minimum runnable
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/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"context"
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"fmt"
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"reflect"
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"testing"
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"time"
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apps "k8s.io/api/apps/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/diff"
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kubeinformers "k8s.io/client-go/informers"
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k8sfake "k8s.io/client-go/kubernetes/fake"
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core "k8s.io/client-go/testing"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/record"
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"k8s.io/klog/v2/ktesting"
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"k8s.io/utils/ptr"
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samplecontroller "gitea.t000-n.de/t.behrendt/authentik-kubernetes-operator/pkg/apis/samplecontroller/v1alpha1"
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"gitea.t000-n.de/t.behrendt/authentik-kubernetes-operator/pkg/generated/clientset/versioned/fake"
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informers "gitea.t000-n.de/t.behrendt/authentik-kubernetes-operator/pkg/generated/informers/externalversions"
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)
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var (
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alwaysReady = func() bool { return true }
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noResyncPeriodFunc = func() time.Duration { return 0 }
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)
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type fixture struct {
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t *testing.T
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client *fake.Clientset
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kubeclient *k8sfake.Clientset
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// Objects to put in the store.
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fooLister []*samplecontroller.Foo
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deploymentLister []*apps.Deployment
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// Actions expected to happen on the client.
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kubeactions []core.Action
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actions []core.Action
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// Objects from here preloaded into NewSimpleFake.
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kubeobjects []runtime.Object
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objects []runtime.Object
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}
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func newFixture(t *testing.T) *fixture {
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f := &fixture{}
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f.t = t
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f.objects = []runtime.Object{}
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f.kubeobjects = []runtime.Object{}
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return f
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}
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func newFoo(name string, replicas *int32) *samplecontroller.Foo {
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return &samplecontroller.Foo{
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TypeMeta: metav1.TypeMeta{APIVersion: samplecontroller.SchemeGroupVersion.String()},
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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Namespace: metav1.NamespaceDefault,
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},
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Spec: samplecontroller.FooSpec{
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DeploymentName: fmt.Sprintf("%s-deployment", name),
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Replicas: replicas,
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},
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}
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}
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func (f *fixture) newController(ctx context.Context) (*Controller, informers.SharedInformerFactory, kubeinformers.SharedInformerFactory) {
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f.client = fake.NewClientset(f.objects...)
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f.kubeclient = k8sfake.NewClientset(f.kubeobjects...)
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i := informers.NewSharedInformerFactory(f.client, noResyncPeriodFunc())
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k8sI := kubeinformers.NewSharedInformerFactory(f.kubeclient, noResyncPeriodFunc())
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c := NewController(ctx, f.kubeclient, f.client,
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k8sI.Apps().V1().Deployments(), i.Samplecontroller().V1alpha1().Foos())
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c.foosSynced = alwaysReady
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c.deploymentsSynced = alwaysReady
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c.recorder = &record.FakeRecorder{}
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for _, f := range f.fooLister {
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i.Samplecontroller().V1alpha1().Foos().Informer().GetIndexer().Add(f)
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}
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for _, d := range f.deploymentLister {
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k8sI.Apps().V1().Deployments().Informer().GetIndexer().Add(d)
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}
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return c, i, k8sI
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}
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func (f *fixture) run(ctx context.Context, fooRef cache.ObjectName) {
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f.runController(ctx, fooRef, true, false)
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}
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func (f *fixture) runExpectError(ctx context.Context, fooRef cache.ObjectName) {
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f.runController(ctx, fooRef, true, true)
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}
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func (f *fixture) runController(ctx context.Context, fooRef cache.ObjectName, startInformers bool, expectError bool) {
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c, i, k8sI := f.newController(ctx)
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if startInformers {
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i.Start(ctx.Done())
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k8sI.Start(ctx.Done())
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}
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err := c.syncHandler(ctx, fooRef)
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if !expectError && err != nil {
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f.t.Errorf("error syncing foo: %v", err)
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} else if expectError && err == nil {
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f.t.Error("expected error syncing foo, got nil")
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}
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actions := filterInformerActions(f.client.Actions())
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for i, action := range actions {
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if len(f.actions) < i+1 {
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f.t.Errorf("%d unexpected actions: %+v", len(actions)-len(f.actions), actions[i:])
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break
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}
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expectedAction := f.actions[i]
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checkAction(expectedAction, action, f.t)
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}
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if len(f.actions) > len(actions) {
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f.t.Errorf("%d additional expected actions:%+v", len(f.actions)-len(actions), f.actions[len(actions):])
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}
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k8sActions := filterInformerActions(f.kubeclient.Actions())
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for i, action := range k8sActions {
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if len(f.kubeactions) < i+1 {
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f.t.Errorf("%d unexpected actions: %+v", len(k8sActions)-len(f.kubeactions), k8sActions[i:])
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break
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}
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expectedAction := f.kubeactions[i]
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checkAction(expectedAction, action, f.t)
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}
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if len(f.kubeactions) > len(k8sActions) {
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f.t.Errorf("%d additional expected actions:%+v", len(f.kubeactions)-len(k8sActions), f.kubeactions[len(k8sActions):])
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}
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}
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// checkAction verifies that expected and actual actions are equal and both have
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// same attached resources
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func checkAction(expected, actual core.Action, t *testing.T) {
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if !(expected.Matches(actual.GetVerb(), actual.GetResource().Resource) && actual.GetSubresource() == expected.GetSubresource()) {
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t.Errorf("Expected\n\t%#v\ngot\n\t%#v", expected, actual)
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return
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}
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if reflect.TypeOf(actual) != reflect.TypeOf(expected) {
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t.Errorf("Action has wrong type. Expected: %t. Got: %t", expected, actual)
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return
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}
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switch a := actual.(type) {
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case core.CreateActionImpl:
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e, _ := expected.(core.CreateActionImpl)
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expObject := e.GetObject()
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object := a.GetObject()
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if !reflect.DeepEqual(expObject, object) {
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t.Errorf("Action %s %s has wrong object\nDiff:\n %s",
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a.GetVerb(), a.GetResource().Resource, diff.ObjectGoPrintSideBySide(expObject, object))
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}
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case core.UpdateActionImpl:
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e, _ := expected.(core.UpdateActionImpl)
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expObject := e.GetObject()
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object := a.GetObject()
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if !reflect.DeepEqual(expObject, object) {
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t.Errorf("Action %s %s has wrong object\nDiff:\n %s",
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a.GetVerb(), a.GetResource().Resource, diff.ObjectGoPrintSideBySide(expObject, object))
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}
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case core.PatchActionImpl:
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e, _ := expected.(core.PatchActionImpl)
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expPatch := e.GetPatch()
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patch := a.GetPatch()
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if !reflect.DeepEqual(expPatch, patch) {
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t.Errorf("Action %s %s has wrong patch\nDiff:\n %s",
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a.GetVerb(), a.GetResource().Resource, diff.ObjectGoPrintSideBySide(expPatch, patch))
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}
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default:
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t.Errorf("Uncaptured Action %s %s, you should explicitly add a case to capture it",
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actual.GetVerb(), actual.GetResource().Resource)
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}
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}
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// filterInformerActions filters list and watch actions for testing resources.
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// Since list and watch don't change resource state we can filter it to lower
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// nose level in our tests.
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func filterInformerActions(actions []core.Action) []core.Action {
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ret := []core.Action{}
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for _, action := range actions {
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if len(action.GetNamespace()) == 0 &&
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(action.Matches("list", "foos") ||
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action.Matches("watch", "foos") ||
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action.Matches("list", "deployments") ||
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action.Matches("watch", "deployments")) {
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continue
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}
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ret = append(ret, action)
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}
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return ret
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}
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func (f *fixture) expectCreateDeploymentAction(d *apps.Deployment) {
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f.kubeactions = append(f.kubeactions, core.NewCreateAction(schema.GroupVersionResource{Resource: "deployments"}, d.Namespace, d))
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}
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func (f *fixture) expectUpdateDeploymentAction(d *apps.Deployment) {
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f.kubeactions = append(f.kubeactions, core.NewUpdateAction(schema.GroupVersionResource{Resource: "deployments"}, d.Namespace, d))
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}
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func (f *fixture) expectUpdateFooStatusAction(foo *samplecontroller.Foo) {
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action := core.NewUpdateSubresourceAction(schema.GroupVersionResource{Resource: "foos"}, "status", foo.Namespace, foo)
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f.actions = append(f.actions, action)
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}
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func getRef(foo *samplecontroller.Foo, t *testing.T) cache.ObjectName {
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ref := cache.MetaObjectToName(foo)
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return ref
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}
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func TestCreatesDeployment(t *testing.T) {
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f := newFixture(t)
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foo := newFoo("test", ptr.To[int32](1))
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_, ctx := ktesting.NewTestContext(t)
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f.fooLister = append(f.fooLister, foo)
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f.objects = append(f.objects, foo)
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expDeployment := newDeployment(foo)
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f.expectCreateDeploymentAction(expDeployment)
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f.expectUpdateFooStatusAction(foo)
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f.run(ctx, getRef(foo, t))
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}
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func TestDoNothing(t *testing.T) {
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f := newFixture(t)
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foo := newFoo("test", ptr.To[int32](1))
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_, ctx := ktesting.NewTestContext(t)
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d := newDeployment(foo)
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f.fooLister = append(f.fooLister, foo)
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f.objects = append(f.objects, foo)
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f.deploymentLister = append(f.deploymentLister, d)
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f.kubeobjects = append(f.kubeobjects, d)
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f.expectUpdateFooStatusAction(foo)
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f.run(ctx, getRef(foo, t))
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}
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func TestUpdateDeployment(t *testing.T) {
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f := newFixture(t)
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foo := newFoo("test", ptr.To[int32](1))
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_, ctx := ktesting.NewTestContext(t)
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d := newDeployment(foo)
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// Update replicas
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foo.Spec.Replicas = ptr.To[int32](2)
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expDeployment := newDeployment(foo)
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f.fooLister = append(f.fooLister, foo)
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f.objects = append(f.objects, foo)
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f.deploymentLister = append(f.deploymentLister, d)
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f.kubeobjects = append(f.kubeobjects, d)
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f.expectUpdateFooStatusAction(foo)
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f.expectUpdateDeploymentAction(expDeployment)
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f.run(ctx, getRef(foo, t))
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}
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func TestNotControlledByUs(t *testing.T) {
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f := newFixture(t)
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foo := newFoo("test", ptr.To[int32](1))
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_, ctx := ktesting.NewTestContext(t)
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d := newDeployment(foo)
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d.ObjectMeta.OwnerReferences = []metav1.OwnerReference{}
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f.fooLister = append(f.fooLister, foo)
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f.objects = append(f.objects, foo)
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f.deploymentLister = append(f.deploymentLister, d)
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f.kubeobjects = append(f.kubeobjects, d)
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f.runExpectError(ctx, getRef(foo, t))
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}
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