tapError: incorrect number of tests: "not ok test count !== plan"

[alban]

Some tests fail with "tapError: incorrect number of tests":

validation/linux_readonly_paths.t .........................validation/linux_readonly_paths.t ..validation/linux_readonly_paths.t ................... 20/27
  not ok test count !== plan
    +++ found
    --- wanted
    -20
    +26
    results:
      ok: false
      count: 26
      pass: 26
      fail: 1
      bailout: false
      todo: 0
      skip: 6
      plan:
        start: 1
        end: 20
        skipAll: false
        skipReason: ''
        comment: ''
      failures:
        - tapError: incorrect number of tests

  Skipped: 6
     syscall action SCMP_ACT_ALLOW
     syscall action SCMP_ACT_ALLOW
     syscall action SCMP_ACT_ALLOW
     syscall action SCMP_ACT_ALLOW
     syscall action SCMP_ACT_ALLOW
     syscall action SCMP_ACT_ALLOW

Other tests failing similarly:

• validation/linux_readonly_paths.t
• validation/hostname.t
• validation/default.t
• validation/process_rlimits.t
• validation/linux_masked_paths.t
  etc.

Tested with:

$ /home/alban/.nvm/versions/node/v9.7.1/bin/tap --version
11.1.1
$ sudo TAP="/home/alban/.nvm/versions/node/v9.7.1/bin/tap --color" make localvalidation