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testability-obstacle

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MUST USE for C#/.NET deterministic tests that require the smallest production seam for DateTime/Task.Delay/File/Environment/Guid/Random, static API preservation, nested/parallel overrides, or no real I/O. USE ONLY when the target workspace contains C# source plus a .csproj or .sln. DO NOT USE for audits, bulk migration, code that already has an injectable seam, or an explicit migration to a user-named existing abstraction (migrate-static-to-wrapper). Use instead of general test generation when the requested test is impossible without a production edit and seam selection is still open.

plugins/dotnet-test/skills/testability-obstacle/SKILL.md

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# Resolve a Testability Obstacle

Introduce the smallest behavior-preserving seam needed to test a specific C#
behavior, then add deterministic tests that prove both the behavior and the seam.
The production edit is a means to the requested test, not an invitation to
redesign adjacent code.

## When to Use

- A requested test would otherwise read/write the real filesystem.
- Behavior depends on the current time, delay, random value, environment, console,
  process, or another ambient dependency.
- The user explicitly permits or requests a safe production seam.
- Existing tests cannot control a dependency without process-global mutation.