Cloud / HELM Interview Questions
How do you implement Helm chart testing with Terratest and other tools?
Chart testing ensures reliability before production deployment. Multiple tools provide different testing approaches.
1. Helm unittest (native Helm testing):
# tests/deployment_test.yaml
suite: test deployment
templates:
- deployment.yaml
tests:
- it: should create deployment with proper labels
asserts:
- isKind:
of: Deployment
- hasDocuments:
count: 1
- equal:
path: metadata.labels.app
value: myapp
- equal:
path: spec.replicas
value: 3
- matchRegex:
path: spec.template.spec.containers[0].image
pattern: "myapp:.*"
set:
replicaCount: 3
image.tag: latest
Run: helm unittest ./mychart
2. Terratest (Go-based real cluster testing):
package test
import (
"testing"
"github.com/gruntwork-io/terratest/modules/helm"
"github.com/gruntwork-io/terratest/modules/k8s"
)
func TestHelmChart(t *testing.T) {
helmOptions := &helm.Options{
SetValues: map[string]string{
"replicaCount": "3",
"image.tag": "test",
},
}
releaseName := "test-myapp"
namespaceName := "test-namespace"
// Install chart
helm.Install(t, helmOptions, "./mychart", releaseName)
// Verify deployment
deployment := k8s.GetDeployment(t, kubectlOptions, releaseName)
assert.Equal(t, int32(3), *deployment.Spec.Replicas)
// Test connectivity
pod := k8s.GetPod(t, kubectlOptions, releaseName)
tunnel := k8s.NewTunnel(t, kubectlOptions, k8s.ResourceTypePod, pod.Name, 8080, 80)
tunnel.ForwardPort(t)
resp, err := http.Get("http://localhost:8080/health")
assert.NoError(t, err)
assert.Equal(t, 200, resp.StatusCode)
// Cleanup
helm.Delete(t, helmOptions, releaseName, true)
}
3. Chart Testing (ct) tool:
# ct.yaml config
target-branch: main
validate-maintainers: false
chart-dirs:
- charts
helm-extra-args: --timeout 300s
check-version-increment: true
# Run tests
ct lint --config ct.yaml
ct install --config ct.yaml --namespace ct-test
4. Goss integration for validation:
# goss.yaml
http:
http://myapp-service:8080/health:
status: 200
body: ["OK"]
timeout: 1000
command:
kubectl get pods -l app=myapp:
exit-status: 0
stdout:
- Running
5. CI/CD testing pipeline (GitHub Actions):
name: Test Helm Charts
on: [pull_request]
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: helm/kind-action@v1
- name: Run chart tests
run: |
helm unittest ./charts/*/
ct install --config ct.yaml
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