Add working test setup for unit and integration tests #34

Job	Run time
Web tests (browser matrix) (firefox)	1m 14s
Web tests (browser matrix) (chromium)	2m 24s
Desktop (Electron) tests (macos-latest, macOS)	1m 2s
Desktop (Electron) tests (windows-latest, Windows)	1m 25s
Web tests (browser matrix) (webkit)	8m 5s
Desktop (Electron) tests (ubuntu-latest, Linux)	51s
	15m 1s

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