auto-test-guard

Behavior-focused assertions validate user-visible contracts and outcomes rather than internal implementation steps. They enforce high-signal test design by ensuring each test protects a specific behavior contract, reducing maintenance cost and preventing low-value coverage.

The best way to add regression tests is by writing minimal cases that directly protect the previously broken behavior. High-signal regression coverage ensures the test specifically guards the fixed contract without introducing redundant or low-value cases.

Isolate nondeterministic dependencies like random, time, network, filesystem, database, and LLM using isolation markers or clear scope boundaries. Stability-aware isolation prevents unstable dependencies from causing test quality drift and hiding real regressions.

Excessive mocking increases test maintenance cost because it couples tests to internal implementation rather than behavior contracts. Discouraging low-signal coverage and redundant mocks keeps suites focused on meaningful assertions that catch real regressions.

Yes, the test quality guardrail applies directly to TDD iterations and refactoring workflows. It enforces constraints on assertion meaning, fixture usage, and dependency isolation to prevent test quality drift during unit, integration, and regression test development.

Avoid snapshot testing when it produces low-signal coverage that hides real regressions. The guardrail discourages excessive snapshots and redundant cases, requiring meaningful behavior-contract-focused assertions that validate specific outcomes instead of brittle implementation snapshots.