style: Use require.ErrorIs whenever possible

.avalanche-golangci.yml

@@ -104,12 +104,12 @@ linters:
     forbidigo:
       # Forbid the following identifiers (list of regexp).
       forbid:
-        # - pattern: require\.Error$(# ErrorIs should be used instead)?
-        # - pattern: require\.ErrorContains$(# ErrorIs should be used instead)?
-        # - pattern: require\.EqualValues$(# Equal should be used instead)?
-        # - pattern: require\.NotEqualValues$(# NotEqual should be used instead)?
+        - pattern: require\.Error$(# ErrorIs should be used instead)?
+        - pattern: require\.ErrorContains$(# ErrorIs should be used instead)?
+        - pattern: require\.EqualValues$(# Equal should be used instead)?
+        - pattern: require\.NotEqualValues$(# NotEqual should be used instead)?
         - pattern: ^(t|b|tb|f)\.(Fatal|Fatalf|Error|Errorf)$(# the require library should be used instead)?
-        # - pattern: ^sort\.(Slice|Strings)$(# the slices package should be used instead)?
+        - pattern: ^sort\.(Slice|Strings)$(# the slices package should be used instead)?
       # Exclude godoc examples from forbidigo checks.
       exclude-godoc-examples: false
     gosec:

accounts/abi/abi_extra_test.go

@@ -81,7 +81,7 @@ func TestUnpackInputIntoInterface(t *testing.T) {
 				err = abi.UnpackInputIntoInterface(&v, "receive", data, test.strictMode) // skips 4 byte selector
 
 				if test.expectedErrorSubstring != "" {
-					require.ErrorContains(t, err, test.expectedErrorSubstring)
+					require.ErrorContains(t, err, test.expectedErrorSubstring) //nolint:forbidigo // uses upstream code
 				} else {
 					require.NoError(t, err)
 					require.Equal(t, input, v)

network/network.go

@@ -35,6 +35,7 @@ const (
 
 var (
 	errAcquiringSemaphore                      = errors.New("error acquiring semaphore")
+	errEmptyNodeID                             = errors.New("cannot send request to empty nodeID")
 	errExpiredRequest                          = errors.New("expired request")
 	errNoPeersFound                            = errors.New("no peers found matching version")
 	_                     Network              = (*network)(nil)
@@ -187,7 +188,7 @@ func (n *network) SendAppRequestAny(ctx context.Context, minVersion *version.App
 // SendAppRequest sends request message bytes to specified nodeID, notifying the responseHandler on response or failure
 func (n *network) SendAppRequest(ctx context.Context, nodeID ids.NodeID, request []byte, responseHandler message.ResponseHandler) error {
 	if nodeID == ids.EmptyNodeID {
-		return fmt.Errorf("cannot send request to empty nodeID, nodeID=%s, requestLen=%d", nodeID, len(request))
+		return fmt.Errorf("%w, nodeID=%s, requestLen=%d", errEmptyNodeID, nodeID, len(request))
 	}
 
 	// If the context was cancelled, we can skip sending this request.

network/network_test.go

@@ -248,10 +248,8 @@ func TestRequestRequestsRoutingAndResponse(t *testing.T) {
 	}
 
 	// ensure empty nodeID is not allowed
-	require.ErrorContains(t,
-		net.SendAppRequest(context.Background(), ids.EmptyNodeID, []byte("hello there"), nil),
-		"cannot send request to empty nodeID",
-	)
+	err = net.SendAppRequest(context.Background(), ids.EmptyNodeID, []byte("hello there"), nil)
+	require.ErrorIs(t, err, errEmptyNodeID)
 }
 
 func TestAppRequestOnShutdown(t *testing.T) {
@@ -554,7 +552,8 @@ func TestNetworkPropagatesRequestHandlerError(t *testing.T) {
 	ctx := snowtest.Context(t, snowtest.CChainID)
 	clientNetwork, err := NewNetwork(ctx, sender, codecManager, 1, prometheus.NewRegistry())
 	require.NoError(t, err)
-	clientNetwork.SetRequestHandler(&testRequestHandler{err: errors.New("fail")}) // Return an error from the request handler
+	errTest := errors.New("test error")
+	clientNetwork.SetRequestHandler(&testRequestHandler{err: errTest}) // Return an error from the request handler
 
 	require.NoError(t, clientNetwork.Connected(context.Background(), nodeID, defaultPeerVersion))
 
@@ -565,7 +564,8 @@ func TestNetworkPropagatesRequestHandlerError(t *testing.T) {
 	require.NoError(t, err)
 
 	// Check that if the request handler returns an error, it is propagated as a fatal error.
-	require.ErrorContains(t, clientNetwork.AppRequest(context.Background(), nodeID, requestID, time.Now().Add(time.Second), requestMessage), "fail")
+	err = clientNetwork.AppRequest(context.Background(), nodeID, requestID, time.Now().Add(time.Second), requestMessage)
+	require.ErrorIs(t, err, errTest)
 }
 
 func TestNetworkAppRequestAfterShutdown(t *testing.T) {

plugin/evm/atomic/export_tx.go

@@ -36,10 +36,10 @@ var (
 	_                           secp256k1fx.UnsignedTx = (*UnsignedExportTx)(nil)
 	ErrExportNonAVAXInputBanff                         = errors.New("export input cannot contain non-AVAX in Banff")
 	ErrExportNonAVAXOutputBanff                        = errors.New("export output cannot contain non-AVAX in Banff")
+	ErrInsufficientFunds                               = errors.New("insufficient funds")
 	ErrInvalidNonce                                    = errors.New("invalid nonce")
 	ErrNoExportOutputs                                 = errors.New("tx has no export outputs")
 	errOverflowExport                                  = errors.New("overflow when computing export amount + txFee")
-	errInsufficientFunds                               = errors.New("insufficient funds")
 )
 
 // UnsignedExportTx is an unsigned ExportTx
@@ -323,14 +323,14 @@ func (utx *UnsignedExportTx) EVMStateTransfer(ctx *snow.Context, state StateDB)
 				uint256.NewInt(X2CRate.Uint64()),
 			)
 			if state.GetBalance(from.Address).Cmp(amount) < 0 {
-				return errInsufficientFunds
+				return ErrInsufficientFunds
 			}
 			state.SubBalance(from.Address, amount)
 		} else {
 			log.Debug("export_tx", "dest", utx.DestinationChain, "addr", from.Address, "amount", from.Amount, "assetID", from.AssetID)
 			amount := new(big.Int).SetUint64(from.Amount)
 			if state.GetBalanceMultiCoin(from.Address, common.Hash(from.AssetID)).Cmp(amount) < 0 {
-				return errInsufficientFunds
+				return ErrInsufficientFunds
 			}
 			state.SubBalanceMultiCoin(from.Address, common.Hash(from.AssetID), amount)
 		}
@@ -393,7 +393,7 @@ func getSpendableFunds(
 	}
 
 	if amount > 0 {
-		return nil, nil, errInsufficientFunds
+		return nil, nil, ErrInsufficientFunds
 	}
 
 	return inputs, signers, nil
@@ -487,7 +487,7 @@ func getSpendableAVAXWithFee(
 	}
 
 	if amount > 0 {
-		return nil, nil, errInsufficientFunds
+		return nil, nil, ErrInsufficientFunds
 	}
 
 	return inputs, signers, nil

plugin/evm/atomic/state/atomic_trie_iterator_test.go

@@ -100,5 +100,6 @@ func TestIteratorHandlesInvalidData(t *testing.T) {
 	require.NoError(err)
 	for iter.Next() {
 	}
-	require.Error(iter.Error())
+	err = iter.Error()
+	require.ErrorIs(err, errKeyLength)
 }

plugin/evm/atomic/tx.go

@@ -37,7 +37,7 @@ const (
 var (
 	ErrWrongNetworkID = errors.New("tx was issued with a different network ID")
 	ErrNilTx          = errors.New("tx is nil")
-	errNoValueOutput  = errors.New("output has no value")
+	ErrNoValueOutput  = errors.New("output has no value")
 	ErrNoValueInput   = errors.New("input has no value")
 	ErrNoGasUsed      = errors.New("no gas used")
 	errNilOutput      = errors.New("nil output")
@@ -97,7 +97,7 @@ func (out *EVMOutput) Verify() error {
 	case out == nil:
 		return errNilOutput
 	case out.Amount == 0:
-		return errNoValueOutput
+		return ErrNoValueOutput
 	case out.AssetID == ids.Empty:
 		return errEmptyAssetID
 	}