package soundsystem;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class CDPlayer implements MediaPlayer {
    private CompactDisc cd;

    @Autowired
    public CDPlayer(CompactDisc cd) {
        this.cd = cd;
    }

    @Override
    public void play() {
        cd.play();
    }
}
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package soundsystem;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
//@ComponentScan
public class CDPlayerConfig {
}

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package soundsystem;
public interface CompactDisc {
    void play();
}
--------------------------------------------------------------------------------------------------------------------------
package soundsystem;
public interface MediaPlayer {
    void play();
}
--------------------------------------------------------------------------------------------------------------------------
package soundsystem;
import org.springframework.stereotype.Component;
@Component
public class SgtPeppers implements CompactDisc {
    private String title = "Sgt. Pepper's Lonely Hearts Club Band";
    private String artist = "The Beatles";
    @Override
    public void play() {
        System.out.println("Odtwarzam utwór " + title + " artysty " + artist);
    }
}

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
  <!--<context:annotation-config />-->
  <context:component-scan base-package="soundsystem"/>

</beans>
--------------------------------------------------------------------------------------------------------------------------
package soundsystem;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import soundsystem.CDPlayerConfig;
import soundsystem.CompactDisc;
import static org.junit.Assert.*;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = CDPlayerConfig.class)//konfiguracja kontekstu ma zostac wczytana z tej klasy
public class CDPlayerTest {
    @Autowired
    private CompactDisc cd;

    @Test
    public void cdShouldBeNull() {
        assertNotNull(cd);
    }
}