charmkeeper-tests

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Use this skill when you need to write, update, migrate or fix unit tests.

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Sourceseb4stien/charmkeeper

Added on2026-02-22

NPX Install

npx skill4agent add seb4stien/charmkeeper charmkeeper-tests

Tags

Translated version includes tags in frontmatter

unit-testing test-migration tox-linting charm-testing multipass-usage

SKILL.md Content

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Plan:

Find the unit tests in the repository (their could be multiple "tests/unit" folders).
Ensure each set of unit tests is following the implementation standards.
Run the tests to ensure the code work as expected.

Implementation standards

Unit test should be implemented with
```
ops.testing
```
, not
```
harness
```
.
Lint produced code with
```
tox -e lint
```
.

Testing

Writing unit tests

Unit test must be implemented with
```
ops.testing
```
:
- See How to migrate unit tests from Harness if the charm is currently using harness.
For each charm in the repository, there should be a
```
tests/
```
folder like: https://github.com/canonical/platform-engineering-charm-template/tree/main/tests
- Unit tests goes in
```
tests/unit
```
- Fixtures should look like the ones in https://raw.githubusercontent.com/canonical/haproxy-operator/refs/heads/main/haproxy-operator/tests/unit/conftest.py
- Helper functions should go in
```
tests/unit/helper.py
```
  . See an example here: https://raw.githubusercontent.com/canonical/haproxy-operator/refs/heads/main/haproxy-operator/tests/unit/helper.py
- There is a
```
tests/unit/test_charm.py
```
  to test the basic behaviors of the charm.
- There should be additional
```
tests/unit/test_xxx.py
```
  files to test specific integrations of the charm (see https://github.com/canonical/haproxy-operator/tree/main/haproxy-operator/tests/unit)

Local testing

The unit tests should be run in a virtual machine named "charmkeeper".

If the machine doesn't exist, create it with:

scripts/create-charmkeeper-vm.sh

.

If not already done, mount the working directory folder in the machine with

bash

multipass mount --type native $PWD charmkeeper:/workdir

Look at CONTRIBUTING.md to see if there are specific instructions to test the charm.

Unless there is something specific mentioned, you should be able to run the tests with:

bash

multipass exec charmkeeper -d /workdir/ -- tox