test(vm): add userdata validation unit test

Signed-off-by: Roman Sysoev <roman.sysoev@flant.com>

Author: Roman Sysoev

images/virtualization-artifact/pkg/controller/service/provisioning_service.go

@@ -31,6 +31,11 @@ import (
 
 const cloudInitUserMaxLen = 2048
 
+var (
+	ErrUserDataEmpty   = errors.New("provisioning userdata is defined, but it is empty")
+	ErrUserDataTooLong = fmt.Errorf("userdata exceeds %d byte limit; should use userDataRef for larger data", cloudInitUserMaxLen)
+)
+
 type ProvisioningService struct {
 	reader client.Reader
 }
@@ -103,11 +108,11 @@ func (p *ProvisioningService) hasOneOfKeys(secret *corev1.Secret, checkKeys ...s
 
 func (p *ProvisioningService) ValidateUserDataLen(userData string) error {
 	if userData == "" {
-		return errors.New("provisioning userdata is defined, but it is empty")
+		return ErrUserDataEmpty
 	}
 
 	if len(userData) > cloudInitUserMaxLen {
-		return fmt.Errorf("userdata exceeds %d byte limit; should use userDataRef for larger data", cloudInitUserMaxLen)
+		return ErrUserDataTooLong
 	}
 
 	return nil

images/virtualization-artifact/pkg/controller/service/provisioning_service_test.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2026 Flant JSC
+
+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 service
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("ProvisioningService", func() {
+	var provisioningService *ProvisioningService
+
+	BeforeEach(func() {
+		provisioningService = NewProvisioningService(nil)
+	})
+
+	DescribeTable("ValidateUserDataLen",
+		func(userData string, expectedErr error) {
+			err := provisioningService.ValidateUserDataLen(userData)
+			if expectedErr != nil {
+				Expect(err).To(HaveOccurred())
+				Expect(err).To(MatchError(expectedErr))
+			} else {
+				Expect(err).ToNot(HaveOccurred())
+			}
+		},
+		Entry(
+			"empty userdata",
+			"",
+			ErrUserDataEmpty,
+		),
+		Entry(
+			"userdata exceeds max limit",
+			string(make([]byte, cloudInitUserMaxLen+1)),
+			ErrUserDataTooLong,
+		),
+		Entry(
+			"userdata is within limit",
+			string(make([]byte, cloudInitUserMaxLen-1)),
+			nil,
+		),
+	)
+})