Bun's test runner supports built-in code coverage reporting via the --coverage flag.
bun test --coverage
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 set a minimum coverage threshold, add the following line to your bunfig.toml. This requires that 90% of your codebase is covered by tests.
[test]
# to require 90% line-level and function-level coverage
coverageThreshold = 0.9
If your test suite does not meet this threshold, bun test will exit with a non-zero exit code to signal a failure.
bun test --coverage<test output>echo $?1 # this is the exit code of the previous commandDifferent thresholds can be set for line-level and function-level coverage.
[test]
# to set different thresholds for lines and functions
coverageThreshold = { line = 0.5, function = 0.7 }
See Docs > Test runner > Coverage for complete documentation on code coverage reporting in Bun.