ArrayListのJUnitテストについて

Question

今、StudentクラスをタイプにもつArrayList<Student>のJUnitテストをしようとしているんですが、エラーメッセージに、期待値と、実際の値が異なると表示されます。目視で確認（エラーメッセージをメモ帳に張り付けて、期待値とどの箇所が間違っているかも何回も確認しましたが）するかぎり、完全に一致しています。にもかかわらず、エラーメッセージで値が異なると表示されてしまいます。よろしくお願いします。

java.lang.AssertionError: expected: java.lang.String<<ID>: a <PASSWORD>: a <NAME>: a <NATIONALITY>: a <ADDRESS>: a <UNIVERSITY>: a> but was: Actor.Student<<ID>: a <PASSWORD>: a <NAME>: a <NATIONALITY>: a <ADDRESS>: a <UNIVERSITY>: a>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:834)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:144)
	at junittest.AdministratorTest.listTest(AdministratorTest.java:72)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

//JUnitTestのクラスです
public class AdministratorTest {

	public ArrayList<Student> list;
	
	@Before
	public void setUp() {
		list = new ArrayList<Student>();
	}

@Test
public void listTest() {
	Administrator.add("a", "a", "a", "a", "a", "a", list);
	Administrator.add("2", "1", "2", "1", "2", "1", list);
	Administrator.add("3", "1", "1", "3", "1", "1", list);
	assertEquals("<ID>: " + "a" + " <PASSWORD>: " + "a"  + " <NAME>: " + "a" + " <NATIONALITY>: " + "a" + " <ADDRESS>: " + "a" + " <UNIVERSITY>: " + "a", list.get(0));
}

//Studentクラスです
public class Student implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	String name;
	String id;
	String password;
	String nationality;
	String address;
	String university;

public Student(String id, String password, String name, String nationality,String address, String university){
		this.id = id;
		this.password = password;
		this.name = name;
		this.nationality = nationality;
		this.address = address;
		this.university = university;
	}	

public String toString() {
		return "<ID>: " + this.id + " <PASSWORD>: " + this.password  + " <NAME>: " + this.name + " <NATIONALITY>: " + this.nationality + " <ADDRESS>: " + this.address + " <UNIVERSITY>: " + this.university;
	}


//Administratorクラスです
public static ArrayList<Student> list = new ArrayList<Student>();

public static void add(String id, String password, String name, 
String nationality,　String address, String univeristy, ArrayList<Student> list) {
		list.add(new Student(id, password, name, nationality, address, univeristy));
	}

Answer 1

assertEquals("<ID>: " + "a" + " <PASSWORD>: " + "a"  + " <NAME>: " + "a" + " <NATIONALITY>: " + "a" + " <ADDRESS>: " + "a" + " <UNIVERSITY>: " + "a", list.get(0));

あなたがここで比較しているのはStringとStudentです。equalsが成立するわけがありません。
第2引数をlist.get(0).toString()とでもしないと。

Comments

[退会済みユーザー]

型が違うとequalsが成立しないんですね。list.get(0).toString()と修正したら、上手くtrueになりました。
ありがとうございました。

[swordone]

内容が同じArrayListとLinkedListのように型が違ってもequalsが成立するケースはありますが、Stringとequalsが成立するのは同じ文字列を表すStringのみです。