*: fix tests data race

s.Shutdown() does not wait for all goroutines of the node server to
stop, which causes logs to attempt to write after the test has ended.

Signed-off-by: Ekaterina Pavlova <[email protected]>

pkg/network/server_test.go

@@ -392,6 +392,7 @@ func startWithCleanup(t *testing.T, s *Server) {
 	go s.Start()
 	t.Cleanup(func() {
 		s.Shutdown()
+		require.Eventually(t, func() bool { return s.log.Sync() == nil }, 2*time.Second, time.Millisecond*500)
 	})
 }