public function testInvocation()
{
$invoker = new Invoker();
$receiver = new Receiver();
$invoker->setCommand(new HelloCommand($receiver));
$invoker->run();
$this->assertEquals($receiver->getOutput(), 'Hello World');
}
public function testInvocation()
{
$this->invoker->setCommand(new HelloCommand($this->receiver));
$this->invoker->run();
$this->assertEquals($this->receiver->getOutput(), 'Hello World');
$messageDateCommand = new AddMessageDateCommand($this->receiver);
$messageDateCommand->execute();
$this->invoker->run();
$this->assertEquals($this->receiver->getOutput(), "Hello World\nHello World [" . date('Y-m-d') . ']');
$messageDateCommand->undo();
$this->invoker->run();
$this->assertEquals($this->receiver->getOutput(), "Hello World\nHello World [" . date('Y-m-d') . "]\nHello World");
}