“SIGINT - custom in parent and child” is flaky on Linux (possibly need slow CPU to reproduce)

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Environment details

• OS: Linux (various Fedora and openSUSE)
• node-pty version: 1.1.0-beta21 (as shipped in vscode)
• node.js version: Electron 30.x with ELECTRON_RUN_AS_NODE

Issue description

  18 passing (13s)
  1 failing

  1) UnixTerminal
       signals in parent and child
         SIGINT - custom in parent and child:

      Uncaught AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:

false !== true

      + expected - actual

      -false
      +true
      
      at ChildProcess.<anonymous> (lib/unixTerminal.test.js:171:28)
      at ChildProcess.emit (node:events:519:28)
      at maybeClose (node:internal/child_process:1105:16)
      at ChildProcess._handle.onexit (node:internal/child_process:305:5)

We've observed this test occasionally failing on aarch64, arm and riscv64, but never on x86_64. (This is possibly due to our x86_64 machines being fast)