diff --git a/internal/csi-addons/networkfence/fencing_test.go b/internal/csi-addons/networkfence/fencing_test.go
index bbe82120d070..c0994714fae5 100644
--- a/internal/csi-addons/networkfence/fencing_test.go
+++ b/internal/csi-addons/networkfence/fencing_test.go
@@ -132,3 +132,40 @@ func TestFetchID(t *testing.T) {
 		})
 	}
 }
+
+func TestFetchIPfromEntry(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		entry       string
+		expectedIP  string
+		expectedErr bool
+	}{
+		{
+			entry:       "127.0.0.1:0/3710147553 2018-03-19 11:32:24.716146",
+			expectedIP:  "127.0.0.1",
+			expectedErr: false,
+		},
+		{
+			entry:       "",
+			expectedIP:  "",
+			expectedErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		ts := tt
+		t.Run(ts.entry, func(t *testing.T) {
+			t.Parallel()
+			ip, actualErr := fetchIPfromEntry(ts.entry)
+
+			if (actualErr != nil) != ts.expectedErr {
+				t.Errorf("expected error %v but got %v", ts.expectedErr, actualErr)
+			}
+
+			if ip != ts.expectedIP {
+				t.Errorf("expected IP %s but got %s", ts.expectedIP, ip)
+			}
+		})
+	}
+}