signer: run tests in parallel (#28536)

marks tests as parallel-safe in package signer

signer/fourbyte/abi_test.go

@@ -52,6 +52,7 @@ func verify(t *testing.T, jsondata, calldata string, exp []interface{}) {
 }
 
 func TestNewUnpacker(t *testing.T) {
+	t.Parallel()
 	type unpackTest struct {
 		jsondata string
 		calldata string
@@ -97,6 +98,7 @@ func TestNewUnpacker(t *testing.T) {
 }
 
 func TestCalldataDecoding(t *testing.T) {
+	t.Parallel()
 	// send(uint256)                              : a52c101e
 	// compareAndApprove(address,uint256,uint256) : 751e1079
 	// issue(address[],uint256)                   : 42958b54
@@ -159,6 +161,7 @@ func TestCalldataDecoding(t *testing.T) {
 }
 
 func TestMaliciousABIStrings(t *testing.T) {
+	t.Parallel()
 	tests := []string{
 		"func(uint256,uint256,[]uint256)",
 		"func(uint256,uint256,uint256,)",

signer/fourbyte/fourbyte_test.go

@@ -17,8 +17,8 @@
 package fourbyte
 
 import (
+	"encoding/json"
 	"fmt"
-	"strings"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
@@ -27,18 +27,19 @@ import (
 
 // Tests that all the selectors contained in the 4byte database are valid.
 func TestEmbeddedDatabase(t *testing.T) {
+	t.Parallel()
 	db, err := New()
 	if err != nil {
 		t.Fatal(err)
 	}
+	var abistruct abi.ABI
 	for id, selector := range db.embedded {
 		abistring, err := parseSelector(selector)
 		if err != nil {
 			t.Errorf("Failed to convert selector to ABI: %v", err)
 			continue
 		}
-		abistruct, err := abi.JSON(strings.NewReader(string(abistring)))
-		if err != nil {
+		if err := json.Unmarshal(abistring, &abistruct); err != nil {
 			t.Errorf("Failed to parse ABI: %v", err)
 			continue
 		}
@@ -55,6 +56,7 @@ func TestEmbeddedDatabase(t *testing.T) {
 
 // Tests that custom 4byte datasets can be handled too.
 func TestCustomDatabase(t *testing.T) {
+	t.Parallel()
 	// Create a new custom 4byte database with no embedded component
 	tmpdir := t.TempDir()
 	filename := fmt.Sprintf("%s/4byte_custom.json", tmpdir)

signer/fourbyte/validation_test.go

@@ -73,6 +73,7 @@ type txtestcase struct {
 }
 
 func TestTransactionValidation(t *testing.T) {
+	t.Parallel()
 	var (
 		// use empty db, there are other tests for the abi-specific stuff
 		db = newEmpty()