Set a code coverage threshold with the Bun test runner
Bun's test runner supports built-in code coverage reporting via the --coverage flag.
sh
bun test --coverage
txt
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() calls
To set a minimum coverage threshold, add the following line to your bunfig.toml. This requires that 90% of your codebase is covered by tests.
toml
[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.
sh
bun test --coverage
txt
<test output> $ echo $? 1 # this is the exit code of the previous command
Different thresholds can be set for line-level and function-level coverage.
toml
[test]
# to set different thresholds for lines and functions
coverageThreshold = { lines = 0.5, functions = 0.7 }
See Docs > Test runner > Coverage for complete documentation on code coverage reporting in Bun.