test_util_touch_file is racy and *does* fail
Tor's master has a broken test:
00:30:38 util/get_avail_disk_space: OK
00:30:38 util/touch_file:
00:30:38 FAIL ../src/test/test_util.c:4615: assert(st.st_mtime OP_GE now): 1452299437 vs 1452299438
00:30:38 [touch_file FAILED]
00:30:38 util/pwdb: [forking] OKfrom test_util.c:
const time_t now = time(NULL);
struct stat st;
write_bytes_to_file(fname, "abc", 3, 1);
tt_int_op(0, OP_EQ, stat(fname, &st));
tt_i64_op(st.st_mtime, OP_GE, now);The test is flawed to begin with, there's no guarantee for how much or little time is between the time() call and the write().
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