[AI] Add tests for converter code

[rlazo]

Ensure we don't accidentally change how converters work and break them accidentally.

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add the 'no-changelog' label to the PR to silence this warning.)

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[davidmotson]

I'd recommend using mockk over mockito for kotlin code, specifically to avoid this weirdness