add integration test to prevent new beta APIs from being enabled by default

test/integration/apiserver/no_new_betas_test.go

@@ -0,0 +1,96 @@
+/*
+Copyright 2022 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 apiserver
+
+import (
+	"strings"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestNoNewBetaAPIsByDefault(t *testing.T) {
+	// yes, this *is* a copy/paste from somewhere else.  We really do mean it when we say you shouldn't be modifying
+	// this list and this test was created to make it more painful.
+	// legacyBetaEnabledByDefaultResources is the list of beta resources we enable.  You may not add to this list
+	legacyBetaEnabledByDefaultResources := map[schema.GroupVersionResource]bool{
+		gvr("autoscaling", "v2beta1", "horizontalpodautoscalers"):                     true, // remove in 1.25
+		gvr("autoscaling", "v2beta2", "horizontalpodautoscalers"):                     true, // remove in 1.26
+		gvr("batch", "v1beta1", "jobtemplates"):                                       true, // remove in 1.25
+		gvr("batch", "v1beta1", "cronjobs"):                                           true, // remove in 1.25
+		gvr("discovery.k8s.io", "v1beta1", "endpointslices"):                          true, // remove in 1.25
+		gvr("events.k8s.io", "v1beta1", "events"):                                     true, // remove in 1.25
+		gvr("node.k8s.io", "v1beta1", "runtimeclasses"):                               true, // remove in 1.25
+		gvr("policy", "v1beta1", "poddisruptionbudgets"):                              true, // remove in 1.25
+		gvr("policy", "v1beta1", "podsecuritypolicies"):                               true, // remove in 1.25
+		gvr("storage.k8s.io", "v1beta1", "csinodes"):                                  true, // remove in 1.25
+		gvr("storage.k8s.io", "v1beta1", "csistoragecapacities"):                      true, // remove in 1.27
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta1", "flowschemas"):                 true, // remove in 1.26
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta1", "prioritylevelconfigurations"): true, // remove in 1.26
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta2", "flowschemas"):                 true, // remove in 1.29
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta2", "prioritylevelconfigurations"): true, // remove in 1.29
+	}
+
+	// legacyBetaResourcesWithoutStableEquivalents contains those groupresources that were enabled by default as beta
+	// before we changed that policy and do not have stable versions. These resources are allowed to have additional
+	// beta versions enabled by default.  Nothing new should be added here.  There are no future exceptions because there
+	// are no more beta resources enabled by default.
+	legacyBetaResourcesWithoutStableEquivalents := map[schema.GroupResource]bool{
+		gvr("storage.k8s.io", "v1beta1", "csistoragecapacities").GroupResource():                      true,
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta1", "flowschemas").GroupResource():                 true,
+		gvr("flowcontrol.apiserver.k8s.io", "v1beta1", "prioritylevelconfigurations").GroupResource(): true,
+	}
+
+	// if you found this because you want to create an integration test for your new beta API, the method you're looking for
+	// is this setupWithResources method and you need to pass the resource you want to enable into it.
+	_, kubeClient, closeFn := setupWithResources(t,
+		[]schema.GroupVersion{},
+		[]schema.GroupVersionResource{},
+	)
+	defer closeFn()
+
+	_, allResourceLists, err := kubeClient.Discovery().ServerGroupsAndResources()
+	if err != nil {
+		t.Error(err)
+	}
+
+	for _, currResourceList := range allResourceLists {
+		for _, currResource := range currResourceList.APIResources {
+			if !strings.Contains(currResource.Version, "beta") {
+				continue // skip non-beta apis
+			}
+			if strings.Contains(currResource.Name, "/") {
+				continue // skip subresources
+			}
+			enabledGVR := schema.GroupVersionResource{
+				Group:    currResource.Group,
+				Version:  currResource.Version,
+				Resource: currResource.Name,
+			}
+			if legacyBetaEnabledByDefaultResources[enabledGVR] {
+				continue
+			}
+			if legacyBetaResourcesWithoutStableEquivalents[enabledGVR.GroupResource()] {
+				continue
+			}
+
+			t.Errorf("%v is a new beta API.  New beta APIs may not be enabled by default.  "+
+				"See https://github.com/kubernetes/enhancements/blob/0ad0fc8269165ca300d05ca51c7ce190a79976a5/keps/sig-architecture/3136-beta-apis-off-by-default/README.md "+
+				"for more details.", enabledGVR)
+		}
+	}
+}