Update TestMain(): do not call os.Exit() explicitly (#8046)

* update workspace

* update testmain

beacon-chain/sync/initial-sync/initial_sync_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
-	"os"
 	"sync"
 	"testing"
 	"time"
@@ -53,27 +52,24 @@ type peerData struct {
 }
 
 func TestMain(m *testing.M) {
-	run := func() int {
-		logrus.SetLevel(logrus.DebugLevel)
-		logrus.SetOutput(ioutil.Discard)
+	logrus.SetLevel(logrus.DebugLevel)
+	logrus.SetOutput(ioutil.Discard)
 
-		resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{
-			EnablePeerScorer: true,
-		})
-		defer resetCfg()
+	resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{
+		EnablePeerScorer: true,
+	})
+	defer resetCfg()
 
-		resetFlags := flags.Get()
-		flags.Init(&flags.GlobalFlags{
-			BlockBatchLimit:            64,
-			BlockBatchLimitBurstFactor: 10,
-		})
-		defer func() {
-			flags.Init(resetFlags)
-		}()
+	resetFlags := flags.Get()
+	flags.Init(&flags.GlobalFlags{
+		BlockBatchLimit:            64,
+		BlockBatchLimitBurstFactor: 10,
+	})
+	defer func() {
+		flags.Init(resetFlags)
+	}()
 
-		return m.Run()
-	}
-	os.Exit(run())
+	m.Run()
 }
 
 func initializeTestServices(t *testing.T, blocks []uint64, peers []*peerData) (*mock.ChainService, *p2pt.TestP2P, db.Database) {