tests: add test for APIs not in internal version

pkg/apis/kops/install/install_test.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package install
+
+import (
+	"strings"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestTypesExistInAllVersions(t *testing.T) {
+	scheme := runtime.NewScheme()
+	Install(scheme)
+
+	group := "kops.k8s.io"
+	internalVersion := schema.GroupVersion{Group: group, Version: runtime.APIVersionInternal}
+	internalKindToGoType := scheme.KnownTypes(internalVersion)
+
+	internalKinds := make(map[string]bool)
+	for kind := range internalKindToGoType {
+		internalKinds[kind] = true
+	}
+
+	for _, version := range []string{"v1alpha2", "v1alpha3"} {
+		versionKinds := scheme.KnownTypes(schema.GroupVersion{Group: group, Version: version})
+		for kind := range versionKinds {
+			// Ignore ListOptions, DeleteOptions, etc.
+			if strings.HasSuffix(kind, "Options") {
+				continue
+			}
+			if !internalKinds[kind] {
+				t.Errorf("version %s has kind %s, not found in internal API", version, kind)
+			}
+		}
+	}
+}