specify posix.sys.statvfs:
- before:
    sv = require "posix.sys.statvfs"

- describe statvfs:
  - before:
      statvfs = sv.statvfs

  - context with bad arguments:
      if statvfs then
        badargs.diagnose (statvfs, "(string)")
      end

  - it returns a PosixStatvfs:
      if statvfs then
        expect (prototype (statvfs ("/"))).to_be "PosixStatvfs"
      end
  - it fetches statistics for a mounted file system:
      if statvfs then
        sv = statvfs "/"
        expect (type (sv)).to_be "table"
        for _, field in pairs {"f_bsize", "f_frsize", "f_blocks", "f_bfree",
              "f_bavail", "f_files", "f_ffree", "f_favail", "f_flag", "f_namemax"}
        do
          expect (type (sv[field])).to_be "number"
          expect (sv[field] >= 0).to_be (true)
        end
      end
  - it returns a non-negative value from fsid: |
      -- Merge this back into the previous example when #102 is fixed
      if statvfs then
        sv = statvfs "/"
        pending "issue #102"
        expect (sv[field] >= 0).to_be (true)
      end