Testing Mock Discipline

Overview

Use this skill to evaluate test quality, reduce brittle over-mocking, and move teams toward high-confidence tests through dependency injection, realistic fakes, and integration coverage.

Workflow

1. Map the System Under Test

Identify what behavior must be trusted in production, then list dependencies by type:

• Pure logic: deterministic transforms/calculations.
• Internal collaborators: domain services/repositories/adapters.
• IO boundaries: filesystem, DB, network, queues, clock, randomness.

State which dependencies are currently global singletons or imported directly.