/o and verifying contents all the time . test72: unit test of libminixfs, implementing functions it needs from -lsys and -lblockdriver and the client in order to simulate a working cache client and backend environment. . test73: blackbox test of secondary vm cache in isolation Change-Id: I1287e9753182b8719e634917ad158e3c1e079ceb