Member bst::isApproxEqual (double a, double b, double epsilon): needs to be tested.
Member bst::isApproxEqualPercent (const double a, const double b, const double percent): needs to be tested.
Member bst::ITimer::setTimeout (int timeout_ms)=0: Change to size_t
Member ErrNum: change this namespace garbage
Member getTm (const bst::time::TimeZone time_zone, time_t time): remove
Member TEST (bst_filesystem, copyFile): Missing test coverage: Next append the source file with content so it's size is different from the destination file. Then perform the tests below and compare the file sizes.