From 7cf39c47c7b8345c01ff9e98c19c28c39de229ef Mon Sep 17 00:00:00 2001
From: Daniel Smith <dbsmith@google.com>
Date: Wed, 8 Apr 2015 13:43:51 -0700
Subject: [PATCH] add a test; coverage up to 84.7%

---
 pkg/controller/framework/controller_test.go | 102 +++++++++++++++++++-
 1 file changed, 101 insertions(+), 1 deletion(-)

diff --git a/pkg/controller/framework/controller_test.go b/pkg/controller/framework/controller_test.go
index 1f32aeb3c6d80..6fcfabaaa4748 100644
--- a/pkg/controller/framework/controller_test.go
+++ b/pkg/controller/framework/controller_test.go
@@ -18,15 +18,18 @@ package framework_test
 
 import (
 	"fmt"
+	"math/rand"
 	"sync"
+	"testing"
 	"time"
-	// "testing"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/cache"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/controller/framework"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+
+	"github.com/google/gofuzz"
 )
 
 func Example() {
@@ -170,3 +173,100 @@ func ExampleInformer() {
 	// b-controller
 	// c-framework
 }
+
+func TestHammerController(t *testing.T) {
+	// This test executes a bunch of requests through the fake source and
+	// controller framework to make sure there's no locking/threading
+	// errors.
+
+	// source simulates an apiserver object endpoint.
+	source := framework.NewFakeControllerSource()
+
+	// Let's do threadsafe output to get predictable test results.
+	outputSetLock := sync.Mutex{}
+	// map of key to operations done on the key
+	outputSet := map[string][]string{}
+
+	recordFunc := func(eventType string, obj interface{}) {
+		key, err := framework.DeletionHandlingMetaNamespaceKeyFunc(obj)
+		if err != nil {
+			t.Errorf("something wrong with key: %v", err)
+			key = "oops something went wrong with the key"
+		}
+
+		// Record some output when items are deleted.
+		outputSetLock.Lock()
+		defer outputSetLock.Unlock()
+		outputSet[key] = append(outputSet[key], eventType)
+	}
+
+	// Make a controller that immediately deletes anything added to it, and
+	// logs anything deleted.
+	_, controller := framework.NewInformer(
+		source,
+		&api.Pod{},
+		time.Millisecond*100,
+		framework.ResourceEventHandlerFuncs{
+			AddFunc:    func(obj interface{}) { recordFunc("add", obj) },
+			UpdateFunc: func(obj interface{}) { recordFunc("update", obj) },
+			DeleteFunc: func(obj interface{}) { recordFunc("delete", obj) },
+		},
+	)
+
+	// Run the controller and run it until we close stop.
+	stop := make(chan struct{})
+	go controller.Run(stop)
+
+	wg := sync.WaitGroup{}
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			// Let's add a few objects to the source.
+			currentNames := util.StringSet{}
+			rs := rand.NewSource(rand.Int63())
+			f := fuzz.New().NilChance(.5).NumElements(0, 2).RandSource(rs)
+			r := rand.New(rs) // Mustn't use r and f concurrently!
+			for i := 0; i < 750; i++ {
+				var name string
+				var isNew bool
+				if currentNames.Len() == 0 || r.Intn(3) == 1 {
+					f.Fuzz(&name)
+					isNew = true
+				} else {
+					l := currentNames.List()
+					name = l[r.Intn(len(l))]
+				}
+
+				pod := &api.Pod{}
+				f.Fuzz(pod)
+				pod.ObjectMeta.Name = name
+				pod.ObjectMeta.Namespace = "default"
+				// Add, update, or delete randomly.
+				// Note that these pods are not valid-- the fake source doesn't
+				// call validation or anything.
+				if isNew {
+					currentNames.Insert(name)
+					source.Add(pod)
+					continue
+				}
+				switch r.Intn(2) {
+				case 0:
+					currentNames.Insert(name)
+					source.Modify(pod)
+				case 1:
+					currentNames.Delete(name)
+					source.Delete(pod)
+				}
+			}
+		}()
+	}
+	wg.Wait()
+
+	// Let's wait for the controller to finish processing the things we just added.
+	time.Sleep(100 * time.Millisecond)
+	close(stop)
+
+	outputSetLock.Lock()
+	t.Logf("got: %#v", outputSet)
+}