Feature-16-sidebar-test

[florentin]

Tests with Jest framework

Fix #0

[aem-code-sync]

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• Re-run PSI Checks

[andreituicu]

The boilerplate already had unit testing setup and was removed in adobe/aem-boilerplate#211 .
If we wanted to have unit tests, I think the best would be to bring back the same setup, rather than add new frameworks.
Example usage in the block collection from where the fragment block was taken: https://github.com/adobe/helix-block-collection/tree/main/test