fix #637: added test for fs.fsync()

[yatsenko-julia]

No description provided.

[codecov-io]

Codecov Report

Merging #638 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   86.62%   86.62%           
=======================================
  Files          16       16           
  Lines        1742     1742           
=======================================
  Hits         1509     1509           
  Misses        233      233

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[humphd]

The changes in fs.fsync.spec.js look good, but can you rebase to get rid of your extra changes in fs.ftruncate.spec.js, which I are from your other PR? I've merged that, so it should pick it up from master.