Tests are never a guarantee that your program is correct!
"Program testing can be used to show the presence of bugs, but never to show their absence!"
- Edsger W. Dijkstra
white box testing - unittest
black box testing
Snapshot testing
https://jestjs.io/docs/snapshot-testing
Snapshot Testing · Jest
Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly.
jestjs.io
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