Some unit tests failing on macOS

[willeastcott]

7 unit tests fail on macOS. This seems related to problems loading PNGs in JSDOM on macOS. This problem does not occur on Windows or Linux.

Mocha output:

  1359 passing (44s)
  2 pending
  8 failing

  1) AssetReference
       should call load callback when asset is loaded:
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/asset/asset-reference.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  2) AssetRegistry
       #loadFromUrl
         loads texture assets:
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/asset/asset-registry.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  3) ImageElement
       "before each" hook for "Add Image Element":
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/components/element/image-element.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  4) TextElement
       "before each" hook for "does not break onto multiple lines if the text is short enough":
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/components/element/text-element.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  5) ParticleSystemComponent
       "before each" hook for "Add particlesystem":
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/components/particlesystem/component.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  6) SpriteComponent
       "before each" hook for "Add new Component":
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/components/sprite/component.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  7) SpriteHandler
       loads from filesystem:
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/handlers/sprite-handler.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)

  8) SpriteHandler
       loads from asset data:
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/willeastcott/Dev/engine/test/framework/handlers/sprite-handler.test.mjs)
      at listOnTimeout (node:internal/timers:573:17)
      at process.processTimers (node:internal/timers:514:7)