Merge Invoice tests#74

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asiaKaplanska wants to merge 7 commits intofracz:masterfrom

asiaKaplanska:InvoiceTests

Commits on Apr 22, 2020

Specs!
$fracz$ fracz
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Commits on Feb 5, 2022

New invoice tests
$fracz$ fracz
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Commits on Feb 26, 2022

Add test for null product check
$fracz$ fracz
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Commits on Feb 3, 2024

Commits on Feb 27, 2024

Add final version of invoice-exercise
asiaKaplanska
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