add fake client wrapper for setting resource version

Author: fabriziopandini

util/patch/fake/client.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2020 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 fake
+
+import (
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+)
+
+// NewFakeClientWithScheme creates a new fake client with the given scheme
+// for testing.
+// You can choose to initialize it with a slice of runtime.Object; all the objects with be given
+// a fake ResourceVersion="1" so it will be possible to use optimistic lock when patching conditions.
+func NewFakeClientWithScheme(clientScheme *runtime.Scheme, initObjs ...runtime.Object) client.Client {
+	for _, obj := range initObjs {
+		accessor, err := meta.Accessor(obj)
+		if err != nil {
+			panic(fmt.Errorf("failed to get accessor for object: %v", err))
+		}
+
+		if accessor.GetResourceVersion() == "" {
+			accessor.SetResourceVersion("1")
+		}
+	}
+	return fake.NewFakeClientWithScheme(clientScheme, initObjs...)
+}