Apply suggestions from code review

crypto/hd/algorithm_test.go

@@ -31,17 +31,18 @@ func init() {
 	enccodec.RegisterInterfaces(interfaceRegistry)
 }
 
-const mnemonic = "picnic rent average infant boat squirrel federal assault mercy purity very motor fossil wheel verify upset box fresh horse vivid copy predict square regret"
+const (
+	mnemonic = "picnic rent average infant boat squirrel federal assault mercy purity very motor fossil wheel verify upset box fresh horse vivid copy predict square regret"
 
-func TestKeyring(t *testing.T) {
 	// hdWalletFixEnv defines whether the standard (correct) bip39
 	// derivation path was used, or if derivation was affected by
 	// https://github.com/btcsuite/btcutil/issues/172
-	const hdWalletFixEnv = "GO_ETHEREUM_HDWALLET_FIX_ISSUE_179"
-	os.Setenv(hdWalletFixEnv, "true")
+	hdWalletFixEnv = "GO_ETHEREUM_HDWALLET_FIX_ISSUE_179"
+)
+
+func TestKeyring(t *testing.T) {
 	dir := t.TempDir()
 	mockIn := strings.NewReader("")
-
 	kr, err := keyring.New("ethermint", keyring.BackendTest, dir, mockIn, TestCodec, EthSecp256k1Option())
 	require.NoError(t, err)
 
@@ -73,7 +74,9 @@ func TestKeyring(t *testing.T) {
 	privkey := EthSecp256k1.Generate()(bz)
 	addr := common.BytesToAddress(privkey.PubKey().Address().Bytes())
 
+	os.Setenv(hdWalletFixEnv, "true")
 	wallet, err := hdwallet.NewFromMnemonic(mnemonic)
+	os.Setenv(hdWalletFixEnv, "")
 	require.NoError(t, err)
 
 	path := hdwallet.MustParseDerivationPath(hdPath)