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Hello,
I wish to introduce jest based unit tests for the project. I believe it's much faster than karma, easier to set up than karma,, it easily allows debug which can speed up development and of course it can serve as a great regression testing.
To run it run: npx jest (I didn't want to introduce new script in package.json before You would decide this is a way to go)
Additionaly I think this project may serve as a great sample for people who would like to start their adventure with unit testing SPFx.
Should You accept this PR I'll start writing more tests to increase the coverage.
Hope You will like it!