adding test for template

modules/helm/template_test.go

@@ -0,0 +1,68 @@
+//go:build kubeall || helm
+// +build kubeall helm
+
+// NOTE: we have build tags to differentiate kubernetes tests from non-kubernetes tests, and further differentiate helm
+// tests. This is done because minikube is heavy and can interfere with docker related tests in terratest. Similarly,
+// helm can overload the minikube system and thus interfere with the other kubernetes tests. To avoid overloading the
+// system, we run the kubernetes tests and helm tests separately from the others.
+
+package helm
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	appsv1 "k8s.io/api/apps/v1"
+
+	"github.com/gruntwork-io/terratest/modules/k8s"
+	"github.com/gruntwork-io/terratest/modules/random"
+)
+
+const (
+	remote2ChartSource  = "https://charts.bitnami.com/bitnami"
+	remote2ChartName    = "nginx"
+	remote2ChartVersion = "13.2.23"
+)
+
+// Test that we can render locally a remote chart (e.g bitnami/nginx)
+func TestRemoteChartRender(t *testing.T) {
+	t.Parallel()
+
+	namespaceName := fmt.Sprintf(
+		"%s-%s",
+		strings.ToLower(t.Name()),
+		strings.ToLower(random.UniqueId()),
+	)
+
+	releaseName := "keda"
+
+	options := &Options{
+		SetValues: map[string]string{
+			"metricsServer.replicaCount":           "999",
+			"resources.metricServer.limits.memory": "1234Mi",
+		},
+		KubectlOptions: k8s.NewKubectlOptions("", "", namespaceName),
+	}
+
+	// Run RenderTemplate to render the template and capture the output. Note that we use the version without `E`, since
+	// we want to assert that the template renders without any errors.
+	// Additionally, although we know there is only one yaml file in the template, we deliberately path a templateFiles
+	// arg to demonstrate how to select individual templates to render.
+	output := RenderRemoteTemplate(t, options, "https://kedacore.github.io/charts", releaseName, []string{"templates/metrics-server/deployment.yaml"})
+
+	// Now we use kubernetes/client-go library to render the template output into the Deployment struct. This will
+	// ensure the Deployment resource is rendered correctly.
+	var deployment appsv1.Deployment
+	UnmarshalK8SYaml(t, output, &deployment)
+
+	// Verify the namespace matches the expected supplied namespace.
+	require.Equal(t, namespaceName, deployment.Namespace)
+
+	// Finally, we verify the deployment pod template spec is set to the expected container image value
+	var expectedMetricsServerReplica int32
+	expectedMetricsServerReplica = 999
+	deploymentMetricsServerReplica := *deployment.Spec.Replicas
+	require.Equal(t, expectedMetricsServerReplica, deploymentMetricsServerReplica)
+}