Building an Immune System in Scala

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" summary

Outbrain’s Immune system uses Scala, ScalaTest and Specs2 plus JDBC to isolate tests by creating and deleting test data per test, applying a test-data loan pattern, and mixing in a Specs2 ForEach scope trait so each test gets a fresh DB transaction. This removes shared-state flakiness, enables parallel runs, cuts a service’s integration-suite runtime from about 25 minutes down to ~4 minutes, and eliminates per-test boilerplate while keeping CI-driven delivery fast and reliable.

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" chapters (6)

1. 0:00Introduction
2. 1:25Testing challenges at scale
3. 6:10Pain points in testing
4. 10:59Solving flakiness and slowness
5. 17:09Loan pattern for isolation
6. 21:52Results and improvements

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