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---
title: "Filing Bugs"
linkTitle: "Filing Bugs"
type: docs
weight: 10
description: >
How to file bugs and fix Kustomize bugs
---
[krusty package]: https://github.com/kubernetes-sigs/kustomize/tree/master/api/krusty
[reusable custom transformer test]: https://github.com/kubernetes-sigs/kustomize/tree/master/api/krusty/customconfigreusable_test.go
[example PR]: https://github.com/kubernetes-sigs/kustomize/pull/4683
File [issues](https://github.com/kubernetes-sigs/kustomize/issues) as desired, but if you've found a problem
with how `kustomize build` works, please report:
* the output of `kustomize version`,
* the input (the content of `kustomization.yaml`
and any files it refers to),
* the expected YAML output.
## If you have `go` installed
kustomize has a simple test harness in the [krusty
package] for specifying a kustomization's input and the
expected output.
Copy one of those tests, e.g. this [reusable custom
transformer test], to a new test file in the
krusty package.
Insert the inputs you want to use, and run it as
you'd run the reusable custom transformer test:
```
(cd api; go test -run TestReusableCustomTransformers ./krusty)
```
The output will demonstrate the bug or missing feature.
Record this output in the test file in a call to
`AssertActualEqualsExpected`, per all the other tests
in the [krusty package]. This makes the test pass,
albeit with output demonstrating behavior you
presumably want to change.
Send the new test in a PR, along with commentary (in
the test) on what you'd prefer to see. You can refer to this [example PR]
The person who fixes the bug then has a clear bug
reproduction and a test to modify when the bug is
fixed.
Any bug fix first requires a test demonstrating the bug
(so we have permanent regression coverage), so if the
_bug reporter_ does this, it saves time and avoids
misunderstandings.