Remove sleeps in test

Sleeping for a microsecond on Windows actually takes 10ms. This caused
the test to never finish. Instead use channel to ensure the two
goroutines start working at the same time and remove the sleeps.

conn_test.go

@@ -545,6 +545,7 @@ func TestListenNotifyWhileBusyIsSafe(t *testing.T) {
 
 	listenerDone := make(chan bool)
 	notifierDone := make(chan bool)
+	listening := make(chan bool)
 	go func() {
 		conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
 		defer closeConn(t, conn)
@@ -553,6 +554,7 @@ func TestListenNotifyWhileBusyIsSafe(t *testing.T) {
 		}()
 
 		mustExec(t, conn, "listen busysafe")
+		listening <- true
 
 		for i := 0; i < 5000; i++ {
 			var sum int32
@@ -588,8 +590,6 @@ func TestListenNotifyWhileBusyIsSafe(t *testing.T) {
 				t.Errorf("Wrong number of rows: %v", rowCount)
 				return
 			}
-
-			time.Sleep(1 * time.Microsecond)
 		}
 	}()
 
@@ -600,9 +600,10 @@ func TestListenNotifyWhileBusyIsSafe(t *testing.T) {
 			notifierDone <- true
 		}()
 
+		<-listening
+
 		for i := 0; i < 100000; i++ {
 			mustExec(t, conn, "notify busysafe, 'hello'")
-			time.Sleep(1 * time.Microsecond)
 		}
 	}()