Use for test coverage with Bun, --coverage flag, lcov reports, thresholds, and CI integration.
Runs Bun test coverage commands with thresholds, reporters, and CI integration. Use when generating coverage reports, setting quality gates, or configuring lcov output for CI pipelines.
/plugin marketplace add secondsky/claude-skills/plugin install bun@claude-skillsThis skill inherits all available tools. When active, it can use any tool Claude has access to.
Bun has built-in code coverage reporting without additional dependencies.
# Enable coverage
bun test --coverage
# With threshold (fail if below)
bun test --coverage --coverage-threshold 80
[test]
coverage = true
coverageThreshold = 0.8 # 80% minimum
coverageDir = "./coverage"
# Patterns to ignore
coverageSkipTestFiles = true
------------------|---------|---------|-------------------
File | % Funcs | % Lines | Uncovered Line #s
------------------|---------|---------|-------------------
All files | 85.71 | 89.23 |
src/index.ts | 100.00 | 100.00 |
src/utils.ts | 75.00 | 82.35 | 23-25, 41-43
src/api.ts | 80.00 | 85.00 | 67, 89-92
------------------|---------|---------|-------------------
# Default console output
bun test --coverage
# Generate lcov report
bun test --coverage --coverage-reporter=lcov
# Multiple reporters
bun test --coverage --coverage-reporter=text --coverage-reporter=lcov
| Reporter | Output |
|---|---|
text | Console table (default) |
lcov | coverage/lcov.info for CI tools |
json | coverage/coverage.json |
Set minimum coverage requirements:
# Fail if coverage < 80%
bun test --coverage --coverage-threshold 80
# Per-metric thresholds in bunfig.toml
[test]
coverage = true
coverageThreshold = {
lines = 80,
functions = 75,
branches = 70
}
[test]
coverage = true
# Skip test files from coverage
coverageSkipTestFiles = true
# Patterns to exclude
coverageIgnore = [
"**/*.test.ts",
"**/fixtures/**",
"**/mocks/**"
]
- name: Run tests with coverage
run: bun test --coverage --coverage-reporter=lcov
- name: Upload coverage to Codecov
uses: codecov/codecov-action@v5
with:
files: ./coverage/lcov.info
# Custom output directory
bun test --coverage --coverage-dir=./reports/coverage
import { test, expect } from "bun:test";
// Get coverage data programmatically
const coverage = Bun.coverage;
// Access after tests complete
process.on("exit", () => {
console.log(coverage.getCoverageData());
});
| Error | Cause | Fix |
|---|---|---|
Coverage threshold not met | Coverage below threshold | Increase test coverage |
No coverage data | Files not executed | Check test includes file |
lcov not found | Missing reporter | Add --coverage-reporter=lcov |
Load references/reporters.md when:
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