libs/rand: remove custom seed function (#7473)

libs/events/events_test.go

@@ -3,6 +3,7 @@ package events
 import (
 	"context"
 	"fmt"
+	"math/rand"
 	"testing"
 	"time"
 
@@ -10,7 +11,6 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tendermint/libs/rand"
 )
 
 // TestAddListenerForEventFireOnce sets up an EventSwitch, subscribes a single
@@ -469,7 +469,7 @@ func TestRemoveListenersAsync(t *testing.T) {
 	// collect received events for event2
 	go sumReceivedNumbers(numbers2, doneSum2)
 	addListenersStress := func() {
-		r1 := rand.NewRand()
+		r1 := rand.New(rand.NewSource(time.Now().Unix()))
 		r1.Seed(time.Now().UnixNano())
 		for k := uint16(0); k < 400; k++ {
 			listenerNumber := r1.Intn(100) + 3
@@ -480,7 +480,7 @@ func TestRemoveListenersAsync(t *testing.T) {
 		}
 	}
 	removeListenersStress := func() {
-		r2 := rand.NewRand()
+		r2 := rand.New(rand.NewSource(time.Now().Unix()))
 		r2.Seed(time.Now().UnixNano())
 		for k := uint16(0); k < 80; k++ {
 			listenerNumber := r2.Intn(100) + 3