Robust Tests for Unconventional Environments
summary
Dapper wallet is an Ethereum Chrome extension that deploys a smart contract per user, so transactions are slow (about 15–20 tx/s, ~1–2 minutes to confirm) and cost money (roughly $0.25 each); tests replicate production by running a geth local blockchain plus the API to catch issues missed by simple mocks. Integration tests cover popup/background/context-script messaging, login flows split into discrete steps, and Cypress is used by building the extension, serving it over HTTP, and mocking the Chrome API — which speeds development but sometimes hides encoding bugs.
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chapters (9)
- 0:00Introduction and background
- 1:30What is Dapper Labs
- 3:35Smart contracts and Chrome extensions
- 7:12Early development challenges
- 10:30Challenge one: Blockchain transactions
- 14:41Challenge two: Extension UX flows
- 18:53Challenge three: Message handling
- 23:51Testing unconventional environments
- 26:43Key takeaways and conclusion
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