Increase bandwidth coverage (#727)

* Increase bandwidth coverage

* Cleanup

* Remove whitespaces

* Fix BandwidthSuggestGasLimit error message

---------

Co-authored-by: libotony <[email protected]>

cmd/thor/bandwidth/bandwidth_test.go

@@ -0,0 +1,65 @@
+// Copyright (c) 2024 The VeChainThor developers
+
+// Distributed under the GNU Lesser General Public License v3.0 software license, see the accompanying
+// file LICENSE or <https://www.gnu.org/licenses/lgpl-3.0.html>
+
+package bandwidth
+
+import (
+	"crypto/rand"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/vechain/thor/v2/block"
+	"github.com/vechain/thor/v2/thor"
+)
+
+func TestBandwidth(t *testing.T) {
+	bandwidth := Bandwidth{
+		value: 0,
+		lock:  sync.Mutex{},
+	}
+
+	val := bandwidth.Value()
+
+	assert.Equal(t, uint64(0), val)
+}
+
+func GetMockHeader(t *testing.T) *block.Header {
+	var sig [65]byte
+	rand.Read(sig[:])
+
+	block := new(block.Builder).Build().WithSignature(sig[:])
+	h := block.Header()
+	return h
+}
+
+func TestBandwithUpdate(t *testing.T) {
+	bandwidth := Bandwidth{
+		value: 0,
+		lock:  sync.Mutex{},
+	}
+
+	block := new(block.Builder).ParentID(thor.Bytes32{1}).Timestamp(1).GasLimit(100000).Beneficiary(thor.Address{1}).GasUsed(11234).TotalScore(1).StateRoot(thor.Bytes32{1}).ReceiptsRoot(thor.Bytes32{1}).Build()
+	header := block.Header()
+
+	bandwidth.Update(header, 1)
+	val := bandwidth.Value()
+
+	assert.Equal(t, uint64(11234000000000), val)
+}
+
+func TestBandwidthSuggestGasLimit(t *testing.T) {
+	bandwidth := Bandwidth{
+		value: 0,
+		lock:  sync.Mutex{},
+	}
+
+	block := new(block.Builder).ParentID(thor.Bytes32{1}).Timestamp(1).GasLimit(100000).Beneficiary(thor.Address{1}).GasUsed(11234).TotalScore(1).StateRoot(thor.Bytes32{1}).ReceiptsRoot(thor.Bytes32{1}).Build()
+	header := block.Header()
+	bandwidth.Update(header, 1)
+	val := bandwidth.SuggestGasLimit()
+
+	assert.Equal(t, uint64(5617000000000), val)
+}