sometimes the packing back pressure test fails without reading all of the files.

[soldair]

  1) can pack
       applies backpressure when packing node_modules:

      Uncaught AssertionError [ERR_ASSERTION]: should have processed at least 1000 entries.
      + expected - actual

      -false
      +true
      
      at Transform.tar.pipe.on (test\packer.ts:21:26)
      at endReadableNT (_stream_readable.js:1129:12)
      at process._tickCallback (internal/process/next_tick.js:63:19)