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This feature is in beta.

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Platform support

Version control

GitHub (GitLab and Bitbucket coming soon)

CI/CD integration

GitHub Actions (automatic build failure resolution)
Unit Test Generation AI coding tools let you write code 10x faster, but comprehensive testing still happens manually. CodeRabbit bridges this gap by analyzing your code changes and generating sophisticated unit tests that understand your project’s patterns, testing frameworks, and edge cases.

PR comment command

Type @coderabbitai generate unit tests in any PR comment to generate tests automatically

UI checkbox

Use the Generate unit tests checkbox in the CodeRabbit Walkthrough for one-click generation

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How it works

1

Request test generation

Comment @coderabbitai generate unit tests in your PR or check the box in CodeRabbit Walkthrough
2

Context-aware analysis

CodeRabbit examines your code changes with full context - understanding your testing frameworks, existing patterns, and team guidelines from previous reviews to identify what needs coverage
3

Intelligent test generation

Tests are generated based on your project’s specific context, including proper mocking strategies, framework conventions, and edge cases that matter for your codebase
4

Choose delivery method

Receive tests via separate PR, new commit in current PR, or comment to copy-paste
5

Automatic CI integration

For separate PRs, CodeRabbit analyzes your GitHub Actions workflows and fixes build failures, import errors, and dependency issues automatically
CodeRabbit’s test generation goes beyond basic templates. It understands your project’s testing patterns and generates tests that actually integrate with your existing test suite.

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Output delivery options

Recommended for most teams CodeRabbit creates a new pull request containing all generated tests. This approach keeps your feature PR focused while allowing independent review of test code. Key advantage: CodeRabbit automatically fixes CI/CD integration issues. If tests fail due to missing dependencies, import errors, or configuration problems, CodeRabbit analyzes your GitHub Actions logs and pushes fixes. This means you get working tests, not just test code that looks right.

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Path-specific customization

Configure test generation for different parts of your codebase using .coderabbit.yaml: 
code_generation:
  unit_tests:
    path_instructions:
      - path: "**/*.ts"
        instructions: |
          Use vitest for testing framework.
          Generate comprehensive test cases including edge cases and error conditions.
          Include proper TypeScript types in test expectations.
      - path: "**/api/**"
        instructions: |
          Focus on request/response validation and error handling.
          Mock external API calls using MSW.
          Test authentication middleware and rate limiting.
      - path: "**/components/**"
        instructions: |
          Use React Testing Library for component tests.
          Test user interactions, accessibility, and error boundaries.
          Mock complex props and verify state changes.
These instructions become part of CodeRabbit’s context for future test generation, continuously improving test quality and consistency across your codebase. Unit test generation is part of CodeRabbit’s finishing touches - adding the comprehensive test coverage that ensures code quality and maintainability.