chore: Add some missing tests

[alimpens]

Describe the pull request

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What

This PR adds some missing tests.

Why

Tests allow us to more easily see if we introduce regressions or breaking changes.

How

I ran the tests with coverage, to see which lines weren't covered yet. Some slightly more complicated tests aren't covered yet.

Checklist

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• Add or update unit tests
• Add or update documentation
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• Add or update exports in index.* files
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Additional notes

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[VincentSmedinga]

Nice to see that coverage report 💯 :)