Add tests for genesis functions

[ethanfrey]

#6 is a nice feature, but has no tests. We need some tests before tagging a release with this.

I didn't want to block merging it (and cause more conflicts), so I will merge it now, and just leave this issue open to finsih it.

For context, view the last two comments.

@sunnya97 it would be great if you could tackle this. If you don't want to, please say so here, so I ask others for help.

[workshub]

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