Improve Coverage Command

Analyze test coverage and add new test cases to improve coverage without changing implementation.

This command uses the Test Coverage Improvement Expert skill for analysis and test generation.

Usage

/improve-coverage

What It Does

The improve-coverage skill automatically:

Runs coverage analysis - Uses appropriate tool for project type
Identifies gaps - Functions, branches, and lines not covered
Prioritizes - Critical paths and security functions first
Writes tests - Following existing patterns
Verifies improvement - Confirms coverage increase

Critical Rules

DO	DON'T
Add new test cases	Modify implementation code
Follow existing patterns	Refactor existing tests
Use descriptive names	Change production behavior
Ensure all tests pass	Skip verification

Coverage Goals

Area	Target
Critical paths	100%
Business logic	90%+
Utilities	80%+
UI components	70%+

Project Support

Project	Coverage Command
Foundry	`forge coverage --report summary`
Jest	`jest --coverage`
Vitest	`vitest --coverage`

Test Case Categories

Success cases: Normal operation with valid inputs
Error cases: Invalid inputs, unauthorized access
Edge cases: Zero values, max values, boundaries
State transitions: Multi-step processes

Example Tests

Foundry/Solidity

function test_RevertWhen_Unauthorized() public {
    vm.prank(unauthorizedUser);
    vm.expectRevert(MyContract.Unauthorized.selector);
    myContract.protectedFunction();
}

Jest/TypeScript

it('should return 401 when unauthorized', async () => {
    const res = await request(app).get('/api/users');
    expect(res.status).toBe(401);
});

Integration with CI/CD

name: Improve Coverage

on:
  workflow_dispatch:
  schedule:
    - cron: "0 0 * * 0"  # Weekly

jobs:
  coverage:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
      - run: npm ci
      - uses: teliha/dev-workflows/.github/actions/improve-coverage@main
        with:
          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
          github_token: ${{ secrets.GITHUB_TOKEN }}

Test Coverage Improvement Skill - Detailed process
Code Review Command - Review including test coverage

/improve-coverage