test/

Testing strategy

This document describes the desired testing strategy for the project, which should slowly be implemented over time.

This is a live document and should be updated as the project evolves, to cover details like api testing or benchmarking.

Introduction

This project is a complex system with many moving parts. It is important to have a coherent testing strategy to ensure that the system works as expected, doesn't break over time, and very importantly, make sure that developers know where and how to test things.

As testing tools we use two frameworks:

• Ginkgo and Gomega, a BDD-style testing framework for Go, used for more complex testing where BeforeEach/AfterEach is beneficial. It has the benefit of allowing to write tests in a more human-readable way.

• Go's built-in testing framework with testify, used for simpler unit tests.

Internal test libraries

We maintain our internal test libraries in /test/pkg/

Types of tests

Unit testing

Unit tests are used to test individual functions or methods in isolation. They should be fast, and should not depend on external services or databases.

Cross-package tests can be performed sometimes in our unit testing, as long as there is no dependency on the database or other services functionality.

We keep the test files for unit tests in the same directory as the code we are testing.

i.e.

code in pkg/log/log.go should have unit tests in pkg/log/log_test.go

We use the go unit test framework with testify for unit tests.

Unit tests can be run locally with:

make unit-test

Mocking

Sometimes we need to mock interfaces to make unit testing possible in isolation. For that we use the mockgen tool from go.uber.org/mock

If you want to generate mocks for a package, you can add the reference to /hack/mock.list.txt and run make generate to generate the mocks.

Find more information about using mockgen here

Integration testing

Tests the interactions between our different software components in a mocked environment, here we are not testing dependencies with the operating system or external services (beyond the database) and we are not deploying the components of the system, but we run instances of our objects from the go tests.

External systems or OS interaction are mocked.

Those tests are stored on a separate directory /test/integration/<topic>, i.e. we can test the following topics:

• agent
• storage
• server-api
• cmdline

We use ginkgo/gomega for these tests, as they are more complex and require more setup and teardown than unit tests.

Tests made for integration testing can be built with the testing harness provided in /test/pkg/harness which provides an object to test a server and an agent together, building any necessary crypto material, providing a test database and a mock directory for the agent to interact with.

can be run with:

make integration-test # or run-integration-test if you have a DB/deployment ready

For mocking specific interfaces please refer to the unit-test mocking section.

Note on coverage testing

We run all unit tests and integration testing separately, but we provide a separate make target that provides unified coverage results by merging coverage output from unit and integration tests using the go coverage tools.

make coverage

E2E testing

This type of testing verifies the interaction of our software components with external software or services, such as the operating system, registries, git repositories, etc.

Our stack helps deploy a complete system with make deploy and this stack should provide everything necessary to perform e2e testing.

We maintain the end-to-end test files in /test/e2e/<topic> directory, ie. /test/e2e/agent/, /test/e2e/cli/, etc.

as examples:

• agent contains tests for the agent component in interaction with the OS and registries: switching an image, rebooting, failure and rollback, etc.

• gitops contains tests for the server that verify interaction with external git repositories.

• k8s/secrets contains for the server that verify interaction with a k8s API in terms of secret retrieval.

• cli contains tests for the command line interface flightctl

E2E tests can be run with our testing harness in /test/pkg/harness/e2e which provides additional functionality on top of /test/pkg/harness to interact with agents on VMs, or connect the server to the local kind k8s cluster.

We use ginkgo/gomega for these tests, as they are more complex and require more setup and teardown than unit tests.

Filtering the e2e test run

You can filter which e2e tests to run by pointing to the e2e directory using the GO_E2E_DIRS environment variable.

For example, if we wanted to run only the cli tests, we could execute

make e2e-test GO_E2E_DIRS=test/e2e/cli

or, if we ran e2e-test before and all the necessary artifacts and deployments are in place, we could speed up furter by using the run-e2e-test target.

make run-e2e-test GO_E2E_DIRS=test/e2e/cli

You can also filter by providing the GINKGO_FOCUS environment variable, which will filter the tests by the provided string.

make e2e-test GINKGO_FOCUS="should create a new project"

Environment flags

• FLIGHTCTL_NS - the namespace where the flightctl is deployed, this is used by the scripts to figure out the routes/endpoints.

• KUBEADMIN_PASS - the OpenShift kubeadmin (or user with the right to authenticate to flightctl) password for the cluster, used sometimes to request a token for automatic login.

• DEBUG_VM_CONSOLE - if set to 1, the VM console output will be printed to stdout during test execution.

Local testing side services

For the purpose of providing a local testing environment, we have a set of side services that run inside the kind cluster to provide a complete testing environment. Therefore, kubectl and kind must be installed.

Local container registry

Running on ${IP}:5000 and localhost:5000, exposed via TLS, we configure the test host to consider that an insecure registry, but we configure the agents to trust the CA generated by the test/scripts/create_e2e_certs.sh script.

For E2E testing we build several agent images that we push into this registry, that we use to exercise the agent and update through in the tests, more details can be found here Agent Images

Local ssh+git server

Running on ${IP}:3222 and localhost:3222, authentication to this repository can be performed with the bin/.ssh/id_rsa key with the user user, the git ssh connection also accepts the user password.

This is an example ~/.ssh/config entry, assuming that flightctl is checked out in ~/flightctl and deployed with make deploy:

Host gitserver
     Hostname localhost
     Port 3222
     IdentityFile ~/flightctl/bin/.ssh/id_rsa

Connection via ssh allows three commands:

• create-repo - creates a new git repository with the given name
• delete-repo - deletes the git repository with the given name
• quit/exit - closes the connection

Example:

$ ssh user@gitserver -p3222
git> create-repo test1
Initialized empty Git repository in /home/user/repos/test1.git/
git> create-repo test2
Initialized empty Git repository in /home/user/repos/test2.git/
git> delete-repo test1
git> delete-repo test2
git> quit
Connection to 192.168.1.10 closed.

Repositories can be accessed as:

git clone user@gitserver:repos/test1.git

Running E2E tests

make e2e-test

Running E2E with an existing cluster

If you have a cluster already running, you can run the tests with:

export FLIGHTCTL_NS=flightctl
export KUBEADMIN_PASS=your-oc-password-for-kubeadmin

make in-cluster-e2e-test

You can also use FLIGHTCTL_RPM=release/0.3.0, FLIGHTCTL_RPM=devel/0.3.0.rc1-5.20241104145530808450.main.19.ga531984 or simply FLIGHTCTL_RPM=release or FLIGHTCTL_RPM=devel to consume an specific version/repository of the CLI and agent rpm.

I.e. if you wanted to test the cluster along with the 0.3.0 release in https://copr.fedorainfracloud.org/coprs/g/redhat-et/flightctl/builds/, you would run:

export FLIGHTCTL_NS=flightctl
export KUBEADMIN_PASS=your-oc-password-for-kubeadmin
export FLIGHTCTL_RPM=release/0.3.0

make in-cluster-e2e-test

If you wanted to test the cluster along with the latest devel build in https://copr.fedorainfracloud.org/coprs/g/redhat-et/flightctl-dev/builds/, you could use run:

export FLIGHTCTL_RPM=devel/0.3.0.rc2-1.20241104145530808450.main.19.ga531984

make in-cluster-e2e-test

If your host system is not suitable for bootc image builder

• Create a test vm. Note the ssh command in the cmd output.

make deploy-e2e-ocp-test-vm

• Ssh into the vm.

ssh kni@${VM_IP}

• Continue inside the vm

cd ~/flightctl

export FLIGHTCTL_NS=flightctl
export KUBEADMIN_PASS=your-oc-password-for-kubeadmin
export API_SERVER=your-oc-api-server

oc login -u kubeadmin -p ${KUBEADMIN_PASS} ${API_SERVER}

oc delete ns flightctl-e2e

make clean build in-cluster-e2e-test

Command line tool testing

Today we test the command line tool using the bash/github actions, we may want to migrate this under integration testing in the future as described in the integration testing section.

For more details look at the .github/workflows/pr-smoke-testing.yaml

Future work

Additional testing will be analyzed in the future, including:

• upgrade testing between versions
• load testing
• scale testing