Share Test Code
In order to make the CI workflow reliable and efficient it is crucial to keep the test coverage in a good shape at all times. Sharing test code between several packages (even within multiple branches of the same package) may significantly help to:
Prevent test code duplication
Minimize test maintenance
Catch incompatibilities early
In general, tests define how the software works and the basic functionality of many packages doesn’t change that often. We try hard to keep the backward compatibility where possible. Thus it seems natural that, for such components, tests guarding the spec could change at a slower pace than the distribution branches.
See the whole ci-list discussion for some more context.
Store test code in your preferred repository and reference the tests from the dist-git yaml file. There is also a special
tests namespace dedicated for storing Fedora CI integration tests:
fedpkg to quickly clone repositories from the tests namespace:
fedpkg clone tests/shell
Enabling tests from a remote repository using tmt is straightforward:
discover: how: fmf url: https://src.fedoraproject.org/tests/shell.git
See the discover step documentation for more details.
Some of the Standard Test Roles (currently basic and beakerlib) support fetching test code from remote repositories directly in their config in this way:
- role: standard-test-beakerlib repositories: - repo: "https://src.fedoraproject.org/tests/shell.git" dest: "shell"
It is also possible to specify version (branch, commit hash) which should be fetched from the remote repository:
- role: standard-test-beakerlib repositories: - repo: "https://src.fedoraproject.org/tests/shell.git" dest: "shell" version: "devel"
It is a good idea to ensure that updating tests in the shared repository does not negatively impact packages which they are testing. To enable pull request pipeline for tests stored in the Fedora dist git tests namespace simply include
tests.yml file in the root of the test repository.
- hosts: localhost roles: - role: standard-test-basic tags: - classic tests: - smoke27: dir: smoke run: VERSION=2.7 METHOD=virtualenv ./venv.sh - smoke36: dir: smoke run: VERSION=3.6 METHOD=virtualenv ./venv.sh - smoke37: dir: smoke run: VERSION=3.7 METHOD=virtualenv ./venv.sh required_packages: - python27 - python36 - python37
The example above is a simplified version of the tests.yml file from the Python shared test repo and shows how to enable
smoke test to be executed against three versions of the Python interpreter.
Here are some real-life examples where sharing test code can increase long-term efficiency.
There are several shells which implement the POSIX specification:
All of them share a significant amount of test coverage and it does not make sense to commit & maintain identical tests in five different repositories (+ possible branches).
Shell tests repository:
- hosts: localhost roles: - role: standard-test-beakerlib tags: - classic repositories: - repo: "https://src.fedoraproject.org/tests/shell.git" dest: "shell" tests: - shell/func - shell/login - shell/smoke required_packages: - expect # login requires expect - which # smoke requires which
- hosts: localhost roles: - role: standard-test-beakerlib tags: - classic repositories: - repo: "https://src.fedoraproject.org/tests/shell.git" dest: "shell" tests: - shell/func - shell/login - shell/smoke environment: PACKAGES: ksh SH_BIN: ksh required_packages: - ksh - expect # login requires expect - which # smoke requires which
Another example is Ruby: With about 80 packages related to Ruby on Rails it would be useful and efficient to have a single place for integration tests which verify that the framework is correctly working after updating any of these packages. Conversely, maintaining those tests in 80 repos would be a tedious task.
Currently the shared tests/ruby repository hosts these three ruby integration tests:
systemtap-static-probes-in-ruby - exercising ruby’s systemtap api
bundler-unit-test - run bundler’s unit tests
run-basic-rails-application - run a simple rails application
In order to create a new repository in the tests namespace use the fedpkg’s
request-tests-repo command. For example to create a shared test repository with the name foo, which will be available at https://src.fedoraproject.org/tests/foo.git
Setup authentication to pagure according to the help in request-repo command
fedpkg request-repo -h
Request a new repository with a sensible decription
fedpkg request-tests-repo foo "Description of the repository"
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