Add e2e test

Signed-off-by: jorturfer <jorge_turrado@hotmail.es>

tests/scalers/kubernetes-workload.test.ts

@@ -0,0 +1,135 @@
+import * as fs from 'fs'
+import * as sh from 'shelljs'
+import * as tmp from 'tmp'
+import test from 'ava'
+import {waitForDeploymentReplicaCount} from "./helpers";
+
+const testNamespace = 'kubernetes-workload-test'
+const monitoredDeploymentFile = tmp.fileSync()
+const sutDeploymentFile = tmp.fileSync()
+
+test.before(t => {
+  sh.config.silent = true
+	sh.exec(`kubectl create namespace ${testNamespace}`)
+
+  fs.writeFileSync(monitoredDeploymentFile.name, monitoredDeploymentYaml)
+	t.is(
+		0,
+		sh.exec(`kubectl apply -f ${monitoredDeploymentFile.name} --namespace ${testNamespace}`).code,
+		'Deploying monitored deployment should work.'
+	)
+
+  fs.writeFileSync(sutDeploymentFile.name, sutDeploymentYaml)
+	t.is(
+		0,
+		sh.exec(`kubectl apply -f ${sutDeploymentFile.name} --namespace ${testNamespace}`).code,
+		'Deploying monitored deployment should work.'
+	)
+})
+
+test.serial('Deployment should have 1 replicas on start', t => {
+  const replicaCount = sh.exec(
+    `kubectl get deployment.apps/sut-deployment --namespace ${testNamespace} -o jsonpath="{.spec.replicas}"`
+  ).stdout
+  t.is(replicaCount, '1', 'replica count should start out as 1')
+})
+
+test.serial(`Deployment should scale to fit the amount of pods which match the selector`, async t => {
+
+  sh.exec(
+    `kubectl scale deployment.apps/monitored-deployment --namespace ${testNamespace} --replicas=5`
+  )
+  t.true(await waitForDeploymentReplicaCount(5, 'sut-deployment', testNamespace, 6, 10000), 'Replica count should be 5 after 60 seconds')
+
+  sh.exec(
+    `kubectl scale deployment.apps/monitored-deployment --namespace ${testNamespace} --replicas=10`
+  )
+  t.true(await waitForDeploymentReplicaCount(10, 'sut-deployment', testNamespace, 6, 10000), 'Replica count should be 10 after 60 seconds')
+
+  sh.exec(
+    `kubectl scale deployment.apps/monitored-deployment --namespace ${testNamespace} --replicas=5`
+  )
+  t.true(await waitForDeploymentReplicaCount(5, 'sut-deployment', testNamespace, 6, 10000), 'Replica count should be 5 after 60 seconds')
+
+  sh.exec(
+    `kubectl scale deployment.apps/monitored-deployment --namespace ${testNamespace} --replicas=1`
+  )
+  t.true(await waitForDeploymentReplicaCount(1, 'sut-deployment', testNamespace, 6, 10000), 'Replica count should be 1 after 60 seconds')
+})
+
+test.after.always.cb('clean up workload test related deployments', t => {
+  const resources = [
+    'scaledobject.keda.sh/sut-scaledobject',    
+    'deployment.apps/sut-deployment',
+    'deployment.apps/monitored-deployment',
+  ]
+
+  for (const resource of resources) {
+    sh.exec(`kubectl delete ${resource} --namespace ${testNamespace}`)
+  }
+  sh.exec(`kubectl delete namespace ${testNamespace}`)  
+  t.end()
+})
+
+const monitoredDeploymentYaml = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: monitored-deployment
+  labels:
+    deploy: workload-test
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      pod: workload-test
+  template:
+    metadata:
+      labels:
+        pod: workload-test
+    spec:
+      containers:
+        - name: nginx
+          image: 'nginx'`
+
+const sutDeploymentYaml = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: sut-deployment
+  labels:
+    deploy: workload-sut
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      pod: workload-sut
+  template:
+    metadata:
+      labels:
+        pod: workload-sut
+    spec:
+      containers:
+        - name: nginx
+          image: 'nginx'
+---
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: sut-scaledobject
+spec:
+  scaleTargetRef:
+    name: sut-deployment
+  pollingInterval: 5
+  cooldownPeriod: 5
+  minReplicaCount: 1
+  maxReplicaCount: 10
+  advanced:                        
+    horizontalPodAutoscalerConfig: 
+      behavior:                    
+        scaleDown:
+          stabilizationWindowSeconds: 15
+  triggers:
+  - type: kubernetes-workload
+    metadata:      
+      podSelector: 'pod=workload-test'
+      namespace: ${testNamespace}
+      value: '1'`