Add cluster creation test

Author: hakman

cmd/kops/create_cluster_integration_test.go

@@ -195,6 +195,11 @@ func TestCreateClusterKarpenter(t *testing.T) {
 	runCreateClusterIntegrationTest(t, "../../tests/integration/create_cluster/karpenter", "v1alpha2")
 }
 
+// TestCreateClusterZeroNodes runs kops create cluster --node-count=0
+func TestCreateClusterZeroNodes(t *testing.T) {
+	runCreateClusterIntegrationTest(t, "../../tests/integration/create_cluster/zero-nodes", "v1alpha2")
+}
+
 func runCreateClusterIntegrationTest(t *testing.T, srcDir string, version string) {
 	ctx := context.Background()
 

tests/integration/create_cluster/zero-nodes/expected-v1alpha2.yaml

@@ -0,0 +1,76 @@
+apiVersion: kops.k8s.io/v1alpha2
+kind: Cluster
+metadata:
+  creationTimestamp: "2017-01-01T00:00:00Z"
+  name: minimal.example.com
+spec:
+  api:
+    loadBalancer:
+      class: Network
+      type: Public
+  authorization:
+    rbac: {}
+  channel: stable
+  cloudProvider: aws
+  configBase: memfs://tests/minimal.example.com
+  etcdClusters:
+  - cpuRequest: 200m
+    etcdMembers:
+    - encryptedVolume: true
+      instanceGroup: control-plane-us-test-1a
+      name: a
+    manager:
+      backupRetentionDays: 90
+    memoryRequest: 100Mi
+    name: main
+  - cpuRequest: 100m
+    etcdMembers:
+    - encryptedVolume: true
+      instanceGroup: control-plane-us-test-1a
+      name: a
+    manager:
+      backupRetentionDays: 90
+    memoryRequest: 100Mi
+    name: events
+  iam:
+    allowContainerRegistry: true
+    legacy: false
+  kubelet:
+    anonymousAuth: false
+  kubernetesApiAccess:
+  - 0.0.0.0/0
+  - ::/0
+  kubernetesVersion: v1.32.0
+  networkCIDR: 172.20.0.0/16
+  networking:
+    cni: {}
+  nonMasqueradeCIDR: 100.64.0.0/10
+  sshAccess:
+  - 0.0.0.0/0
+  - ::/0
+  subnets:
+  - cidr: 172.20.0.0/16
+    name: us-test-1a
+    type: Public
+    zone: us-test-1a
+  topology:
+    dns:
+      type: None
+
+---
+
+apiVersion: kops.k8s.io/v1alpha2
+kind: InstanceGroup
+metadata:
+  creationTimestamp: "2017-01-01T00:00:00Z"
+  labels:
+    kops.k8s.io/cluster: minimal.example.com
+  name: control-plane-us-test-1a
+spec:
+  image: 099720109477/ubuntu/images/hvm-ssd-gp3/ubuntu-noble-24.04-amd64-server-20250610
+  machineType: m3.medium
+  maxSize: 1
+  minSize: 1
+  role: Master
+  subnets:
+  - us-test-1a

tests/integration/create_cluster/zero-nodes/options.yaml

@@ -0,0 +1,7 @@
+ClusterName: minimal.example.com
+Zones:
+- us-test-1a
+CloudProvider: aws
+Networking: cni
+KubernetesVersion: v1.32.0
+NodeCount: 0