accounts/abi/bind: check SendTransaction error in tests (ethereum#30349)

In few tests the returned error from `SendTransaction` is not being
checked. This PR checks the returned err in tests.

Returning errors also revealed tx in `TestCommitReturnValue` is not
actually being sent, and returns err ` only replay-protected (EIP-155)
transactions allowed over RPC`. Fixed the transaction by using the
`testTx` function.

accounts/abi/bind/backends/simulated_test.go

@@ -1376,29 +1376,38 @@ func TestForkResendTx(t *testing.T) {
 	defer sim.Close()
 	// 1.
 	parent := sim.blockchain.CurrentBlock()
+
 	// 2.
 	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
 	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
-
 	_tx := types.NewTransaction(0, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
-	tx, _ := types.SignTx(_tx, types.HomesteadSigner{}, testKey)
-	sim.SendTransaction(context.Background(), tx)
+	tx, err := types.SignTx(_tx, types.HomesteadSigner{}, testKey)
+	if err != nil {
+		t.Fatalf("could not sign transaction: %v", err)
+	}
+	if err = sim.SendTransaction(context.Background(), tx);  err != nil {
+		t.Fatalf("sending transaction: %v", err)
+	}
 	sim.Commit()
+
 	// 3.
 	receipt, _ := sim.TransactionReceipt(context.Background(), tx.Hash())
 	if h := receipt.BlockNumber.Uint64(); h != 1 {
 		t.Errorf("TX included in wrong block: %d", h)
 	}
+
 	// 4.
 	if err := sim.Fork(context.Background(), parent.Hash()); err != nil {
 		t.Errorf("forking: %v", err)
 	}
+
 	// 5.
 	sim.Commit()
 	if err := sim.SendTransaction(context.Background(), tx); err != nil {
 		t.Errorf("sending transaction: %v", err)
 	}
 	sim.Commit()
+
 	// 6.
 	receipt, _ = sim.TransactionReceipt(context.Background(), tx.Hash())
 	if h := receipt.BlockNumber.Uint64(); h != 2 {
@@ -1425,7 +1434,10 @@ func TestCommitReturnValue(t *testing.T) {
 	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
 	_tx := types.NewTransaction(0, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	tx, _ := types.SignTx(_tx, types.HomesteadSigner{}, testKey)
-	sim.SendTransaction(context.Background(), tx)
+	if err := sim.SendTransaction(context.Background(), tx); err != nil {
+		t.Errorf("sending transaction: %v", err)
+	}
+
 	h2 := sim.Commit()
 
 	// Create another block in the original chain

accounts/abi/bind/util_test.go

@@ -86,7 +86,9 @@ func TestWaitDeployed(t *testing.T) {
 		}()
 
 		// Send and mine the transaction.
-		backend.SendTransaction(ctx, tx)
+		if err := backend.SendTransaction(ctx, tx); err != nil {
+			t.Errorf("test %q: failed to send transaction: %v", name, err)
+		}
 		backend.Commit()
 
 		select {
@@ -125,7 +127,9 @@ func TestWaitDeployedCornerCases(t *testing.T) {
 	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	backend.SendTransaction(ctx, tx)
+	if err := backend.SendTransaction(ctx, tx); err != nil {
+		t.Errorf("failed to send transaction: %q", err)
+	}
 	backend.Commit()
 	notContractCreation := errors.New("tx is not contract creation")
 	if _, err := bind.WaitDeployed(ctx, backend, tx); err.Error() != notContractCreation.Error() {
@@ -143,6 +147,8 @@ func TestWaitDeployedCornerCases(t *testing.T) {
 		}
 	}()
 
-	backend.SendTransaction(ctx, tx)
+	if err := backend.SendTransaction(ctx, tx); err != nil {
+		t.Errorf("failed to send transaction: %q", err)
+	}
 	cancel()
 }