Build trustworthy test infrastructure: factory-based isolated test data, ephemeral per-run environments + service virtualization, automated flaky-test detection/quarantine, parallel sharding, and coverage+mutation reporting in CI.
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---
name: test-infrastructure
description: "Build trustworthy test infrastructure: factory-based isolated test data, ephemeral per-run environments + service virtualization, automated flaky-test detection/quarantine, parallel sharding, and coverage+mutation reporting in CI."
---
# Test Infrastructure
**Purpose:** keep the suite fast, isolated, trustworthy at scale.
## Test data
**Factories/builders**, per-test, disposable. Shared mutable fixtures are the #1 flake cause.
## Environments
Ephemeral per run (containerized deps, service virtualization for third parties); tear down after. Make **local == CI** by containerizing.
## Flake control
Track pass/fail history; auto-quarantine intermittent failures out of the required gate + assign an owner.
## Speed & quality
Parallelize/shard (isolation is the precondition). Report **coverage (floor) + mutation (truth)** in CI.
