Add test cases for ESM initialization problems

[thewilkybarkid]

↪️ Pull Request

I've extracted the test case from #7293 (comment); that PR should have caused it to break.

💻 Examples

🚨 Test instructions

✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

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[thewilkybarkid]

An aside, but with optimisation enabled the module is empty. It probably should fail?