The Challenge
Code coverage metrics tell you a percentage—they don’t tell you whether the right things are tested. A PR can show 80% coverage while critical error paths, boundary conditions, and failure scenarios remain entirely untested.
Common test coverage problems that slip through review:
- Happy-path-only tests that ignore failure modes and boundary inputs
- New code paths introduced in a PR that existing tests don’t reach
- Error handling blocks that are written but never actually exercised
- Edge cases in business logic that only manifest with unusual but valid inputs
- Integration points where one component’s output is another’s untested input
The result: code that appears tested but fails in production under conditions that were entirely predictable.
The Autohive Solution
Autohive Code Quality Review evaluates test coverage not as a number, but as a question: which execution paths in this code are not covered by tests, and which scenarios could cause a failure that no test would catch?
Untested Code Path Detection
By reading the full implementation alongside the test files, the agent identifies execution branches, error handlers, and conditional paths that tests don’t reach—providing specific guidance on what scenarios need coverage.
Edge Case Test Gap Analysis
The agent evaluates whether tests cover meaningful boundary conditions: empty collections, null inputs, maximum values, concurrent access, and failure states that are likely to occur in real usage.
Error Handling Verification
Error handling code that’s written but never invoked by tests provides false confidence. The agent flags error handlers without corresponding test scenarios and explains what test cases would properly exercise them.
Test Coverage Insights
Rather than just flagging gaps, the agent explains which scenarios lack testing and suggests what should be covered—giving contributors clear direction on how to improve their test suite before merge.
Benefits
- Genuine merge confidence – Know that the code has been tested against realistic failure conditions, not just ideal inputs
- Fewer production surprises – Catch scenarios that testing gaps would have left vulnerable
- Better contributor learning – Clear, specific feedback teaches developers what good test coverage looks like
- Reduced review effort – Human reviewers don’t need to mentally simulate every execution path to find gaps
How It Works
- Submit a PR with new code – A contributor opens a pull request adding features, fixing bugs, or refactoring existing functionality
- Implementation and test analysis – The agent reads both the implementation files and test files in full, understanding what’s implemented and what’s tested
- Coverage gap identification – Untested paths, missing edge cases, and unexercised error handlers are identified and explained
- Specific feedback delivered – Inline comments explain which scenarios are missing tests and what those tests should verify
- Tests added before merge – The contributor addresses coverage gaps before the PR is approved, ensuring the codebase merges with meaningful test coverage
Getting Started
- Sign up at app.autohive.com
- Connect the Autohive Code Quality Review agent from the marketplace
- Configure it to run on all pull requests that include new or modified code
- Use the coverage feedback as a required review step before PR approval
