Guides Test Runner
Generate code coverage reports with the Bun test runner
Bun's test runner has built-in code coverage reporting. Use it to see how much of your codebase is covered by tests, and where the gaps are.
Pass the --coverage flag to bun test to print a coverage report after the test run.
The report lists the source files the tests executed, the percentage of functions and lines that ran, and the line ranges that never ran.
$ bun test --coverage
bun test v1.3.14 (9c68abdb)
test.test.ts:
✓ math > add [0.71ms]
✓ math > multiply [0.03ms]
✓ random [0.13ms]
-------------|---------|---------|-------------------
File | % Funcs | % Lines | Uncovered Line #s
-------------|---------|---------|-------------------
All files | 66.67 | 77.78 |
math.ts | 50.00 | 66.67 |
random.ts | 50.00 | 66.67 |
-------------|---------|---------|-------------------
3 pass
0 fail
3 expect() callsTo enable coverage reporting by default, add the following to your bunfig.toml:
[test]
coverage = true # always enable coverageSee Code coverage.