Merge pull request #51024 from fisherxu/UTautoscaler

Automatic merge from submit-queue (batch tested with PRs 51114, 51233, 51024, 51053, 51197)

add UT for pkg/apis/autoscaling/v2alpha1/defaults.go

**What this PR does / why we need it**:
add UT for pkg/apis/autoscaling/v2alpha1/defaults.go

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
None
```

hack/.golint_failures

@@ -107,7 +107,6 @@ pkg/apis/authorization/v1
 pkg/apis/authorization/v1beta1
 pkg/apis/authorization/validation
 pkg/apis/autoscaling
-pkg/apis/autoscaling/v2alpha1
 pkg/apis/autoscaling/validation
 pkg/apis/batch
 pkg/apis/batch/validation

pkg/apis/autoscaling/v2alpha1/BUILD

@@ -3,6 +3,7 @@ package(default_visibility = ["//visibility:public"])
 load(
     "@io_bazel_rules_go//go:def.bzl",
     "go_library",
+    "go_test",
 )
 
 go_library(
@@ -39,3 +40,19 @@ filegroup(
     srcs = [":package-srcs"],
     tags = ["automanaged"],
 )
+
+go_test(
+    name = "go_default_xtest",
+    srcs = ["defaults_test.go"],
+    deps = [
+        ":go_default_library",
+        "//pkg/api:go_default_library",
+        "//pkg/api/install:go_default_library",
+        "//pkg/apis/autoscaling:go_default_library",
+        "//pkg/apis/autoscaling/install:go_default_library",
+        "//vendor/k8s.io/api/autoscaling/v2alpha1:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
+    ],
+)

pkg/apis/autoscaling/v2alpha1/defaults_test.go

@@ -0,0 +1,131 @@
+/*
+Copyright 2017 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 v2alpha1_test
+
+import (
+	"reflect"
+	"testing"
+
+	autoscalingv2alpha1 "k8s.io/api/autoscaling/v2alpha1"
+	"k8s.io/api/core/v1"
+	apiequality "k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/kubernetes/pkg/api"
+	_ "k8s.io/kubernetes/pkg/api/install"
+	"k8s.io/kubernetes/pkg/apis/autoscaling"
+	_ "k8s.io/kubernetes/pkg/apis/autoscaling/install"
+	. "k8s.io/kubernetes/pkg/apis/autoscaling/v2alpha1"
+)
+
+func TestSetDefaultHPA(t *testing.T) {
+	utilizationDefaultVal := int32(autoscaling.DefaultCPUUtilization)
+	defaultReplicas := newInt32(1)
+	defaultTemplate := []autoscalingv2alpha1.MetricSpec{
+		{
+			Type: autoscalingv2alpha1.ResourceMetricSourceType,
+			Resource: &autoscalingv2alpha1.ResourceMetricSource{
+				Name: v1.ResourceCPU,
+				TargetAverageUtilization: &utilizationDefaultVal,
+			},
+		},
+	}
+
+	tests := []struct {
+		original *autoscalingv2alpha1.HorizontalPodAutoscaler
+		expected *autoscalingv2alpha1.HorizontalPodAutoscaler
+	}{
+		{ // MinReplicas default value
+			original: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					Metrics: defaultTemplate,
+				},
+			},
+			expected: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					MinReplicas: defaultReplicas,
+					Metrics:     defaultTemplate,
+				},
+			},
+		},
+		{ // MinReplicas update
+			original: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					MinReplicas: newInt32(3),
+					Metrics:     defaultTemplate,
+				},
+			},
+			expected: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					MinReplicas: newInt32(3),
+					Metrics:     defaultTemplate,
+				},
+			},
+		},
+		{ // Metrics default value
+			original: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					MinReplicas: defaultReplicas,
+				},
+			},
+			expected: &autoscalingv2alpha1.HorizontalPodAutoscaler{
+				Spec: autoscalingv2alpha1.HorizontalPodAutoscalerSpec{
+					MinReplicas: defaultReplicas,
+					Metrics:     defaultTemplate,
+				},
+			},
+		},
+	}
+
+	for i, test := range tests {
+		original := test.original
+		expected := test.expected
+		obj2 := roundTrip(t, runtime.Object(original))
+		got, ok := obj2.(*autoscalingv2alpha1.HorizontalPodAutoscaler)
+		if !ok {
+			t.Fatalf("(%d) unexpected object: %v", i, obj2)
+		}
+		if !apiequality.Semantic.DeepEqual(got.Spec, expected.Spec) {
+			t.Errorf("(%d) got different than expected\ngot:\n\t%+v\nexpected:\n\t%+v", i, got.Spec, expected.Spec)
+		}
+	}
+}
+
+func roundTrip(t *testing.T, obj runtime.Object) runtime.Object {
+	data, err := runtime.Encode(api.Codecs.LegacyCodec(SchemeGroupVersion), obj)
+	if err != nil {
+		t.Errorf("%v\n %#v", err, obj)
+		return nil
+	}
+	obj2, err := runtime.Decode(api.Codecs.UniversalDecoder(), data)
+	if err != nil {
+		t.Errorf("%v\nData: %s\nSource: %#v", err, string(data), obj)
+		return nil
+	}
+	obj3 := reflect.New(reflect.TypeOf(obj).Elem()).Interface().(runtime.Object)
+	err = api.Scheme.Convert(obj2, obj3, nil)
+	if err != nil {
+		t.Errorf("%v\nSource: %#v", err, obj2)
+		return nil
+	}
+	return obj3
+}
+
+func newInt32(val int32) *int32 {
+	p := new(int32)
+	*p = val
+	return p
+}