Move test related content to lookup.test.js

[pseudopilot]

What does this change?

It fixes an inconsistency in the project structure by moving the test case from lookup.js to lookup.test.js, aligning with the established pattern of having tests in separate files.

Common Content?

• [ ] Block/s

Common Theme?

• [ ] Yes

Issue number: #378

Org Content?

Module

Checklist

• [ ] I have read the contributing guidelines
• [ ] I have checked my spelling and grammar with an automated tool
• [ ] I have previewed my changes to check the markdown renders as I intend
• [ ] I have run my code to check it works
• [ ] My changes follow our Style Guide

Who needs to know about this?

@CodeYourFuture/itp-syllabus-team

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