[#321] adm/test: Check wallet correctness in parallel

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/generate_test.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
+	"sync"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/innerring"
@@ -71,11 +72,16 @@ func TestGenerateAlphabet(t *testing.T) {
 	buf.WriteString(testContractPassword + "\r")
 	require.NoError(t, generateAlphabetCreds(generateAlphabetCmd, nil))
 
+	var wg sync.WaitGroup
 	for i := uint64(0); i < size; i++ {
+		i := i
+		go func() {
+			defer wg.Done()
 			p := filepath.Join(walletDir, innerring.GlagoliticLetter(i).String()+".json")
 			w, err := wallet.NewWalletFromFile(p)
 			require.NoError(t, err, "wallet doesn't exist")
 			require.Equal(t, 3, len(w.Accounts), "not all accounts were created")
+
 			for _, a := range w.Accounts {
 				err := a.Decrypt(strconv.FormatUint(i, 10), keys.NEP2ScryptParams())
 				require.NoError(t, err, "can't decrypt account")
@@ -88,7 +94,9 @@ func TestGenerateAlphabet(t *testing.T) {
 					require.Equal(t, singleAccountName, a.Label)
 				}
 			}
+		}()
 	}
+	wg.Wait()
 
 	t.Run("check contract group wallet", func(t *testing.T) {
 		p := filepath.Join(walletDir, contractWalletFilename)