Add a fake client which can be used for webhook tests

Author: t-persson

internal/webhook/v1alpha2/fakeclient.go

@@ -0,0 +1,65 @@
+// Copyright Axis Communications AB.
+//
+// For a full list of individual contributors, please see the commit history.
+//
+// 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 v1alpha2
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// fakeReader implements the client.Reader interface
+type fakeReader struct {
+	getResponse  client.Object
+	listResponse client.ObjectList
+}
+
+// FakeReader returns a fake client implementing the client.Reader interface.
+//
+// Any of the two inputs can be nil, but it is best to at least provide one of them.
+// If an input is nil, the corresponding method will return an error.
+// The inputs are the resources you expect a webhook to fetch either using .Get or
+// .List.
+func FakeReader(get client.Object, list client.ObjectList) client.Reader {
+	return &fakeReader{get, list}
+}
+
+// Get fakes the get response of a controller-runtime client.
+func (f *fakeReader) Get(ctx context.Context, key client.ObjectKey, obj client.Object, opts ...client.GetOption) error {
+	if f.getResponse == nil {
+		return errors.New("this is an error in the Get method")
+	}
+	b, err := json.Marshal(f.getResponse)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(b, obj)
+}
+
+// List fakes the list response of a controller-runtime client.
+func (f *fakeReader) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error {
+	if f.listResponse == nil {
+		return errors.New("this is an error in the List method")
+	}
+	b, err := json.Marshal(f.listResponse)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(b, list)
+}