Merge pull request #65291 from misterikkit/fake-client

Automatic merge from submit-queue (batch tested with PRs 65301, 65291, 65307, 63845, 65313). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add client-go example using fake client in test. **What this PR does / why we need it**: This adds an example showing the steps needed to get a working SharedInformerFactory with a fake client for testing. **Special notes for your reviewer**: I had a really hard time figuring out how to use this utility correctly. I don't think this example is sufficient documentation, but it's a good start. **Release note**: ```release-note NONE ``` /sig api-machinery /kind documentation Kubernetes-commit: 8008c7dad945f7ac0748774a99148c864932288e
2025-07-05 19:26:23 +00:00 · 2018-06-22 03:08:10 -07:00 · 2018-06-22 03:08:10 -07:00 · 8d892d34b2
commit 8d892d34b2
parent 2a94c229c0 c72a3893b1
4 changed files with 176 additions and 81 deletions
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@ -1,6 +1,6 @@
 {
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 	"Packages": [
 		"./..."
@ -268,323 +268,323 @@
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 			"ImportPath": "k8s.io/apimachinery/pkg/version",
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+			"Rev": "e622339dc5f39d70f000c70867b4dd20435d48ff"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/watch",
-			"Rev": "954ae1c14eaec8ab19f63260d42de50e9ecc9961"
+			"Rev": "e622339dc5f39d70f000c70867b4dd20435d48ff"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/json",
-			"Rev": "954ae1c14eaec8ab19f63260d42de50e9ecc9961"
+			"Rev": "e622339dc5f39d70f000c70867b4dd20435d48ff"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/netutil",
-			"Rev": "954ae1c14eaec8ab19f63260d42de50e9ecc9961"
+			"Rev": "e622339dc5f39d70f000c70867b4dd20435d48ff"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/reflect",
-			"Rev": "954ae1c14eaec8ab19f63260d42de50e9ecc9961"
+			"Rev": "e622339dc5f39d70f000c70867b4dd20435d48ff"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/util/proto",
--- a/examples/README.md
+++ b/examples/README.md
@ -25,3 +25,7 @@ for client-go.
  the custom resources.

 [informer]: https://godoc.org/k8s.io/client-go/tools/cache#NewInformer
+
+### Testing
+
+- [**Fake Client**](./fake-client): Use a fake client in tests.
--- a/examples/fake-client/README.md
+++ b/examples/fake-client/README.md
@ -0,0 +1,14 @@
+# Fake Client Example
+
+This example demonstrates how to use a fake client with SharedInformerFactory in tests.
+
+It covers:
+ * Creating the fake client
+ * Setting up real informers
+ * Injecting events into those informers
+
+## Running
+
+```
+go test -v k8s.io/client-go/examples/fake-client
+```
--- a/examples/fake-client/main_test.go
+++ b/examples/fake-client/main_test.go
@ -0,0 +1,77 @@
+/*
+Copyright 2018 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 fakeclient
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes/fake"
+	"k8s.io/client-go/tools/cache"
+)
+
+// TestFakeClient demonstrates how to use a fake client with SharedInformerFactory in tests.
+func TestFakeClient(t *testing.T) {
+	// Use a timeout to keep the test from hanging.
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+
+	// Create the fake client.
+	client := fake.NewSimpleClientset()
+
+	// We will create an informer that writes added pods to a channel.
+	pods := make(chan *v1.Pod, 1)
+	informers := informers.NewSharedInformerFactory(client, 0)
+	podInformer := informers.Core().V1().Pods().Informer()
+	podInformer.AddEventHandler(&cache.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			pod := obj.(*v1.Pod)
+			t.Logf("pod added: %s/%s", pod.Namespace, pod.Name)
+			pods <- pod
+			cancel()
+		},
+	})
+
+	// Make sure informers are running.
+	informers.Start(ctx.Done())
+
+	// This is not required in tests, but it serves as a proof-of-concept by
+	// ensuring that the informer goroutine have warmed up and called List before
+	// we send any events to it.
+	for !podInformer.HasSynced() {
+		time.Sleep(10 * time.Millisecond)
+	}
+
+	// Inject an event into the fake client.
+	p := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "my-pod"}}
+	_, err := client.Core().Pods("test-ns").Create(p)
+	if err != nil {
+		t.Errorf("error injecting pod add: %v", err)
+	}
+
+	// Wait and check result.
+	<-ctx.Done()
+	select {
+	case pod := <-pods:
+		t.Logf("Got pod from channel: %s/%s", pod.Namespace, pod.Name)
+	default:
+		t.Error("Informer did not get the added pod")
+	}
+}