Junit4: @RunWith(MyCustomRunner.class) - IllegalAccessException

你好，

我尝试实现几种类型的“自定义运行器”以熟悉 JUnit 自定义运行器的概念，
但他们中的每一个都给出了相同的例外，我太愚蠢了，无法弄清楚原因。

我编写了以下测试：

@RunWith(MyYetAnotherRunner.class)
public class BestPracticesForUsingJUnit_OwnRunner2 {
    <strong i="9">@Test</strong>
    public void one() {
    }
    <strong i="10">@Test</strong>
    public void two() {
    }
    <strong i="11">@Test</strong>
    public void three() {
    }
}

“自定义跑步者”类如下：

class MyYetAnotherRunner extends Runner {
    private Class<?> testClass;
    public MyYetAnotherRunner(Class<?> testClass) {
        super();
        this.testClass = testClass;
    }
    <strong i="15">@Override</strong>
    public Description getDescription() {
        return Description.createTestDescription(testClass, "My runner description");
    }
    <strong i="16">@Override</strong>
    public void run(RunNotifier notifier) {
        System.out.println("running the tests from MyRunner: " + testClass);
        try {
            Object testObject = testClass.newInstance();
            for (Method method : testClass.getMethods()) {
                if (method.isAnnotationPresent(Test.class)) {
                    notifier.fireTestStarted(Description.createTestDescription(testClass, method.getName()));
                    method.invoke(testObject);
                    notifier.fireTestFinished(Description.createTestDescription(testClass, method.getName()));
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

我也通过从BlockJUnit4ClassRunner扩展来尝试运气，但也无济于事：

class MyRandomBlockJUnit4ClassRunner extends BlockJUnit4ClassRunner {
    public MyRandomBlockJUnit4ClassRunner(Class<?> klass) throws InitializationError {
        super(klass);
    }
    protected java.util.List<org.junit.runners.model.FrameworkMethod> computeTestMethods() {
        java.util.List<org.junit.runners.model.FrameworkMethod> methods = super.computeTestMethods();
        Collections.shuffle(methods);
        return methods;
    }
}

我通过“右键单击”测试类BestPracticesForUsingJUnit_OwnRunner2 -> Run As -> JUnit Test 在 Eclipse 中运行测试。

在每种情况下，错误堆栈跟踪是：

java.lang.IllegalAccessException: Class org.junit.internal.builders.AnnotatedBuilder can not access a member of class 
part2.ch9.RandomBlockJUnit4ClassRunner with modifiers "public"
    at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102)
    at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:296)
    at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:288)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:413)
    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
    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.JUnit4TestLoader.createUnfilteredTest(JUnit4TestLoader.java:87)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:73)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:46)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:522)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

奇怪的是使用预先实现的Parameter.class -JUnit-Test-Runner 一切正常。

怎么了？

它与日食有关吗？