Testing a Large GraphQL API With Aplomb
summary
Teachers Pay Teachers runs five Elixir web apps with a main GraphQL API serving about 3,000 requests per second and a test suite of 2,620 tests that run on each deploy; teams deploy ~25 times a day. The setup uses Absinthe, Phoenix test helpers, Bugsnag and Datadog metrics, DogStatsD, Credo and Dialyzer, Selenium for end-to-end checks, feature flags, circuit breakers, and custom helpers like test resolvers and a mock StatsD server to assert emitted metrics and JSON logs.
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chapters (6)
- 0:00Introduction and context
- 5:17Testing methodologies
- 13:33Advanced verification tools
- 19:25Instrumentation and error handling
- 32:47Testing for failure modes
- 43:58Conclusion and Q&A
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