rpc: fix (*Client).BalanceOf

Add missing argument and write tests.

pkg/rpc/client/nep5.go

@@ -78,8 +78,11 @@ func (c *Client) NEP5TotalSupply(tokenHash util.Uint160) (int64, error) {
 }
 
 // NEP5BalanceOf invokes `balanceOf` NEP5 method on a specified contract.
-func (c *Client) NEP5BalanceOf(tokenHash util.Uint160) (int64, error) {
-	result, err := c.InvokeFunction(tokenHash, "balanceOf", []smartcontract.Parameter{}, nil)
+func (c *Client) NEP5BalanceOf(tokenHash, acc util.Uint160) (int64, error) {
+	result, err := c.InvokeFunction(tokenHash, "balanceOf", []smartcontract.Parameter{{
+		Type:  smartcontract.Hash160Type,
+		Value: acc,
+	}}, nil)
 	if err != nil {
 		return 0, err
 	} else if result.State != "HALT" || len(result.Stack) == 0 {

pkg/rpc/server/client_test.go

@@ -0,0 +1,59 @@
+package server
+
+import (
+	"context"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
+	"github.com/nspcc-dev/neo-go/pkg/internal/testchain"
+	"github.com/nspcc-dev/neo-go/pkg/rpc/client"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/stretchr/testify/require"
+)
+
+func TestClient_NEP5(t *testing.T) {
+	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
+	defer chain.Close()
+	defer rpcSrv.Shutdown()
+
+	c, err := client.New(context.Background(), httpSrv.URL, client.Options{Network: netmode.UnitTestNet})
+	require.NoError(t, err)
+
+	h, err := util.Uint160DecodeStringLE(testContractHash)
+	require.NoError(t, err)
+
+	t.Run("Decimals", func(t *testing.T) {
+		d, err := c.NEP5Decimals(h)
+		require.NoError(t, err)
+		require.EqualValues(t, 2, d)
+	})
+	t.Run("TotalSupply", func(t *testing.T) {
+		s, err := c.NEP5TotalSupply(h)
+		require.NoError(t, err)
+		require.EqualValues(t, 1_000_000, s)
+	})
+	t.Run("Name", func(t *testing.T) {
+		name, err := c.NEP5Name(h)
+		require.NoError(t, err)
+		require.Equal(t, "Rubl", name)
+	})
+	t.Run("Symbol", func(t *testing.T) {
+		sym, err := c.NEP5Symbol(h)
+		require.NoError(t, err)
+		require.Equal(t, "RUB", sym)
+	})
+	t.Run("TokenInfo", func(t *testing.T) {
+		tok, err := c.NEP5TokenInfo(h)
+		require.NoError(t, err)
+		require.Equal(t, h, tok.Hash)
+		require.Equal(t, "Rubl", tok.Name)
+		require.Equal(t, "RUB", tok.Symbol)
+		require.EqualValues(t, 2, tok.Decimals)
+	})
+	t.Run("BalanceOf", func(t *testing.T) {
+		acc := testchain.PrivateKeyByID(0).GetScriptHash()
+		b, err := c.NEP5BalanceOf(h, acc)
+		require.NoError(t, err)
+		require.EqualValues(t, 877, b)
+	})
+}