ci: add unit test for networkfencing util

Signed-off-by: Yug Gupta <yuggupta27@gmail.com>

internal/csi-addons/networkfence/fencing_test.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2022 The Ceph-CSI 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 networkfence
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetIPRange(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		cidr        string
+		expectedIPs []string
+	}{
+		{
+			cidr:        "192.168.1.0/31",
+			expectedIPs: []string{"192.168.1.0", "192.168.1.1"},
+		},
+		{
+			cidr:        "10.0.0.0/30",
+			expectedIPs: []string{"10.0.0.0", "10.0.0.1", "10.0.0.2", "10.0.0.3"},
+		},
+		{
+			cidr:        "fd4a:ecbc:cafd:4e49::/127",
+			expectedIPs: []string{"fd4a:ecbc:cafd:4e49::", "fd4a:ecbc:cafd:4e49::1"},
+		},
+	}
+	for _, tt := range tests {
+		ts := tt
+		t.Run(ts.cidr, func(t *testing.T) {
+			t.Parallel()
+			got, err := getIPRange(ts.cidr)
+			assert.NoError(t, err)
+
+			// validate if number of IPs in the range is same as expected, if not, fail.
+			assert.ElementsMatch(t, ts.expectedIPs, got)
+		})
+	}
+}