GitOps-Powered Kubernetes Testing Machine: ArgoCD + Testkube

March 15, 2022
Est. reading time:
8 min.
Adopt the GitOps development process when creating tests for your cloud native application using Testkube and ArgoCD!
Abdallah Abedraba
Technical Developer Advocate
Kubeshop
Table of Contents
GitOps-Powered Kubernetes Testing Machine: ArgoCD + Testkube

## Introduction: Challenges to GitOps Cloud Native Testing 

One of the major trends in contemporary cloud native application development is the adoption of GitOps; managing the state of your Kubernetes cluster(s) in Git - with all the bells and whistles provided by modern Git platforms like GitHub and GitLab in regard to workflows, auditing, security, tooling, etc. Tools like ArgoCD or Flux are used to do the heavy lifting of keeping your Kubernetes cluster in sync with your Git repository; as soon as difference is detected between Git and your cluster it is deployed to ensure that your repository is the source-of-truth for your runtime environment.

Don’t you agree that it’s time to move testing and related activities into this paradigm also? Exactly! We at Kubeshop are working hard to provide you with the first GitOps-friendly Cloud-native test orchestration/execution framework - Testkube - to ensure that your QA efforts align with this new and shiny approach to application configuration and cluster configuration management. Combined with the GitOps approach described above, Testkube will include your test artifacts and application configuration in the state of your cluster and make git the source of truth for these test artifacts. And it’s Open-Source too. For more on Testkube, check out the introduction blog, ["Hello Testkube"](https://kubeshop.io/blog/hello-testkube-power-to-testers-on-k8s).

Benefits of the GitOps approach:

  1. Since your tests are included in the state of your cluster you are always able to validate that your application components/services work as required.
  2. Since tests are executed from inside your cluster there is no need to expose services under test externally purely for the purpose of being able to test them.
  3. Tests in your cluster are always in sync with the external tooling used for authoring
  4. Test execution is not strictly tied to CI but can also be triggered manually for ad-hoc validations or via internal triggers (Kubernetes events) 
  5. You can leverage all your existing test automation assets from Postman, or Cypress (even for end-to-end testing), or … through executor plugins.

Conceptually, this can be illustrated as follows:

GitOps Tutorial

Enough talk - let’s see this in action - here comes a step-by-step walkthrough to get this in place for the automated application deployment and execution of Postman collections in a local Minikube cluster to test.

Let’s start with setting things up for our GitOps-powered testing machine!

Installations for GitOps Testing

  1. Install Minikube

You can follow the minikube installation for your operating system here.

  1. Install ArgoCD

Follow the ArgoCD installation guide.

Note: For step 3 “ Access The Argo CD API Server”, choose the “Port Forwarding” method, as that is the easiest way to connect to it with a Minikube cluster. 

  1. Install Testkube

Follow the installation guide for Testkube here. Make sure to install the CLI client and the components in your cluster.

Set up "Hello Kubernetes" application and tests

  1. Install a “Hello Kubernetes!” application in your cluster

We will create a YAML file for a simple “Hello Kubernetes” application that we will then create our integration tests against. 

Create the file hello-kubernetes.yaml

And deploy the Hello Kubernetes deployment with:

kubectl apply -f hello-kubernetes.yaml

You can test that your application has been correctly installed by running:

minikube service hello-kubernetes-service

  1. Set up a Git Repository containing some Postman collections

We are going to use tests created by Postman and exported in a Postman collections file.

We can upload this to the same Git Repository as our application, but in practice the repository could be the same repository hosting the application or it could also be in a separate repository where you manage all your test artifacts.

So let’s create our postman-collections.json and push it to the repository.

You can see an example of how the repository should look like here

Configure ArgoCD to work with Testkube

  1. Configure ArgoCD to use the Testkube plugin
To get ArgoCD to use Testkube, we need to add Testkube as a plugin. For that we have built a customized argocd-repo-server container image that will include Testkube as a binary.

Patch the ArgoCD repo-server pod image

And apply it with the following command:

kubectl patch deployments.apps -n argocd argocd-repo-server --type json --patch-file patch.yaml


    7. Define Testkube as a plugin in ArgoCD’s Configuration Management Plugin

Create the file argocd-plugins.yaml

As you can see here, we’re using the command testkube generate tests-crds which creates the Custom Resources (manifests) that ArgoCD will then add to our cluster. Apply the patch with the command:

kubectl patch -n argocd configmaps argocd-cm --patch-file argocd-plugin.yaml

    8. Configure an ArgoCD application to manage test collections in your cluster

Create the file testkube-application.yaml

Notice that we have defined path: postman-collections which is the test folder with our Postman collections from the steps earlier. With Testkube you can use multiple test executors like curl for example, so it is convenient to have a folder for each. We have also defined the .destination.namespace to be testkube, which is where the tests should be deployed in our cluster.

Now let’s create the application with:

kubectl apply -f testkube-application.yaml

    9. Run the initial ArgoCD sync and check your cluster

On ArgoCD’s dashboard, we will now see the newly created application. Let’s click to get into it and sync our tests. 

And now click on Sync to see your tests created.

 And voilà, there’s our test collection created and managed by ArgoCD with every new test created and updated in the Github repository containing the tests!

Run your ArgoCD tests!

    10. Run ad-hoc tests from the CLI

Now that we’re all set - let’s try some ad-hoc test execution using Testkube’s CLI

List the tests in your cluster with:

You should see your deployed test artifacts

To run those tests execute the following command:

$ kubectl-testkube tests run hello-kubernetes

The test execution will start in the background, you now need to copy the command from the image below to check the result of the execution of the test

$ kubectl testkube tests execution EXECUTION_ID

And you should see that the tests have run successfully, just like in the image below.

     11. See test results in the Testkube dashboard

You can also see the results of your tests in a nice dashboard. Just open the Testkube dashboard with the following command

kubectl-testkube dashboard

And you will be able to see the results of the execution in the Executions tab as seen in the image below.

    12. Test the flow: update the test and deploy the updated test with ArgoCD

Let’s add an additional test to our collection. Replace the content our existing test in hello-kubernetes.json with the following:

As you can see, we have added a request status check. Now commit this change to the Github repository. 

If you now go to ArgoCD’s dashboard you’ll see that your tests are out of sync with the deployed artifacts.

 Click on Sync again and apply the changes. With that, your test artifacts are back in sync!

Wow - that was quite a lot to get through but we ended up with something really neat - an automated test deployment and execution pipeline based on GitOps principles!

GitOps Takeaways

Once fully realized - using GitOps for testing of Kubernetes applications as described above provides a powerful alternative to a more traditional approach where orchestration is tied to your current CI/CD tooling and not closely aligned with the lifecycle of Kubernetes applications.

Would love to get your thoughts on the above approach - over-engineering done right? Waste of time? Let us know!

Check Testkube on GitHub — and let us know if you’re missing something we should be adding to make your k8s resource testing easier.

Thank you!

Tags:
tutorial
ArgoCD
Testing
GitOps

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