JUnit 测试用例中的 InitializationError

Question

我使用eclipse，我写了以下代码：

package JUnitTestPackage;

import static org.junit.Assert.*;

import org.junit.Ignore;
import org.junit.Test;

import JUnit_Test.BankAccount;

public class BankAccountTest {

    @Test
    public void testDeposit() {
        BankAccount account = new BankAccount();
        account.deposit(1000);
        account.deposit(100);
        assertTrue("Test Deposit", 1100 == account.getBalance());
    }

    @Test
    @Ignore
    public void testWithdraw() {
        fail("Not yet implemented");
    }

    @Test
    @Ignore
    public void testGetBalance() {
        fail("Not yet implemented");
    }

}

所以，我是第一次使用 Eclipse 和 JUnit。因此，代码只是为了了解 JUnit 的工作原理。但是当我单击 Run as -> JUnit Test Case 时，我会收到消息 initializationError。我双击该错误，并收到以下消息：

我的失败跟踪如下所示：

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassNotFoundException: org.hamcrest.SelfDescribing
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 25 more

从之前的帖子 (Eclipse JUnit - possible causes of seeing "initializationError" in Eclipse window) 中，我遵循了一些建议，但没有成功。例如，我尝试了以下步骤：

1. I have added harmcrest to my library
2. Go to Project -> Clean

我希望有人可以帮助我。

最好的问候，

Answer 1

在项目属性“添加库”上打开 Java 构建路径，然后添加 JUnit 4 库。您不需要直接添加任何 JUnit jar。