Rule: Test-only change detection (test-only-change)

[ddjain]

Rule: Test-Only Change Detection

Overview

Identifies PRs that modify only test files without touching any source code.

Label Metadata

• Label Name: test-only-change
• Color: c5def5 (Light Blue)
• Description: Only test files modified in this PR

Detection Logic

• All modified files match test file patterns
• No source code files changed
• Can include test utilities, fixtures, mocks

File Patterns

Test files:

• **/test/**/*, **/__tests__/**/*
• **/*.test.js, **/*.spec.js
• **/*_test.rb, **/test_*.py
• **/*Test.java
• **/*.test.tsx
• **/fixtures/**
• **/mocks/**

Exclude as source:

• Any file matching test patterns above

Example Scenarios

Triggers:

• Modified: src/utils.test.js, tests/helpers.test.js
• Modified: __tests__/api.test.ts

Does NOT trigger:

• Modified: src/utils.test.js, src/utils.js
• Modified: README.md (only docs)

Test Cases Needed

• Detects when all files are test files
• Does NOT trigger when source files also changed
• Handles mixed test file types
• Handles test fixtures/mocks
• Ignores documentation/config in test-only PRs

Edge Cases

• Only test config changed (jest.config.js) - consider if test file
• Test utilities changed - should trigger
• Test data/fixtures changed - should trigger

Priority

Medium - Useful for test improvement tracking

---

Status: Not implemented
Category: Test Coverage & Quality