op-service: add unit test cover address.go file (#11049)

op-service/eth/address_test.go

+package eth
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+func TestAddressAsLeftPaddedHash(t *testing.T) {
+	// Test cases with different addresses
+	testCases := []struct {
+		name   string
+		addr   common.Address
+		expect common.Hash
+	}{
+		{
+			name:   "empty address",
+			addr:   common.Address{},
+			expect: common.HexToHash("0x0000000000000000000000000000000000000000"),
+		},
+		{
+			name:   "simple address",
+			addr:   common.HexToAddress("0x1234567890AbCdEf1234567890AbCdEf"),
+			expect: common.HexToHash("0x000000000000000000000000000000001234567890abcdef1234567890abcdef"),
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			output := AddressAsLeftPaddedHash(tc.addr)
+			if output != tc.expect {
+				t.Fatalf("Expected output %v for test case %s, got %v", tc.expect, tc.name, output)
+			}
+		})
+	}
+}