Auto-Test Generation

CodePeel can generate unit tests for your PR changes and open a separate pull request with those tests.

How to Enable

Option 1: Via .codepeel.yml

auto_test:
  enabled: true

Option 2: Via the Dashboard

1. Go to Settings in the sidebar → Automation
2. Toggle Auto-Generate Tests on

The .codepeel.yml setting takes priority if both are configured.

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How It Works

1. CodePeel completes the normal review of your PR
2. Analyzes the diff to identify changed functions, classes, and modules
3. Generates appropriate unit tests for new/modified code
4. Creates a new branch: codepeel/tests-pr-{number}-{timestamp}
5. Opens a PR targeting your feature branch (so tests merge with your code)
6. Posts a comment on your original PR linking to the test PR

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What Gets Generated

CodePeel detects your test framework (Jest, Vitest, Mocha, etc.) and generates tests in the matching style.

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Example

Your PR changes a calculateDiscount function:

export function calculateDiscount(price: number, tier: 'basic' | 'pro' | 'enterprise'): number {
  const rates = { basic: 0.05, pro: 0.15, enterprise: 0.25 };
  return price * (rates[tier] || 0);
}

CodePeel generates:

describe('calculateDiscount', () => {
  it('applies basic tier discount', () => {
    expect(calculateDiscount(100, 'basic')).toBe(5);
  });
  it('applies pro tier discount', () => {
    expect(calculateDiscount(100, 'pro')).toBe(15);
  });
  it('returns 0 for zero price', () => {
    expect(calculateDiscount(0, 'pro')).toBe(0);
  });
});

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What the Generated PR Looks Like

• Branch: codepeel/tests-pr-{number}-{timestamp}
• Title: 🤖 [CodePeel] Auto-Generated Tests for PR #{number}
• Contents: Only test files — no source code changes
• Comment: A link to the test PR is posted on your original PR

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Important Notes

• Auto-test is opt-in — disabled by default
• Tests are suggestions — always review before merging
• Fire-and-forget — test generation failure doesn't affect the main review
• Auto-fix and auto-test can both be enabled — they create separate PRs