test: test/parallel/test-fs-write-sync.js failed when node < 7.2.0

[JacksonTian]

• Version: < 7.1.0
• Platform: Darwin jacksontian-air 16.6.0 Darwin Kernel Version 16.6.0: Fri Apr 14 16:21:16 PDT 2017; root:xnu-3789.60.24~6/RELEASE_X86_64 x86_64
• Subsystem: fs

# the v7.2.0 is OK.
$ ~/.tnvm/versions/node/v7.2.0/bin/node ~/git/nodejs/test/parallel/test-fs-write-sync.js 
# the versions before v7.2.0 is NOT OK.
$ ~/.tnvm/versions/node/v6.11.0/bin/node ~/git/nodejs/test/parallel/test-fs-write-sync.js 

assert.js:81
  throw new assert.AssertionError({
  ^
AssertionError: false == true
    at Object.<anonymous> (/Users/jacksontian/git/nodejs/test/parallel/test-fs-write-sync.js:57:10)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:504:3

I try to find out which commit fix it in v7.2.0, but failed.

The fixes should be back port to 4.x & 6.x.

[vsemozhetbyt]

@JacksonTian #7856?

[vsemozhetbyt]

It seems this is the backport for v6.x: #13179

[maclover7]

Since the fix landed, going to close out this issue. If the tests starts to become flaky again, or if this needs to stay open, please reopen the issue :)