Test "Antora support with single documentation component" is flaky

[ViToni]

trafficstars

Hit the issue only once locally and once in a pipeline but still unexpected:

• What you're trying to do: Executing npm run test on master
• What happened: Test is flaky:

  1) Antora support with single documentation component
       Should build content catalog:
     TypeError: Cannot read properties of undefined (reading 'getImages')
  	at /Users/vtoni/git/asciidoctor-vscode/dist/src/test/antoraSupport.test.js:219:35
  	at Generator.next (<anonymous>)
  	at fulfilled (dist/src/test/antoraSupport.test.js:28:58)

Re-executing npm run test doesn't hit the failing test

• What you expected to happen: Test should be stable

I've seen the test also fail in a Windows pipeline (not master, feature branch with unrelated changes):

• https://github.com/asciidoctor/asciidoctor-vscode/actions/runs/8307511948/job/22736788637#step:8:237

System Info Commit: acbb89000276bc1541b2c66385009f59645b3d60 Date: 2024-03-17T19:45+01:00 Node.js: 18.14.2 OS: MacOS Sonoma 14.4