add e2e test for eagerScalingStrategy

Signed-off-by: June Han <sorrowitsch@gmail.com>

tests/internals/scaling_strategies/eager_scaling_strategy_test.go

@@ -0,0 +1,116 @@
+//go:build e2e
+// +build e2e
+
+package eager_scaling_strategy_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/joho/godotenv"
+	"github.com/stretchr/testify/assert"
+	"k8s.io/client-go/kubernetes"
+
+	. "github.com/kedacore/keda/v2/tests/helper" // For helper methods
+	. "github.com/kedacore/keda/v2/tests/scalers/rabbitmq"
+)
+
+var _ = godotenv.Load("../../.env") // For loading env variables from .env
+
+const (
+	testName = "eager-scaling-strategy-test"
+)
+
+var (
+	testNamespace    = fmt.Sprintf("%s-ns", testName)
+	rmqNamespace     = fmt.Sprintf("%s-rmq", testName)
+	scaledJobName    = fmt.Sprintf("%s-sj", testName)
+	queueName        = "hello"
+	user             = fmt.Sprintf("%s-user", testName)
+	password         = fmt.Sprintf("%s-password", testName)
+	vhost            = "/"
+	connectionString = fmt.Sprintf("amqp://%s:%s@rabbitmq.%s.svc.cluster.local", user, password, rmqNamespace)
+)
+
+// YAML templates for your Kubernetes resources
+const (
+	scaledJobTemplate = `
+apiVersion: keda.sh/v1alpha1
+kind: ScaledJob
+metadata:
+  name: {{.ScaledJobName}}
+  namespace: {{.TestNamespace}}
+  labels:
+    app: {{.ScaledJobName}}
+spec:
+  jobTargetRef:
+    template:
+      spec:
+        containers:
+          - name: sleeper
+            image: busybox
+            command:
+            - sleep
+            - "300"
+            imagePullPolicy: IfNotPresent
+        restartPolicy: Never
+    backoffLimit: 1
+  pollingInterval: 5
+  maxReplicaCount: 10
+  scalingStrategy:
+    strategy: "eager"
+  triggers:
+    - type: rabbitmq
+      metadata:
+        queueName: {{.QueueName}}
+        hostFromEnv: RabbitApiHost
+        mode: QueueLength
+        value: '1'
+`
+)
+
+type templateData struct {
+	ScaledJobName string
+	TestNamespace string
+	QueueName     string
+}
+
+func TestScalingStrategy(t *testing.T) {
+	kc := GetKubernetesClient(t)
+	data, templates := getTemplateData()
+	t.Cleanup(func() {
+		DeleteKubernetesResources(t, testNamespace, data, templates)
+		RMQUninstall(t, rmqNamespace, user, password, vhost, WithoutOAuth())
+	})
+
+	RMQInstall(t, kc, rmqNamespace, user, password, vhost, WithoutOAuth())
+	CreateKubernetesResources(t, kc, testNamespace, data, templates)
+
+	testEagerScaling(t, kc)
+}
+
+func getTemplateData() (templateData, []Template) {
+	return templateData{
+			// Populate fields required in YAML templates
+			ScaledJobName: scaledJobName,
+			TestNamespace: testNamespace,
+			QueueName:     queueName,
+		}, []Template{
+			{Name: "scaledJobTemplate", Config: scaledJobTemplate},
+		}
+}
+
+func testEagerScaling(t *testing.T, kc *kubernetes.Clientset) {
+	iterationCount := 20
+	RMQPublishMessages(t, rmqNamespace, connectionString, queueName, 4)
+	assert.True(t, WaitForScaledJobCount(t, kc, scaledJobName, testNamespace, 4, iterationCount, 1),
+		"job count should be %d after %d iterations", 4, iterationCount)
+
+	RMQPublishMessages(t, rmqNamespace, connectionString, queueName, 4)
+	assert.True(t, WaitForScaledJobCount(t, kc, scaledJobName, testNamespace, 8, iterationCount, 1),
+		"job count should be %d after %d iterations", 8, iterationCount)
+
+	RMQPublishMessages(t, rmqNamespace, connectionString, queueName, 4)
+	assert.True(t, WaitForScaledJobCount(t, kc, scaledJobName, testNamespace, 10, iterationCount, 1),
+		"job count should be %d after %d iterations", 10, iterationCount)
+}