mirror of
https://github.com/oven-sh/bun
synced 2026-02-11 11:29:02 +00:00
d329278996
Adds a new `--coverage-changes` CLI flag for `bun test` that reports code coverage
specifically for lines that changed compared to a base branch (default: main).
Features:
- Merged coverage table with "% Chang" column showing coverage for changed lines only
- AI agent detection (AGENT=1 or CLAUDECODE env) outputs XML prompts for uncovered code:
- `<file>` tags for uncovered line ranges
- `<function>` tags for entirely uncovered new functions with correct line numbers
- Exits with code 1 if changed lines coverage is below threshold (default 90%)
- Skips test files from changed lines tracking when coverageSkipTestFiles is enabled
- Uses bun.Ordinal for unambiguous line number handling (0-indexed internal, 1-indexed display)
Usage:
bun test --coverage --coverage-changes # Compare against main
bun test --coverage --coverage-changes=develop # Compare against develop
Example output with AI agent prompts (AGENT=1):
```
File | % Funcs | % Lines | % Chang | Uncovered Line #s
lib.ts | 50.00 | 66.67 | 0.00 |
Coverage for changed lines (0.00%) is below threshold (90.00%)
<errors>
<file path="lib.ts">
In lib.ts, lines 5 do not have test coverage. Write tests to cover these lines.
</file>
<function path="lib.ts" startLine="5" endLine="6">
In lib.ts, the function at lines 5-6 is never called. Write a test that calls this function, or delete it if it is dead code.
</function>
</errors>
```
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>