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public class JazzBandTest {
public void bandCreatesMusicianWithAccessToBandSetList() {
List setList = Arrays.asList("Donna Lee", "Dig");
JazzBand theBop5 = new JazzBand(setList);
JazzBand.Musician tom = theBop5.createMusician();
assertTrue(setList == tom.getBandSetList());
public class JazzBand {
private List setList;
public JazzBand(List setList) {
this.setList = setList;
public Musician createMusician() {
return new Musician();
public class Musician {
private Musician() {}
public List getBandSetList() {
return setList;
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