import() test plan

[domenic]

Ideal comprehensive test plan:

• normal evaluation
  • works
  • inherits nonce
  • inherits parser metadata
  • inherits credentials mode
  • all this in both module and classic scripts
• setTimeout
  • works
  • empty string nonce [More dynamic import() string compilation tests #7684, but see setTimeout() base URL/script fetch options behavior seems wrong whatwg/html#3116]
  • not-parser-inserted
  • omit credentials mode
  • all this in both module and classic scripts
• eval
  • works
  • inherits nonce
  • inherits parser metadata
  • inherits credentials mode
  • all this in both module and classic scripts
• event handler content attributes via event dispatch
  • works
  • inherits nonce from triggering script
  • inherits parser metadata from triggering script
  • inherits credentials mode from triggering script
  • all this in both module and classic scripts
• event handler content attributes via direct call (el.onclick())
  • works
  • inherits nonce from triggering script
  • inherits parser metadata from triggering script
  • inherits credentials mode from triggering script
  • all this in both module and classic scripts
• Error cases:
  • 404s/bad MIME type/etc. -> rejected with TypeError [Expand dynamic import() error case tests #7746]
  • instantiation error -> rejected with that error [Expand dynamic import() error case tests #7746]
  • evaluation error -> rejected with that error; evaluation error identity persists across calls [Expand dynamic import() error case tests #7746]
• Tricky cases: try to adapt existing test cases for errors, circular graphs, etc. by dynamically importing them

What else?

Tests so far: http://w3c-test.org/html/semantics/scripting-1/the-script-element/module/dynamic-import/

/cc @nyaxt @GeorgNeis @gsathya