add swarm Address tests

pkg/swarm/swarm_test.go

+// Copyright 2020 The Swarm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package swarm_test
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"testing"
+
+	"github.com/ethersphere/bee/pkg/swarm"
+)
+
+func TestAddress(t *testing.T) {
+	for _, tc := range []struct {
+		name    string
+		hex     string
+		want    swarm.Address
+		wantErr error
+	}{
+		{
+			name: "blank",
+			hex:  "",
+			want: swarm.ZeroAddress,
+		},
+		{
+			name:    "odd",
+			hex:     "0",
+			wantErr: hex.ErrLength,
+		},
+		{
+			name: "zero",
+			hex:  "00",
+			want: []byte{0},
+		},
+		{
+			name: "one",
+			hex:  "01",
+			want: []byte{1},
+		},
+		{
+			name: "arbitrary",
+			hex:  "35a26b7bb6455cbabe7a0e05aafbd0b8b26feac843e3b9a649468d0ea37a12b2",
+			want: []byte{0x35, 0xa2, 0x6b, 0x7b, 0xb6, 0x45, 0x5c, 0xba, 0xbe, 0x7a, 0xe, 0x5, 0xaa, 0xfb, 0xd0, 0xb8, 0xb2, 0x6f, 0xea, 0xc8, 0x43, 0xe3, 0xb9, 0xa6, 0x49, 0x46, 0x8d, 0xe, 0xa3, 0x7a, 0x12, 0xb2},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			a, err := swarm.NewAddress(tc.hex)
+			if !errors.Is(err, tc.wantErr) {
+				t.Fatalf("got error %v, want %v", err, tc.wantErr)
+			}
+			if !bytes.Equal(a, tc.want) {
+				t.Errorf("got address %#v, want %#v", a, tc.want)
+			}
+			if !a.Equal(tc.want) {
+				t.Errorf("address %v not equal to %v", a, tc.want)
+			}
+			if a.IsZero() != tc.want.IsZero() {
+				t.Errorf("got address as zero=%v, want zero=%v", a.IsZero(), tc.want.IsZero())
+			}
+		})
+	}
+}