如何使用junit ExpectedException？

Question

我正在努力ExpectedExceptions为JUnit 工作.我已经尝试了这个:

public class ExpectedTest {

    @Rule
    public ExpectedException thrown = ExpectedException.none();


    @Test
    public void test() {
        thrown.expect(NullPointerException.class);
        throw new NullPointerException();
    }

}

这引起了我以下异常:

java.lang.NoClassDefFoundError:org/hamcrest/TypeSafeMatcher,位于java.security.ClassLoader.defineClass(ClassLoader.java:800)的java.lang.ClassLoader.defineClass1(Native Method),位于java.security.SecureClassLoader.defineClass(SecureClassLoader.java) :142)java.net.URLClassLoader.accessClass(URLClassLoader.java:449)java.net.URLClassLoader.access $ 100(URLClassLoader.java:71)java.net.URLClassLoader $ 1.run(URLClassLoader.java:361)在java.net.URLClassLoader $ 1.run(URLClassLoader.java:355)java.security.AccessController.doPrivileged(Native Method),java.net.URLClassLoader.findClass(URLClassLoader.java:354),位于java.lang.ClassLoader.位于org.junit.matchers.JUnitMatchers.isThrowable的java.lang.ClassLoader.loadClass(ClassLoader.java:358)sun.misc.Launcher $ AppClassLoader.loadClass(Launcher.java:309)的loadClass(ClassLoader.java:425) (JUnitMatchers.java:103)在org.junit.rules.ExpectedException的org.junit.rules.ExpectedExceptionMatcherBuilder.build(ExpectedExceptionMatcherBuilder.java:27).handleOception(ExpectedException.java:198)org.junit.rules.ExpectedException.access $ 500(ExpectedException.java:85)org.junit.rules.ExpectedException $ ExpectedExceptionStatement.evaluate(ExpectedException.java:177)org.junit.在org.junit的org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)的org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)上的rules.RunRules.evaluate(RunRules.java:20) .runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)org.junit.runners.ParentRunner $ 3.run(ParentRunner.java:238)at org.junit.runners.ParentRunner $ 1.schedule(ParentRunner.java:63)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)org.junit.runners.ParentRunner.access $ 000(ParentRunner.java:53)org.junit.runners.ParentRunner $ 2.evaluate(ParentRunner.java: 229)在org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)的org.junit.runners.ParentRunner.run(ParentRunner.java:309)在org.eclipse上的org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)位于org.eclipse.jdt.internal的org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)的.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) .junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)由java.net中的java.net.URLClassLoader $ 1.run(URLClassLoader.java:366)引起的java.lang.ClassNotFoundException:org.hamcrest.TypeSafeMatcher. URLClassLoader $ 1.run(URLClassLoader.java:355)在java.security.AccessController.doPrivileged(Native Method)java.net.URLClassLoader.findClass(URLClassLoader.java:354)java.lang.ClassLoader.loadClass(ClassLoader.java) :425)at sun.misc.Launcher $ AppClassLoader.loadClass(Launcher.java:308)at java.lang.ClassLoader.loadClass(ClassLoader.java:358)... 33更多

当我这样做时:

public class ExpectedTest {

    @Rule
    public ExpectedException thrown;

    @Before
    public void setup() {
        thrown = ExpectedException.none();
    }

    @Test
    public void test() {
        thrown.expect(NullPointerException.class);
        throw new NullPointerException();
    }

}

我得到一个简单的NullPointerException!我究竟做错了什么？

Answer 1

java.lang.NoClassDefFoundError: org/hamcrest/TypeSafeMatcher建议您应确保 hamcrest-core 位于运行时类路径上，如果缺少则添加它