Virtual file copying failing on Windows and Mac

[chung-leong]

  Integration tests (node-zigar, Debug)
    Stream handling
      1) should copy real file to virtual file
      ✔ should copy virtual file to virtual file (17512ms)
      2) should copy virtual file to real file


  1 passing (53s)
  2 failing

  1) Integration tests (node-zigar, Debug)
       Stream handling
         should copy real file to virtual file:
     Error: Read failed
      at copy (<anonymous>:1336:26)
      at Context.<anonymous> (file:///C:/Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2589:22)

  2) Integration tests (node-zigar, Debug)
       Stream handling
         should copy virtual file to real file:
     Error: Write failed
      at copy (<anonymous>:1336:26)
      at Context.<anonymous> (file:///C:/Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2611:26)

[chung-leong]

  Integration tests (node-zigar, ReleaseSmall)
    Stream handling
InvalidFileDescriptor [Error]: Invalid file descriptor
    at Tn (<anonymous>:1058:32)
    at <anonymous>:5459:21
    at Bn (<anonymous>:1047:23)
    at r.fdSendfile (<anonymous>:5455:20)
    at r.<anonymous> (<anonymous>:1888:33)
    at r.invokeThunk (<anonymous>:1388:74)
    at copy (<anonymous>:1336:26)
    at Context.<anonymous> (file:///Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2589:22) {
  errno: 8
}
      1) should copy real file to virtual file
InvalidFileDescriptor [Error]: Invalid file descriptor
    at Tn (<anonymous>:1058:32)
    at <anonymous>:5459:21
    at Bn (<anonymous>:1047:23)
    at r.fdSendfile (<anonymous>:5455:20)
    at r.<anonymous> (<anonymous>:1888:33)
    at r.invokeThunk (<anonymous>:1388:74)
    at copy (<anonymous>:1336:26)
    at Context.<anonymous> (file:///Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2598:22) {
  errno: 8
}
      ✔ should copy virtual file to virtual file (11382ms)
InvalidFileDescriptor [Error]: Invalid file descriptor
    at Tn (<anonymous>:1058:32)
    at <anonymous>:5463:21
    at Bn (<anonymous>:1047:23)
    at r.fdSendfile (<anonymous>:5455:20)
    at r.<anonymous> (<anonymous>:1888:33)
    at r.invokeThunk (<anonymous>:1388:74)
    at copy (<anonymous>:1336:26)
    at Context.<anonymous> (file:///Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2611:26) {
  errno: 8
}
      2) should copy virtual file to real file
      ✔ should copy real file to virtual file using sendfile (11331ms)
      ✔ should copy virtual file to virtual file using sendfile (11424ms)
      ✔ should copy virtual file to real file using sendfile (11729ms)


  4 passing (1m)
  2 failing

  1) Integration tests (node-zigar, ReleaseSmall)
       Stream handling
         should copy real file to virtual file:

      AssertionError: expected [ …(3) ] to have a length of 1 but got 3
      + expected - actual

      -3
      +1
      
      at Context.<anonymous> (file:///Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2591:29)

  2) Integration tests (node-zigar, ReleaseSmall)
       Stream handling
         should copy virtual file to real file:
     ReferenceError: string is not defined
      at Context.<anonymous> (file:///Users/cleong/zigar/zigar-compiler/test/integration/stream-handling/tests.js:2617:34)