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我一直很困惑如何让我的代码使用graphwalker遍历基于模型的测试图。

我使用 yEd 构建了一个图形 (e2e.graphml)，并将该文件复制到我在 Eclipse 中的项目中。我还为每个边和顶点创建了一个包含方法的接口。接下来，我为我的接口创建了一个实现类，其中我提供了在遍历该边或顶点时需要执行的少量功能。接下来，我执行了如下功能测试：

@Test()
public void runFunctionalTest() throws IOException {
    Context context = new MyClass();
    TestBuilder builder = new TestBuilder().setContext(context);
    builder.setModel(MODEL_PATH);
    context.setPathGenerator(new RandomPath(newReachedVertex("v_Success")));
    builder.setStart("v_Start");
    builder.execute();
}

在这里，MODEL_PATH 是我用来提供 yEd 文件的位置或路径的变量。每当我运行此测试时，都不会遍历任何边或顶点，并且错误日志如下：

java.lang.NullPointerException
at org.graphwalker.core.condition.ReachedStopConditionBase.validate(ReachedStopConditionBase.java:52)
at org.graphwalker.core.condition.ReachedStopConditionBase.setContext(ReachedStopConditionBase.java:48)
at org.graphwalker.core.generator.PathGeneratorBase.setContext(PathGeneratorBase.java:49)
at org.graphwalker.core.machine.ExecutionContext.setPathGenerator(ExecutionContext.java:179)
at gw.MyClass.runFunctionalTest(MyClass.java:277)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:343)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:305)
at org.testng.SuiteRunner.run(SuiteRunner.java:254)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)

它在生成路径时出错。如果我以错误的方式实施某些事情，请提供帮助。谢谢！！

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