43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
---
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title: "Good Tests"
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date: 2023-05-12T23:40:19-04:00
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draft: false
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---
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_(Notes for a Viget article I'm putting together)_
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* Most importantly: **give you confidence to make changes**
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* Focus on two kinds of tests: unit and integration
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* Unit: test your objects/functions directly
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* Integration: simulated browser interactions
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* If you're building an API, you might also have request specs
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* But ideally you're testing the full integration of UI + API
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* Unit tests
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* Put complex logic into easily testable objects/functions
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* Avoid over-stubbing/mocking -- what are you even testing
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* Integration tests
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* You need proper end-to-end testing
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* Set up your data (fresh per test)
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* Visit a page
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* Interact with it
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* Make assertions about the results
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* Third-party/network calls
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* VCR is … OK but can become a maintenance problem
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* Block access to the web
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* Create stub objects to stand in for network calls
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* Use [JSON Schema][1] to ensure stub stays in sync
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* This will lead to more reliable tests and also more robust code
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* Coverage
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* We shoot for 100% in SimpleCov (So all the Ruby is tested)
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* Some consider this too high or too burdensome -- I don't
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* Occasionally you have to ignore some code -- e.g. something that only runs in production
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* Flaky tests are bad
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* They eat up a lot of development time (esp. as build times increase)
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* Try to stay on top of them and squash them as they arise
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* Some frameworks have `retry` options/libraries that can help (bandage not cure)
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* In general, though, flaky tests suck and generally indicate lack of quality with either your code or your tools
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[1]: https://json-schema.org/
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{{<thumbnail notes "400x" />}}
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