Spring framework testing context

HearingInterpreter.java

@Service
public class HearingInterpreter {

	private final WordProducer wordProducer;

	HearingInterpreter(WordProducer wordProducer) {
		this.wordProducer = wordProducer;
	}

	public String whatIHeard() {
		String word = wordProducer.getWord();
		System.out.println(word);
		return word;
	}
}

HearingInterpreterTest.java

public class HearingInterpreterTest {

	HearingInterpreter hearingInterpreter;

	@Before
	public void setUp() {
		hearingInterpreter = new HearingInterpreter(new LaurelWordProducer());
	}

	@Test
	public void whatIHeard() {
		String word = hearingInterpreter.whatIHeard();
		assertThat(word).isEqualTo("Laurel");
	}
}

LaurelWordProducer.java

@Component
@Primary
public class LaurelWordProducer implements WordProducer {
	@Override
	public String getWord() {
		return "Laurel";
	}
}

WordProducer.java

public interface WordProducer {
	String getWord();
}

YannyWordProducer.java

@Component
public class YannyWordProducer implements WordProducer {
	@Override
	public String getWord() {
		return "Yanny";
	}
}