Feature/add tests for immutable cluster parameters

tests/immutable_test.go

@@ -0,0 +1,73 @@
+package tests
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/dchest/uniuri"
+
+	driver "github.com/arangodb/go-driver"
+	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1alpha"
+	"github.com/arangodb/kube-arangodb/pkg/client"
+)
+
+
+// TestImmutableStorageEngine
+// Tests that storage engine of deployed cluster cannot be changed
+func TestImmutableStorageEngine(t *testing.T) {
+	longOrSkip(t)
+	c := client.MustNewInCluster()
+	kubecli := mustNewKubeClient(t)
+	ns := getNamespace(t)
+
+	// Prepare deployment config
+	depl := newDeployment("test-ise-" + uniuri.NewLen(4))
+	depl.Spec.Mode = api.DeploymentModeCluster
+	depl.Spec.SetDefaults(depl.GetName())
+
+	// Create deployment
+	apiObject, err := c.DatabaseV1alpha().ArangoDeployments(ns).Create(depl)
+	if err != nil {
+		t.Fatalf("Create deployment failed: %v", err)
+	}
+
+	// Wait for deployment to be ready
+	if _, err := waitUntilDeployment(c, depl.GetName(), ns, deploymentHasState(api.DeploymentStateRunning)); err != nil {
+		t.Fatalf("Deployment not running in time: %v", err)
+	}
+
+	// Create a database client
+	ctx := context.Background()
+	client := mustNewArangodDatabaseClient(ctx, kubecli, apiObject, t)
+
+	// Wait for cluster to be completely ready
+	if err := waitUntilClusterHealth(client, func(h driver.ClusterHealth) error {
+		return clusterHealthEqualsSpec(h, apiObject.Spec)
+	}); err != nil {
+		t.Fatalf("Cluster not running in expected health in time: %v", err)
+	}
+
+	// Try to reset storageEngine
+	if _, err := updateDeployment(c, depl.GetName(), ns,
+		func(spec *api.DeploymentSpec) {
+			spec.StorageEngine = api.StorageEngineMMFiles
+		}); err != nil {
+			t.Fatalf("Failed to update the StorageEngine setting: %v", err)
+		} 
+
+	// Wait for StorageEngine parameter to be back to RocksDB
+	if _, err := waitUntilDeployment(c, depl.GetName(), ns,
+		func(depl *api.ArangoDeployment) error {
+			if depl.Spec.StorageEngine == api.StorageEngineRocksDB {
+				return nil
+			} 
+			return fmt.Errorf("StorageEngine not back to %s", api.StorageEngineRocksDB)
+		}); err != nil {
+			t.Fatalf("StorageEngine parameter not immutable: %v", err)
+		}
+
+
+	// Cleanup
+	removeDeployment(c, depl.GetName(), ns)
+}