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~~~ package command import ( "testing" ) func TestCommand(t *testing.T) { invoker := NewInvoker() concomA := NewConcreteCommandA() receA := NewReceiverA() concomA.SetReceiver(*receA) invoker.AddCommand(concomA) concomB := NewConcreteCommandB() receB := NewReceiverB() concomB.SetReceiver(*receB) invoker.AddCommand(concomB) invoker.ExecuteCommand() } ~~~