DRA: bump API v1alpha2 -> v1alpha3

This is in preparation for revamping the resource.k8s.io completely. Because
there will be no support for transitioning from v1alpha2 to v1alpha3, the
roundtrip test data for that API in 1.29 and 1.30 gets removed.

Repeating the version in the import name of the API packages is not really
required. It was done for a while to support simpler grepping for usage of
alpha APIs, but there are better ways for that now. So during this transition,
"resourceapi" gets used instead of "resourcev1alpha3" and the version gets
dropped from informer and lister imports. The advantage is that the next bump
to v1beta1 will affect fewer source code lines.

Only source code where the version really matters (like API registration)
retains the versioned import.

pkg/apis/resource/v1alpha3/defaults_test.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2022 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 v1alpha3_test
+
+import (
+	"reflect"
+	"testing"
+
+	v1alpha3 "k8s.io/api/resource/v1alpha3"
+	"k8s.io/apimachinery/pkg/runtime"
+
+	// ensure types are installed
+	"k8s.io/kubernetes/pkg/api/legacyscheme"
+	_ "k8s.io/kubernetes/pkg/apis/resource/install"
+)
+
+func TestSetDefaultAllocationMode(t *testing.T) {
+	claim := &v1alpha3.ResourceClaim{}
+
+	// field should be defaulted
+	defaultMode := v1alpha3.AllocationModeWaitForFirstConsumer
+	output := roundTrip(t, runtime.Object(claim)).(*v1alpha3.ResourceClaim)
+	outMode := output.Spec.AllocationMode
+	if outMode != defaultMode {
+		t.Errorf("Expected AllocationMode to be defaulted to: %+v, got: %+v", defaultMode, outMode)
+	}
+
+	// field should not change
+	nonDefaultMode := v1alpha3.AllocationModeImmediate
+	claim = &v1alpha3.ResourceClaim{
+		Spec: v1alpha3.ResourceClaimSpec{
+			AllocationMode: nonDefaultMode,
+		},
+	}
+	output = roundTrip(t, runtime.Object(claim)).(*v1alpha3.ResourceClaim)
+	outMode = output.Spec.AllocationMode
+	if outMode != v1alpha3.AllocationModeImmediate {
+		t.Errorf("Expected AllocationMode to remain %+v, got: %+v", nonDefaultMode, outMode)
+	}
+}
+
+func roundTrip(t *testing.T, obj runtime.Object) runtime.Object {
+	codec := legacyscheme.Codecs.LegacyCodec(v1alpha3.SchemeGroupVersion)
+	data, err := runtime.Encode(codec, obj)
+	if err != nil {
+		t.Errorf("%v\n %#v", err, obj)
+		return nil
+	}
+	obj2, err := runtime.Decode(codec, 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 = legacyscheme.Scheme.Convert(obj2, obj3, nil)
+	if err != nil {
+		t.Errorf("%v\nSource: %#v", err, obj2)
+		return nil
+	}
+	return obj3
+}