pkg/utils/hwaddr: migrate code from IPAM pkg

pkg/utils/hwaddr/hwaddr_test.go

@@ -0,0 +1,70 @@
+// Copyright 2016 CNI 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 hwaddr_test
+
+import (
+	"net"
+
+	"github.com/containernetworking/cni/pkg/utils/hwaddr"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Hwaddr", func() {
+	Context("Generate Hardware Address", func() {
+		It("generate hardware address based on ipv4 address", func() {
+			testCases := []struct {
+				ip          net.IP
+				expectedMAC string
+			}{
+				{
+					ip:          net.ParseIP("10.0.0.2"),
+					expectedMAC: hwaddr.PrivateMACPrefix + ":0a:00:00:02",
+				},
+				{
+					ip:          net.ParseIP("10.250.0.244"),
+					expectedMAC: hwaddr.PrivateMACPrefix + ":0a:fa:00:f4",
+				},
+				{
+					ip:          net.ParseIP("172.17.0.2"),
+					expectedMAC: hwaddr.PrivateMACPrefix + ":ac:11:00:02",
+				},
+			}
+
+			for _, tc := range testCases {
+				mac, err := hwaddr.GenerateHardwareAddr4(tc.ip, hwaddr.PrivateMACPrefix)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(mac.String()).To(Equal(tc.expectedMAC))
+			}
+		})
+
+		It("return error if input is not ipv4 address", func() {
+			testCases := []net.IP{
+				net.ParseIP(""),
+				net.ParseIP("2001:db8:0:1:1:1:1:1"),
+			}
+			for _, tc := range testCases {
+				_, err := hwaddr.GenerateHardwareAddr4(tc, hwaddr.PrivateMACPrefix)
+				Expect(err).To(BeAssignableToTypeOf(hwaddr.SupportIp4OnlyErr{}))
+			}
+		})
+
+		It("return error if prefix is invalid", func() {
+			_, err := hwaddr.GenerateHardwareAddr4(net.ParseIP("10.0.0.2"), "")
+			Expect(err).To(BeAssignableToTypeOf(hwaddr.InvalidPrefixLengthErr{}))
+		})
+	})
+})