AgentSkillsCN

Test Gap from Diff

给定一段代码差异，精准定位缺失的测试用例——借助测试需求矩阵，将改动的函数与所需的测试类型一一对应。

SKILL.md
--- frontmatter
name: Test Gap from Diff
description: Given a code diff, identify exactly which tests are missing — map changed functions to required test types using the test requirement matrix
category: testing
version: 1.0.0
triggers:
  - code-change-without-test
  - pr-created
  - coverage-drop
globs: "**/*.go"

Test Gap from Diff Skill

Analyze a code diff to identify exactly which tests need to be written, using the test requirement matrix (rule 123) to determine required test types.

Trigger Conditions

  • •Source code changes without corresponding test changes
  • •PR is created for review
  • •Coverage drops below threshold
  • •User invokes with "test gaps" or "test-gap-from-diff"

Input Contract

  • •Required: Git diff or list of changed files
  • •Optional: Current coverage report

Output Contract

  • •Per-function list of missing tests with required test type
  • •Priority ranking (critical path functions first)
  • •Test skeleton code for top-priority gaps
  • •Coverage delta estimate if tests are added

Tool Permissions

  • •Read: Source files, test files, coverage reports
  • •Write: None (analysis only; test-engineer writes the tests)
  • •Search: Grep for function signatures, test file patterns

Execution Steps

  1. •Parse diff: Extract list of changed functions/methods with file paths
  2. •Classify changes: Categorize each change per rule 123 matrix (model, service, handler, etc.)
  3. •Determine required tests: Map each change type to required test types (unit, integration, property, concurrency, fuzz)
  4. •Check existing coverage: For each changed function, check if required test types already exist
  5. •Identify gaps: List functions where required tests are missing
  6. •Prioritize: Rank gaps by: financial operations first, then public API, then internal logic
  7. •Report: Produce gap report with test type, priority, and estimated effort

Success Criteria

  • •All changed functions mapped to required test types
  • •All existing test coverage identified
  • •Clear gap report with actionable items

References

  • •.cursor/rules/123-test-requirement-matrix.mdc