Test Machinery

• Test Machinery
  • Usage
    • Write your own tests (integrate into the testmachinery)
    • TestMachinery Deployment
    • Developing tests locally
    • Use private images
    • Use with GitHub Authentication
    • Testrunner
  • Local TestMachinery development

Read the design draft here.

The TestMachinery is a k8s controller that watches a k8s cluster for Testruns and executes the tests in the specified order as an argo workflow.

Testruns reference tests by name or label in the testrun.spec.testflow. An additional exit flow can be specified in testrun.spec.onExit. The exit flow is called based on the success condition of the testflow.

The tests themselves are described as TestDefinition and specify the execution of a test such as the command or the image that should run. TestDefinitions are described as a Kubernetes resource but are just used as configuration file by the testmachinery. If a TestRun enumerates tests by a label, all TestDefinitions that are found in the given locations and match that label are executed in parallel.

The TestMachinery searches the locations in testrun.spec.locationSets (in the .test-defs folder) for the TestDefinition (specified by name and label in the testFlow and onExit), executes them with the provided global and local config and mounts the files of the location to the container where the TestDefinition is found. Accordingly, TestDefinitions do not need to be deployed to the k8s cluster. They are automatically picked up and parsed by the testmachinery.

Currently there are 2 location types available:

• git: searches a remote git respository for TestDefinitions (Note: The k8s cluster hosting the TestMachinery has to run in corporate network if git repositories from the internal github are specified)
• local: searches a local file path for TestDefinitions

The TestMachinery parses the TestRun definition and generates an argo workflow that executes the test flow. After the argo workflow has finished (either successful or with failure), the TestMachinery collects the results (phase, duration, ...) and updates the status of the TestRun.

Furthermore, generated artifacts that are stored in the s3 storage are deleted after the TestRun is deleted from the cluster.

Usage

Write your own tests (integrate into the testmachinery)

See docs/GetStarted

TestMachinery Deployment

1. Setup a k8s cluster (min. Version 1.10.x, preferred Version: 1.12.x, minikube is also suitable)
2. Install prerequisites (argo, minio and the Testrun CRD) with make install
   • The default namespace is default; another namespace can be defined with make install NS=namespace-name
3. Install the TestMachinery with make install-controller. Then the controller alongside to a service, validation webhooks and needed rbac permissions is installed.
4. TestRuns can be executed by creating them with kubectl create -f path/to/testrun.yaml (examples can be found in the examples folder)

Prerequisite: the TestMachinery and the TestRuns have to reside in the same namespace due to cross-namespace issues of the argo workflow engine.

Developing tests locally

TestRuns and TestDefinitions can be developed locally in a minikube cluster so that no remote installation is needed. To develop a TestRun locally the TestMachinery has to be installed as described in TestMachinery Deployment.

If a local TestDefinition is developed, the TestMachinery has to be started in insecure mode to mount hostPaths:

• the TestDefinition root folder has to be mounted to the minikube cluster with make mount-local path=path/to/folder
• the TestDefinition itself has to be in the directory path/to/folder/.test-defs.
• the TestMachinery itself has to be installed with make install-controller-local which starts the controller in insecure mode and mounts the previously specified folder to the controller pod.

Use private images

Images from private repositories can be used by

1. adding corresponding pull-secrets to the kubernetes cluster (see https://cloud.google.com/container-registry/docs/advanced-authentication and https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/)
2. add the name of the created secret to the Testmachinery ConfigMap tm-config --> .data.secrets.PullSecrets

These secrets can be added during runtime as the testmachinery fetches these secrets for every new run.

Use with GitHub Authentication

The Testmachinery uses no authentication for GitHub by default. To enable private repositories or increase the rate limit of GitHub; a GitHub config with an user needs to be added for authentication. Adding a new GitHub config requires the following steps:

1. Create a GitHub config file in the format:

secrets:
    - sshUrl: ssh://git@github.com         // change if you want to add configs for different github enterprise instances
      httpUrl: https://github.com
      apiUrl: https://api.github.com
      disable_tls_validation: true
      webhook_token:
      technicalUser:
        username:
        password:
        emailAddress:
        authToken:
    - ...

2. Encode the config file in base64 and the encoded data to config.yaml key in examples/gh-secrets.yaml.
3. Deploy the secret into the same namespace as the controller.

Another GitHub instance can be added editing the exiting secret and change the base64 encoded data.

Testrunner

See testrunner docs

Local TestMachinery development

For local development of the TestMachinery itself, the prerequisites from TestMachinery Deployment from step 1 to step 3 have to be performed (skip step 4, we don't want to deploy the TestMachinery controller into the cluster as it should run locally). Afterwards the controller can be started locally with make run-local KUBECONFIG=/path/to/.kube/config. It is then automatically compiled, started in insecure mode and watches for TestRuns in the specified cluster.