Question

我正在尝试使用ExpectedExceptions来使用JUnit。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();
    }

}

引起了以下异常：

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

当我这样做的时候：

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！我做错了什么？

Answer 1

java.lang.NoClassDefFoundError: org/hamcrest/TypeSafeMatcher建议你应该确保hamcrest-core在运行时类路径上，或者如果缺少它就添加它

Answer 2

您需要以下依赖

    <dependency>
        <groupId>org.hamcrest</groupId>
        <artifactId>hamcrest-core</artifactId>
        <version>1.3</version>
        <scope>test</scope>
    </dependency>

Answer 3

在应该抛出异常的测试中尝试这个：

@Test(expected = NullPointerException.class)

如何使用junit ExpectedException？

3 个答案: